Christophe Cloquet

@article{LeRoux_etal2023,

title = {Lead from Notre-Dame fire plume caught 15 km from Paris},

author = {G. Le Roux and O. Masson and C. Cloquet and M. J. Tavella and M. Beguin-Leprieur and O. Saunier and D. Baqu\'{e} and T. Camboulive and J. Berger and T. Aigouy and F. Maube and S. Baron and S. Ayrault and M. L’H\'{e}ritier},

doi = {10.1021/acsearthspacechem.2c00321},

year  = {2023},

date = {2023-01-01},

journal = {ACS Earth and Space Chemistry},

volume = {7},

pages = {310--314},

abstract = {Thanks to the use of filters collected daily in the west of Paris, we confirm the passage of the lead-laden plume following the fire on the roof and spire of Notre-Dame Cathedral in April 2019. The measured concentrations on the filter (Pb = 1.4 $mu$g m−3), scanning electron microscopy and Hysplit simulation, correspond to an estimate of a few hundred kilograms of lead that would have been volatilized and then oxidized in the form of micronic and submicronic aerosols. The concentrations found in the plume are, however, much lower than those found in the environment in the 1980s and 1990s but are 100 times higher than those found in times prior to and after the fire. The isotopic signature of the plume is almost identical to that of the fine Pb dust found inside the Notre-Dame building. It is different from the isotopic signature of the Parisian atmosphere before and after the fire, but it is similar to that of the atmospheric Pb legacy recorded by peat cores over the last 300 years in France. The presence of very fine lead-bearing particles makes them potentially transportable over long distances after large urban fires. Our study shows the value of daily aerosol sampling to retrospectively trace the plumes of air pollutants from industrial accidents but also from historical monument fires such as Notre-Dame in 2019.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Jegal_etal2022,

title = {Characterisation of reference materials for In situ Rb-Sr dating by LA-ICP-MS/MS},

author = {Y. Jegal and C. Zimmermann and L. Reisberg and D. Yeghicheyan and C. Cloquet and C. Peiffert and M. Gerardin and E. Deloule and J. Mercadier},

doi = {10.1111/ggr.12456},

year  = {2022},

date = {2022-01-01},

journal = {Geostandards and Geoanalytical Research},

volume = {46},

number = {4},

pages = {645--671},

abstract = {We present Rb and Sr mass fraction and 87Sr/86Sr isotope ratio measurement results for four reference materials (RMs) obtained from the Service d’Analyse des Roches et des Min\'{e}raux (SARM), Nancy, France: Mica-Mg, Mica-Fe, GL-O and FK-N. These four RMs have different chemical compositions spanning the range of those of most K-bearing feldspars and micas, making them potential calibration materials for in situ Rb-Sr dating of natural minerals by LA-ICP-MS/MS. Selected grains and flakes from the four RMs present variable degrees of heterogeneity observable by SEM-EDS and EPMA imaging, and chemical mapping. This heterogeneity is mainly related to inclusions of minerals within flakes and grains and to chemical substitutions linked to crystallographic control and alteration processes. The Mica-Mg RM is the least affected. The powders available at the SARM were analysed by ID-TIMS (87Sr/86Sr and Sr) and ID-MC-ICP-MS (Rb) after digestion and separation. The mean 87Rb/86Sr ratios are 155.6thinspacetextpmthinspace4.7% (2s, as for other RMs) for Mica-Mg, 1815thinspacetextpmthinspace14% for Mica-Fe, 36.2thinspacetextpmthinspace11% for GL-O and 69.9thinspacetextpmthinspace5.9% for FK-N. The mean 87Sr/86Sr ratios are 1.8622thinspacetextpmthinspace0.36% (2s, as for other RMs) for Mica-Mg, 7.99thinspacetextpmthinspace13% for Mica-Fe, 0.75305thinspacetextpmthinspace0.12% for GL-O, and 1.2114thinspacetextpmthinspace0.17% for FK-N. The four RMs each show dispersion in 87Sr/86Sr and Rb and Sr mass fractions, to degrees that differ between RMs and that reflect the heterogeneity of their original crystals. The most heterogeneous RMs are GL-O and Mica-Fe. The calculated mean Rb-Sr isotopic ages are 521thinspacetextpmthinspace24 Ma for Mica-Mg, 287thinspacetextpmthinspace55 Ma for Mica-Fe, 89.2thinspacetextpmthinspace9.9 Ma for GL-O and 512thinspacetextpmthinspace30 Ma for FK-N. The proposed age for Mica-Fe may be unreliable due to the elevated dispersion of individual analysis linked to the highly radiogenic composition of the biotite and to the presence of numerous mineral inclusions. We recommend use of these proposed working values of 87Sr/86Sr and 87Rb/86Sr ratios and associated uncertainties when using the four RMs for in situ Rb-Sr dating by LA-ICP-MS/MS. The availability of these four well-characterised RMs will allow progress in the development and application of the Rb-Sr dating approach by LA-ICP-MS/MS.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{LeMeur_etal2021,

title = {Typo-technological, elemental and lead isotopic characterization and interpretation of {D}^ong Sơn miniature drums},

author = {C. Le Meur and M. Cadet and N. V. Doan and D. N. Trien and C. Cloquet and P. Dillmann and A. Thote and T. O. Pryce},

doi = {10.1016/j.jasrep.2021.103017},

year  = {2021},

date = {2021-01-01},

journal = {Journal of Archaeological Science: Reports},

volume = {38},

pages = {103017},

abstract = {Copper-base drums are among the most iconic artefacts of mid-late 1st millennium BC Southeast Asia and southern China, and more specifically of the Vietnamese {D}ˆong Sơn culture and the Yunnanese Dian culture. The wide distribution of these drums, in public museums and private collections, renders their technical and stylisticstudy difficult, and their comparison complex. In this paper, we focus on a copper-base miniature drum assemblage, discovered in a tightly delimited area of northern Vietnam, associated to the {D}ˆong Sơn culture. This multi-disciplinary study incorporates morphological, stylistic, technological, elemental and lead isotopic analysis of a large proportion of a regional drum assemblage for the first time. With this combined approach was intended to improve our knowledge of the people who produced and consumed miniature drums; a class which, until now, has not aroused much interest. The present paper details the archaeometric results of this original analysis, based on 25 samples from the National Museum of History (Hanoi). The results indicate a wide variety of alloy types was used, alongside a range of raw material sources, both with weak correspondence to morpho-stylistic classification.We propose these data evidence {D}ˆong Sơn drum miniature production was practiced in a decentralised manner, using materials at hand, but questions concerning their emergence and their link to burial practices seen in contemporary southern China remains unsolved from an archaeometallurgical point of view but will be thesubject of another paper (Le Meur et al. (forthcoming).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Yeghicheyan_etal2021,

title = {Collaborative determination of trace element mass fractions and isotope ratios in AQUA-1 drinking water certified reference material},

author = {D. Yeghicheyan and P. Grinberg and L. Y. Alleman and M. Belhadj and L. Causse and J. Chmeleff and L. Cordier and I. Djouraev and D. Dumoulin and J. Dumont and R. Freydier and H. Mariot and C. Cloquet and P. Kumkrong and B. Malet and C. Jeandel and A. Marquet and J. Riotte and M. Tharaud and G. Billon and G. Trommetter and F. S\'{e}by and A. Guihou and P. Deschamps and Z. Mester},

doi = {10.1007/s00216-021-03456-8},

year  = {2021},

date = {2021-01-01},

journal = {Analytical and Bioanalytical Chemistry},

volume = {413},

pages = {4959--4978},

abstract = {The Isotrace CNRS workgroup in collaboration with National Research Council of Canada has characterized a number of trace element mass fractions and isotope ratios currently not certified in AQUA-1 natural drinking water reference material (NRC Canada). This survey further expands the use of this material as a tool for environmental quality control, method validation, and method development tool for the international community. Simultaneously, the SLRS-6 river water was analyzed as quality control and also in order to compare both water characteristics, which were sampled in the same area but having undergone different treatment. Mass fractions for B, Cs, Li, Ga, Ge, Hf, Nb, P, Rb, Rh, Re, S, Sc, Se, Si, Sn, Th, Ti, Tl, W, Y, Zr, REEs, and six isotopic ratios are proposed for Sr and Pb. Measurements were mostly performed using ICP-MS with various calibration approaches. The results are reported as consensus or indicative values depending on the number of available datasets, with their associated uncertainties.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zhu_etal2021,

title = {Cadmium isotopic constraints on metal sources in the Huize Zn--Pb deposit, SW China},

author = {C. Zhu and H. Wen and Y. Zhang and Z. Huang and C. Cloquet and B. Luais and T. Yang},

doi = {10.1016/j.gsf.2021.101241},

year  = {2021},

date = {2021-01-01},

journal = {Geoscience Frontiers},

volume = {12},

pages = {101241},

abstract = {The Sichuan--Yunnan--Guizhou (SYG) Zn--Pb metallogenic zone in SW China contains \>400 carbonatehosted hydrothermal Zn--Pb deposits. Some of these, such as the Huize, Tianbaoshan, and Daliangzi deposits, are super-large deposits with significant reserves of Cd, Ge, and Ag. However, the sources of these metals remain controversial. This study investigated the Cd isotopic geochemistry of the Huize deposit, the largest Zn--Pb deposit in the SYG area. Sphalerites formed at three stages in the deposit have different colors : black or dark brown (Stage I), red (Stage II), and light-yellow (Stage III). The d114/110Cd values of the sphalerites are in the order Stage III \< Stage I \< Stage II. Kinetic isotopic fractionation is likely the key factor causing the lower d114/110Cd values in the early formed Stage I sphalerites than in laterformed Stage II sphalerites, with cooling of ore-forming fluids being responsible for the still lower values of the Stage III sphalerites. In galena, the d114/110Cd values are inversely correlated with Cd contents and tend to be higher in high-Zn galena. We speculate that Cd isotopic fractionation was significant during the precipitation of sphalerite and galena, with light Cd isotopes being enriched in galena rather than sphalerite. Comparison of the Cd isotopic signatures and Zn/Cd ratios of different endmembers suggests that the d114/110Cd values and Zn/Cd ratios of sphalerite from the Huize deposit, as well as other largescale deposits from the SYG area, are lie in those range of Emeishan basalts and sedimentary rocks and the mean d114/110Cd values of these deposits show good negative correlation with 1/Cd, suggesting that the ore-forming materials of these deposits were derived from the mixing of Emeishan basalts and sedimentary rocks. This study demonstrates that Cd isotopes can be useful proxies in elucidating ore genesis in large Zn--Pb deposits.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Georgiev_etal2020,

title = {Late Permian--Early Triassic environmental changes recorded by multi-isotope (Re-Os-N-Hg) data and trace metal distribution from the Hovea-3 section,Western Australia},

author = {S. V. Georgiev and H. J. Stein and G. Yang and J. L. Hannah and M. E. B\"{o}ttcher and K. Grice and A. I. Holman and S. Turgeon and S. Simonsen and C. Cloquet},

doi = {10.1016/j.gr.2020.07.007},

year  = {2020},

date = {2020-01-01},

journal = {Gondwana Research},

volume = {88},

pages = {353--372},

abstract = {The temporal coincidence between the Late Permian mass extinction (LPME) and the emplacement of Siberian Trap basalts suggests a causal link between the two events. Here, we discuss stratigraphic changes of organic and inorganic (including isotopic) geochemical properties of marine sediments across the Permian--Triassic boundary (PTB) in the Hovea-3 core, Western Australia, a key PTB section in the southern Neo-Tethys ocean. These data are compared with published data from the Meishan section, southern China, and from the Opal Creek section in western Canada, providing a view of Tethys and Panthalassa changes at the PTB. Trace metal and N-isotopic data, together with organic matter properties suggest that anoxic conditions were established prior to the LPME, intensified close to the LPME, and continued with photic-zone euxinia into the Early Triassic. For the Hovea-3 section, Re-Os ages confirm Changhsingian (253.5 textpm 1.4 Ma) deposition of the dated interval sampled immediately below the stratigraphic level characterized by major lithological and isotopic changes. Evaluation of Re-Os, N, and Hg elemental and isotopic data for Hovea-3 suggests that anoxic conditions in the latest Permianwere generally unrelated to direct magmatic contributions. Amajor increase in the initial Os isotopic ratio of Lower Triassic shales suggest an 8texttimes increase in the Early Triassic continental runoff, based on moderately conservative assumptions for end-members contributing Os to the Permian--Triassic ocean. Comparison to other PTB sections confirms a global signal of increasing Re/Os ratios in the Late Permian, and major and long-lived changes in the isotopic composition of the post-extinction ocean. A distinct peak in Hg concentrations carrying a volcanic isotopic signature, also identified in other PTB sections, likely represents a major pulse of Siberian Trap volcanism. This Hg peak in the Hovea-3 section, however, is detected above the stratigraphic level containing multiple other widely recognized and more permanent geochemical changes. Therefore, direct volcanic inputs to the Permian--Triassic Ocean likely post-date the LPME in thisWestern Australian section.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Lelievre_etal2020,

title = {Identification of the origin of infantile saturnism based on lead isotopic and elemental ratios},

author = {B. Lelievre and C. Bruneau and M. Legeay and J. Parisot and C. Cloquet},

doi = {10.1016/j.jtemb.2020.126627},

year  = {2020},

date = {2020-01-01},

journal = {Journal of Trace Elements in Medecine and Biology},

volume = {62},

pages = {126627},

abstract = {Background : In France, the prevalence of childhood lead poisoning is becoming rare since the avoidance of lead in paints in 1949 and the gradual replacement of water pipes. Chronic lead toxicity is well known and is well correlated to blood lead concentration. Aim : Here we report a case of severe lead poisoning occurring in a young female child with a pica behavior. Methods : A blood sample and four environmental samples were analyzed using inductively coupled plasmamass spectrometry (ICP-MS). Lead concentration, lead isotopes and elemental ratios were compared. Results : The determination of 208Pb/206Pb, 206Pb/207Pb and Cd/Pb has allowed us to identify the origin of lead poisoning. Discussion-conclusion : The source of contamination was eliminated and the child benefited from a psychological and medical follow up. Her outcome was positive. This case illustrated the potential interest of the use of elemental and isotopic ratios for clinical practice as the ICP-MS measurement has allowed a quick response and a rapid eviction of the contaminationtextquoterights source.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Seman_etal2020,

title = {Strontium isotope analysis in ancient glass from South Asia using portable laser ablation sampling},

author = {S. Seman and L. Dussubieux and C. Cloquet and T. O. Pryce},

doi = {10.1111/arcm.12618},

year  = {2020},

date = {2020-01-01},

journal = {Archaeometry},

abstract = {In order to carry out strontium (Sr) isotope analysis, glass artefacts from South Asia were sampled with portable laser ablation (pLA), a relatively novel sampling technique that leaves damage invisible to the naked eye. Subsequently, thermal ionization mass spectrometry (TIMS) was used to obtain Sr isotope ratios after sample dissolution and separation. In this study, the goal was twofold: to determine whether the measurements of Sr isotope ratios were impacted by using a portable laser as a sample tool; and to assess the pertinence of using Sr isotope ratios to provenance Indian glass. Despite a deterioration in the precision of the measurement of the Sr isotope ratios for artefacts sampled with pLA compared with the traditional sampling method, the Sr isotope ratios of certain Indian glass are so different that this does not affect their separation but a comparison of data sets obtained using standard methods and pLA might be challenging.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zelano_etal2020,

title = {Coupling nickel chemical speciation and isotope ratios to decipher nickel dynamics in the Rinorea cf. bengalensis-soil system in Malaysian Borneo},

author = {I. O. Zelano and C. Cloquet and A. Ent and G. Echevarria and R. Gley and G. Landrot and S. Pollastri and F. Fraysse and E. Montarg`es-Pelletier},

doi = {10.1007/s11104-020-04541-0)},

year  = {2020},

date = {2020-01-01},

journal = {Plant Soil},

abstract = {Abstract Aims. Rinorea cf. bengalensis is a Ni hyperaccumulator which occurs in Sabah (Malaysia), on Borneo Island, that is able to accumulate considerable amounts of Ni and influences the Ni cycle in surface soil layers, both in terms of Ni concentration and Ni isotopic composition. In this study, the biogeochemical processes underpinning Ni isotopic fractionation in the soil-plant system and the mechanisms regulating Ni homeostasis in R. cf. bengalensis plants were elucidated. Methods Two specimens of R. cf. bengalensis of different ages and associated surface soils were collected from ultramafic soils in Sabah. Soil mineralogy, Ni concentrations, speciation and isotopic signatures were subsequently determined in plant and soil samples. Results Nickel in R. cf. bengalensis leaves is mainly complexed with citrate. Soil Ni available fractions have different $delta$60Ni values depending on the Ni bearing phases. Rinorea cf. bengalensis specimens take up lighter Ni isotopes and a pronounced isotopic fractionation within the plant is observed, especially in the young specimen. Conclusions The results suggest that the observed fractionation in the young plant can be attributable to kinetic effects (lighter isotopesmove faster),which become less evident in the older specimen, as Ni is redistributed and homogenized through phloem loading and unloading processes.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Cadet_etal2019,

title = {Laotextquoterights central role in Southeast Asian copper exchange networks: A multimethod study of bronzes from the Vilabouly Complex},

author = {M. Cadet and T. Sayavongkhamdy and V. Souksavatdy and T. Luangkhoth and P. Dillmann and C. Cloquet and J. Vernet and P. Piccardo and N. Chang and J. Edgar and E. Foy and T. O. Pryce},

doi = {10.1016/j.jas.2019.104988},

year  = {2019},

date = {2019-01-01},

journal = {Journal of Archaeological Science},

volume = {109},

abstract = {The application of lead isotope-based provenance analysis in Southeast Asia over the last decade has strongly suggested a central role was played by the Lao PDR in regional copper production exchange networks for approximately 1500 years. The Vilabouly Complex, in central Laotextquoterights Savannakhet Province, has revealed major copper mining and smelting sites dated to the regional Iron Age (c. 400 BC -- AD 500) and possibly Bronze Age (c.1000 ?\u{I} 400 BC). Metallurgical practices at the Vilabouly Complex, and indeed for all of the Lao PDR, are unknown, and the propose of this paper is to provide a comprehensive analytical study of the Vilabouly Complex metal assemblage, including 60 copper-base artefacts of multiple typologies. Cut samples of these were subjected to morpho-stylistic, metallographic (OM), elemental (XRF, SEM-EDS) and lead isotope analyses (MC-ICP-MS) in order to reconstruct the range of forms, metalworking materials, techniques (alloying, casting and post-casting treatments) used at the Vilabouly Complex. The results revealed an assemblage composed of copper, bronze and leaded bronze alloys, with a majority consistent with the lead isotopic signature for the Vilabouly Complex copper. The consistent geochemical and technological signature of the majority of artefacts strongly corroborates the extensive onsite production evidence, and fits with the burgeoning regional copper-base metals database for copper metal demand being sated in large part by Lao PDR supply.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Lanceleur_etal2019,

title = {Cycling and atmospheric exchanges of selenium in Canadian subarctic thermokarst ponds},

author = {L. Lanceleur and E. Tessier and M. Bueno and R. Pienitz and F. Bouchard and C. Cloquet and D. Amouroux},

doi = {10.1007/s10533-019-00599-},

year  = {2019},

date = {2019-01-01},

journal = {Biogeochemistry},

abstract = {The levels and speciation of dissolved, particulate and gaseous Se have been measured in five thermokarst ponds in a sporadic and discontinuous permafrost region of northern Quetextasciiacutebec (Canada) during summer oxygen stratification. Evolution of Se concentrations with depth was investigated in sediment cores collected in three different ponds. The potential for inorganic Se transformation in natural pond waters was investigated by experimental incubations of isotopic species-specific tracers of selenite and selenate. Experimental and monitoring observation revealed that high dissolved carbon concentration, suspended particle matter concentration, heterotrophic activity and periphytic biofilms have a significant role in the formation of gaseous selenium species. In sediment, Se is mainly associated with organic matter in the concentration range 0.14--1.6 mg kg-1. Despite low outgassing rates of volatile Se toward the atmosphere (1--97 ng Se m-2 day-1), the large surface occupied by ponds in northern Canada may lead to important exchange rates (ca. 1 ton year-1) at the global scale. Detailed measurements of Se speciation, including volatile compounds, and its reactivity toward heterotrophic activity in selected thaw ponds from the Canadian Subarctic provides new insight to better constrain the biogeochemical pathways leading to Se removal from the water column via atmospheric gas exchange and sediment accumulation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Yeghicheyan_etal2019,

title = {A new interlaboratory characterisation of silicon, rare earth elements and twenty-two other trace element concentrations in the natural river water certified reference material SLRS-6(NRC-CNRC)},

author = {D. Yeghicheyan and D. Aubert and M. Bouhnik Le Coz and J. Chmeleff and S. Delpoux and I. Djouraev and G. Granier and F. Lacan and J. L. Piro and T. Rousseau and C. Cloquet and A. Marquet and C. Menniti and C. Pradoux and R. Freydier and E. Vieira da Silva-Filho and K. Suchorski},

doi = {10.1111/ggr.12268},

year  = {2019},

date = {2019-01-01},

journal = {Geostandards and Geoanalytical Research},

volume = {43},

number = {3},

pages = {475--496},

abstract = {The natural river water reference material SLRS‐6 (NRC‐CNRC) is the newest batch of a quality control material routinely used in many international environmental laboratories. This work presents a nine‐laboratory compilation of measurements of major and trace element concentrations and their related uncertainties, unavailable in the NRC‐CNRC certificate (B, Cs, Li, Ga, Ge, Hf, Nb, P, Rb, Rh, Re, S, Sc, Se, Si, Sn, Th, Ti, Tl, W, Y, Y, Zr and REEs). Measurements were mostly made using inductively coupled plasma‐mass spectrometry. The results are compared with equivalent data for the last batch of the material, SLRS‐5, measured simultaneously with SLRS‐6 in this study. In general, very low concentrations, close to the quantification limits, were found in the new batch. The Sr isotopic ratio is also reported.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fan_etal2018,

title = {Zinc geochemical cycling in a phosphorus-rich ocean during the early Ediacaran},

author = {H. Fan and H. Wen and C. Xiao and T. Zhou and C. Cloquet and X. Zhu},

doi = {10.1029/2018JC014068},

year  = {2018},

date = {2018-01-01},

journal = {Journal of Geochemical Research: Oceans},

volume = {123,},

pages = {5248--5260},

abstract = {During the early Ediacaran, there was a large influx of phosphorus into the oceans and a resultant high phosphorus concentration in seawater, where multicellular eukaryotes may have been the primary type of marine productivity. The eukaryotes could play a critical role in regulating Zn cycling and isotopes. To establish Zn geochemical cycling patterns in the phosphorus-rich ocean, this study investigates Zn isotopic signatures of shallow water phosphorite that contains phosphatized microfossils (Wengtextquoterightan biota) and deep-water shale from the Doushantuo Formation. Our results indicate that phosphorite commonly preserves heavier Zn isotope composition, with an average of 0.80texttenthousand. The positive $delta$66Zn values in phosphorites may be ascribed to Zn isotope fractionation associated with the complexation of Zn with phosphate and the adsorption of isotopically heavy Zn onto Fe-Mn oxides and organismtextquoterights surfaces. We argue that phosphorite may represent an important sink of isotopically heavy Zn in a phosphorus-rich ocean during Earth history. Meanwhile, deep-water organic-rich shale shows an enrichment of isotopically light Zn with an average of 0.23texttenthousand, which may be attributed to sulfide precipitation in mid-depth environment. The organic-rich shale may represent an isotopically light Zn sink. In addition, the highest $delta$66Zn value (0.45texttenthousand) in a euxinic black shale may indicate that Zn isotope signal of anoxic deep water is similar to that of modern deep seawater. If that is the case, it suggests that Zn geochemical cycling in the early Ediacaran oceans was similar to that of modern oceans},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Harlaux_etal2018,

title = {Tracing metal sources in peribatholitic hydrothermal W deposits based on the chemical composition of wolframite: The example of the Variscan French Massif Central},

author = {M. Harlaux and J. Mercadier and C. Marignac and C. Peiffert and C. Cloquet and M. Cuney},

doi = {10.1016/j.chemgeo.2017.12.029},

year  = {2018},

date = {2018-01-01},

journal = {Chemical Geology},

volume = {479},

pages = {58--85},

abstract = {We present a complete dataset for major, minor and trace elements in wolframite ([Fe,Mn]WO4) based on the example of several peribatholitic hydrothermal W deposits located in the Variscan French Massif Central (FMC). The wolframite samples were characterized down to the micrometer scale by combining scanning electron microscopy observations and in situ chemical analysis by electron probe microanalyzer and laser ablation --inductively coupled plasma -- mass spectrometry. Most samples are Fe-dominated wolframites and are characterizedby variable Fe/(Fe +Mn) values for the studied deposits (from 0.36 to 0.86) without significant alteration features. Wolframites present intracrystalline variations for concentrations of several minor and trace elements, principally for Nb, Ta, and Sn, which reflect growth zoning. The minor and trace element compositionsof the different wolframite samples show at first order similar enrichments in Ta, Nb, Sn, Zn, and In, as well as depletions in LREE, Li, Th, Ti, Zr, Hf, Pb, V, Co, and Mg, compared to the upper continental crust. Second order compositional variations are observed between the studied deposits, which can be separated in four main regional geochemical groups. This work highlights that the chemical composition of wolframite is controlled by both the crystallochemical parameters and the composition of the primary hydrothermal fluid. The regional variations observed in the geochemical signatures of wolframite reflect local variations in the composition of the hydrothermal fluid, i.e. variable metal sources. Therefore, this suggests that the minor and trace element contents in wolframite likely represent direct markers of the source of the hydrothermal fluid and ultimately of the metals. The comparison between the trace element compositions of wolframite with the compositions of regional granitic rocks and worldwide shales suggests that evolved peraluminous granites represent the main source of metals in peribatholitic hydrothermal W deposits from the FMC, whereas metasedimentary rocks have a limited to no influence on the metal budget.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{LeGall_etal2018,

title = {The Red Beds series in the Erta Ale segment, North Afar. Evidence for a 6 Ma-old post-rift basin prior to continental rupturing},

author = {B. Le Gall and S. Leleu and R. Pik and F. Jourdan and G. Chazot and D. Ayalew and G. Yirgu and C. Cloquet and F. Chauvet},

doi = {10.1016/j.tecto.2018.10.002},

year  = {2018},

date = {2018-01-01},

journal = {Tectonophysics},

volume = {747-748},

pages = {373--389},

abstract = {The Erta Ale rift segment, North Afar, is regarded as the most mature rift part within the entire Afar rift system. Very little is known about its deformation history because of limited exposures of geological records in its innerfloor, except volcanics of the Erta Ale chain, and the poorly-known Red Beds series along the flanks of the depression. An integrated study, combining sedimentological, geochemical, 40Ar-39 Ar radiometric and tectonic approaches, has been devoted to Red Beds series fl anking the depression to the SW. Our new results allow to argue that (1) the \> 300 m-thick Red Beds exposed section comprises alluvial deposits that enclose (2) basaltic lavas and related sill intrusions that both yield 6 Ma 40Ar-39Ar ages and display similar geochemical affinities, (3) the Red Beds series locally overlap unconformably basement bounding terrains, and (4) are involved in a limited number of low-displacement normal faults that recorded a modest amount of extension (\< 6%), (5) isotope contents of Red Beds volcanics indicate crustal contamination, without any contribution of the Afar plume, by contrast to the younger Erta Ale magmatism which represents the more recent Afar-plume related event in the Erta Ale segment. Combining these results leads us to regard the Red Beds series as part of an alluvial basin that post-dated a major rift event to which are attributed to (1) the present-day Ethiopian fault-scarp, (2) a concealed sedimentary depocenter at depth in its hanging wall, and (3) prominent crustal thinning. Riftward migration and axial focusing of strain during Miocene-Present times is also argued, while later flexuring of the entire Red Beds basin is assigned to magmatic loading during the axial emplacement of the Erta Ale volcanic chain. Lastly, emphasis is put on the large-scale segmentation of the Afar system into the tectonically-accreted Erta Ale rift segment to the north, and the magmatically-accreted Central segment to the south.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Mariet_etal2018,

title = {Tracking past mining activity using trace metals, lead isotopes and compositional data analysis of a sediment core from Longemer Lake, Vosges Mountains, France},

author = {A. L. Mariet and F. Monna and F. Gimbert and C. B\'{e}geot and C. Cloquet and S. Belle and L. Millet and D. Rius and A. V. Walter-Simonnet},

doi = {10.1007/s10933-018-0029-9},

year  = {2018},

date = {2018-01-01},

journal = {Journal of Paleolimnology},

volume = {60},

pages = {399--412},

abstract = {A 157-cm-long sediment core from Longemer Lake in the Vosges Mountains of Francespans the past two millennia and was analyzed for trace metal content and lead isotope composition. Trace metal accumulation rates highlight three maininput phases: Roman Times (cal. 100 BC--AD 400), the Middle Ages (cal. AD 1000--1500), and the twentieth century. Atmospheric contamination displaysa pattern that is similar to that seen in peat bogs from the region, at least until the eighteenth century. Thereafter, the lake sediment record is more precisethan peat records. Some regional mining activity, such as that in archaeologically identified eighteenth-century mining districts, was detected from the leadisotope composition of sediment samples. Compositional data analysis, using six trace metals (silver, arsenic, cadmium, copper, lead and zinc), enabled usto distinguish between background conditions, periods of mining, and of other anthropogenic trace metal emissions, such as the recent use of leaded gasoline.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Mariet_etal2018_2,

title = {High-temporal resolution landscape changes related to anthropogenic activities over the past millennium in the Vosges Mountains (France)},

author = {A. L. Mariet and A. V. Walter-Simonnet and F. Gimbert and C. Cloquet and C. B\'{e}geot},

doi = {10.1007/s13280-018-1044-9},

year  = {2018},

date = {2018-01-01},

journal = {Ambio},

abstract = {Iron mining activities in the Bruche valley (Vosges Mountains, France) date historically from the Roman period to the mid-nineteenth century. The geochemical and palynological study of a core from the peat bog of Le Champ du Feu allows highlighting impacts of these activities over the past millennium. Trace metalcontamination is recorded for lead (Pb), arsenic, zinc, and antimony during the Middle Ages, the sixteenth century, and from cal. AD 1750--1900, with several sources distinguished by Pb isotope analyses. Forest exploitation is attested by the palynological analysis of the core, with exploitation of Fagus for smelting processes and cutting of Abies for agro-pastoralism. This approach highlightsseveral patterns of contamination, corresponding to the mixing sources and the contamination intensity, which can be linked to the pollen assemblage zones. Hence,anthropogenic activities such as mining and farming led to long-term modification of the landscape composition in this mountainous area},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Yang_etal2018,

title = {Cadmium stable isotope variation in a mountain area impacted by acid mine drainage},

author = {W. J. Yang and K. B. Ding and P. Zhang and H. Qiu and C. Cloquet and H. J. Wen and J. L. Morel and R. L. Qiu and Y. T. Tang},

doi = {10.1016/j.scitotenv.2018.07.210},

year  = {2018},

date = {2018-01-01},

journal = {Science of the Total Environment},

volume = {646},

pages = {696--703},

abstract = {The pollution of natural waters and sediments with metals derived from acid mine drainage (AMD) is a global environmental problem. However, the processes governing the transportation and transformation of AMD metals such as Cd in mountainous areas are poorly understood. In this study, the Cd isotopic composition and Cd concentration of river water and sediments (16 sampling sites) from an AMD-affected river in southern China were determined. Cd concentration in river water declined from its source at a tailings dam (304 $mu$g L−1) to a point 14 km downstream (0.32 $mu$g L−1). Sediment Cd concentration ranged from 0.18 to 39.9 $mu$g g−1, suggesting that anthropogenic Cd is derived primarily from the tailing dam and easily enters the solid phase of the river. Isotopic data showed that the dissolved Cd in rivers was characterized by $delta$114/110Cd values ranging from 0.21texttenthousand to 1.03texttenthousand, with a mean of 0.48texttenthousand. The greatest Cd isotope difference was observed between the water and sediments in the LWdam ($Delta$114/110Cd river-sediment=1.61texttenthousand, site 1), likely due to a rapid weathering dissolution of the ore tailings. In the rivertextquoterights upper reach (sites 2--3), isotope difference between river and sediment ($Delta$114/110Cdriver-sediment) ranged from 1.0texttenthousand to 0.91texttenthousand. This suggests that a host of secondary processes might have impacted Cd isotope fractionation, including adsorption, ternary complexation and/or (co)precipitationof Cd on secondary oxides and hydroxides. In the middle and lower reaches, an abruptly elevated $delta$114/110Cd value near farmland (site 10) suggests the existence of a second Cd source. Based on the chemical properties of water samples we can attribute this heavy isotope signature to agricultural fertilizer and drainage from agricultural fields. Our results suggest that Cd isotope is a tracer for identifying and tracking Cd sources and attenuation mechanisms (adsorption/(co)precipitation) in a complex mountain watershed.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zelano_etal2018,

title = {The influence of organic complexation on Ni isotopic fractionation and Ni recycling in the upper soil layers},

author = {I. Zelano and C. Cloquet and F. Fraysse and S. Dong and N. Janot and G. Echevarria and E. Montarg`es-Pelletier},

doi = {10.1016/j.chemgeo.2018.02.023.},

year  = {2018},

date = {2018-01-01},

journal = {Chemical Geology},

volume = {483},

pages = {47--55},

abstract = {The quantification of Ni isotopic fractionation induced by Ni binding to organic acids is a preliminary step to better constrain the mechanisms determining Ni isotopic fingerprint observed in surface soils, waters and plants, as well as the contribution of metal recycling during plant litter degradation. In this study, Ni isotopic fraction induced by reaction with small organic acids, e.g. citric and oxalic acids, and with soil purified humic acids (PHA) was investigated at different Ni-L ratio and pH conditions. The Donnan Membrane Technique was used to separate Ni bound to organic ligands from the free metal. Obtained results highlighted that Ni binding with carboxylic groups produces, in the adopted experimental conditions, a $Delta$60Nibond-free \< 0.2texttenthousand. This value is not high enough to justify neither metal fractionation previously observed between soil and hyperaccumulators, nor the fractionation between different plant parts, e.g. roots and leaves. In parallel, leaf degradation experiments of two hyperaccumulating plants, where Ni is mainly present as Ni-citrate, were performed to simulate litter decomposition and to highlight the contribution of plants on Ni isotopic composition in surface soils and waters. In the case of the hyperaccumulator Alyssum murale, the degradation process did not induce any observable fractionation. On the contrary, during Rinorea bengalensis degradation experiment, a fractionation between Ni leached out in the first 10 days and between 10 and 30 days was observed ($Delta$60Ni10--30day=0.20 textpm 0.05texttenthousand). The observed fractionation evidenced a heterogeneous distribution of Ni within the leaves, and/or distinct chemical bonding to the leaf cells, and finally suggested the influence of the chemical bonding on Ni isotopic signature. Although a precise quantification of plant contribution on Ni isotopic signature in surface soils and waters is still not reached, our results produced important progress to elucidate the role of organic matter in regulating Ni isotopic fingerprint in surface layers.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zhang_etal2018,

title = {Cadmium isotopic evidence for the evolution of marine primary productivity and the biological extinction event during the Permian-Triassic crisis from the Meishan section, South China},

author = {Y. Zhang and H. Wen and C. Zhu and H. Fan and C. Cloquet},

doi = {1016/j.chemgeo.2018.02.005},

year  = {2018},

date = {2018-01-01},

journal = {Chemical Geology},

volume = {481},

pages = {110--118},

abstract = {Cadmium (Cd) isotopic compositions in seawater are important parameters for tracing the biogeochemical cycling of Cd in modern oceans and may be used as a direct proxy for nutrient utilization by phytoplankton and an indirect proxy for primary productivity. In this study, we measured the stable Cd isotope ratios ($delta$114Cd) ofmarine sedimentary carbonates from the Meishan section in Changxing County of Zhejiang Province, South China, the Global Stratotype Section and Point (GSSP) of the Permian-Triassic Boundary (PTB). The results suggest that the inferred marine primary productivity recorded in the marine carbonates from the Late Permian(i.e., before the mass extinction) was high and relatively stable (the $delta$114/110Cd values of carbonates range from +0.31texttenthousandto +0.60texttenthousand; after correction for salinity-controlled fractionation into inorganic calcite, the $delta$114/110Cd values of palaeo-seawater range from +0.47texttenthousandto +0.79texttenthousand). During the mass extinctions, the $delta$114/110Cd values of carbonates abruptly decreased at the beginning of each episode of mass extinction, suggesting that the primary productivity of the palaeo-ocean declined before each episode of extinction events at the PTB. We suggest that the mass extinction events at the PTB in the Meishan section could be a ripple effect due to the destruction of primary producers at the base of the food chain in the palaeo-ocean ecosystem.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Archer_etal2017,

title = {Inter-calibration of a proposed new primary reference standard AA-ETH Zn for zinc isotopic analysis},

author = {C. Archer and M. B. Andersen and C. Cloquet and T. M. Conway and S. Dong and M. Ellwood and R. Moore and J. Nelson and M. Rehk\"{a}mper and O. Rouxel and M. Samanta and K-C. Shin and Y. Sohrin and S. Takano and Wasylenki},

doi = {10.1039/c6ja00282j},

year  = {2017},

date = {2017-01-01},

journal = {Journal of Analytical Atomic Spectrometry},

volume = {32},

pages = {145--149},

abstract = {We have prepared a large volume of pure, concentrated and homogenous zinc standard solution. This new standard solution is intended to be used as a primary reference standard for the zinc isotope community, and to serve as a replacement for the nearly exhausted current reference standard, the so-called JMC-Lyon Zn. The isotopic composition of this new zinc standard (AA-ETH Zn) has been determinedthrough an inter-laboratory calibration exercise, calibrated against the existing JMC-Lyon standard, as well as the certified Zn reference standard IRMM-3702. The data show that the new standard is isotopically indistinguishable from the IRMM-3702 zinc standard, with a weighted d66/64Zn value of 0.28 textdegree/textdegreetextdegree 0.02\& relative to JMC-Lyon. We suggest that this new standard be assigned a d66/64Zn value of+0.28textdegree/textdegreetextdegree for reporting of future Zn isotope data, with the rationale that all existing published Zn isotope data are presented relative to the JMC-Lyon standard. Therefore our proposed presentation allows for a direct comparison with all previously published data, and that are directly traceable to a certifiedreference standard, IRMM-3702 Zn. This standard will be made freely available to all interested labs through contact with the corresponding author.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zhu_etal2017,

title = {Cadmium isotope fractionation in the Fule Mississippi Valley-type deposit, Southwest China},

author = {C. Zhu and H. Wen and Y. Zhang and S. Fu and H. Fan and C. Cloquet},

doi = {10.1007/s00126-016-0691-7},

year  = {2017},

date = {2017-01-01},

journal = {Mineralium Deposita},

volume = {52},

pages = {675--686},

abstract = {High-precision cadmium (Cd) isotope compositions are reported for sphalerite, galena, and smithsonite from the Fule Zn--Pb--Cd deposit, a typical Mississippi Valley-type deposit in Southwest China. Dark sphalerite has lighter $delta$114/ 110Cd values (0.06 to 0.46 texttenthousand) than light sphalerite (0.43 to 0.70 texttenthousand), and the Cd in galena is primarily in the form of sphalerite micro-inclusions with $delta$114/110Cd of −0.35 to 0.39texttenthousand. From early to late stages, $delta$114/110Cd values of smithsonite regularly increase from 0.19 to 0.42texttenthousand, whereasCd/Zn ratios decrease from 252 to 136 ; the $delta$114/110Cd variation pattern of supergene smithsonite reflects kinetic Rayleigh fractionation during low-temperature processes. From the bottom to the top of the orebody, the dark sphalerite has different patterns in $delta$114/110Cd values, Cd/Zn ratios, $delta$34S values, and Fe concentrations compared to the light sphalerite, indicating that dark and light sphalerite formed by different processes. The varying patterns of $delta$144/110Cd values and Cd/Zn ratios within light sphalerite are similar to those of layered smithsonite, and the $delta$144/110Cd values have a positive correlation with $delta$34S values, indicating that Cd isotope fractionation in the light sphalerite was due to kinetic Rayleigh fractionation. Instead, in dark sphalerite, the $delta$144/110Cd values have a negative correlation with $delta$34S values and a positive correlation with the Cd/Zn ratio. Thus, it can be concluded that dark sphalerite could be modeled in terms of two-component mixing (basement fluid and host-rock fluid), which is in agreement with previous explanations for the negative correlation between $delta$66Zn and $delta$34S in some typical Zn--Pb deposits. We propose that the significant variation in Cd isotope composition observed in the Fule Zn--Pb--Cd deposit confirms that Cd isotopes can be used for tracing fluid evolution and ore formation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zhu_etal2017_2,

title = {Cd isotope fractionation during sulfide mineral weathering in the Fule Zn-Pb-Cd deposit, Yunnan Province, Southwest China},

author = {C. Zhu and H. Wen and Y. Zhang and R. Yin and C. Cloquet},

doi = {10.1016/j.scitotenv.2017.10.293},

year  = {2017},

date = {2017-01-01},

journal = {Science of the Total Environment},

volume = {616-617},

pages = {64--72},

abstract = {Zinc (Zn)-Lead (Pb) deposits are generally rich in cadmium (Cd), and the weathering of sulfide minerals in such deposits results in large releases of Cd into the environment. From an environmental and public health standpoint, understanding Cd sources and cycling is critical to identifying potential hazards to humans. In this study, the Cd isotope compositions (expressed as $delta$114/110Cd) of secondary minerals such as anglesite (−0.57 textpm 0.03texttenthousand; 2 S.D.), granular smithsonite (0.04 textpm 0.14texttenthousand; 2 S.D.), layered smithsonite (0.15 textpm 0.40texttenthousand; 2 S.D.), hydrozincite (0.26textpm0.01texttenthousand; 2 S.D.) and clay minerals (−0.01textpm0.06texttenthousand; 2 S.D.) from the Fule Zn-Pb-Cd deposit,Southwest China, are investigated to better understand the Cd sources and cycling in this area. Combined with our previous study (Zhu et al., 2017), the work herein elucidates the patterns of Cd isotopic fractionation during the formation processes of such secondary minerals and traces the weathering of these minerals into the ecosystem. The $delta$114/110Cd values of secondary minerals exhibit the following decreasing trend: hydrozincite N large granular smithsonite N small granular smithsonite N anglesite. Although different amounts of Cd were lost during the formation of equally sized samples, no or minor variations in Cd isotopic composition were observed. However, significant isotopic differences were observed between different size fractions. These results demonstrate that the particle size of secondary minerals and weathering products of sulfide significantly influence Cd isotope composition and fractionation during natural weathering. This systematic fractionation provides an initial foundation for the use of Cd isotopes as environmental tracers in ecosystems and in the global Cd isotope budget.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Hashizume_etal2016,

title = {A biological switch at the ocean surface as a cause of laminations in a Precambrian iron formation},

author = {K. Hashizume and D. L. Pinti and B. Orberger and C. Cloquet and M. Jayananda and H. Soyama},

doi = {10.1016/j.epsl.2016.04.023},

year  = {2016},

date = {2016-01-01},

journal = {Earth and Planetary Science Letters},

volume = {446},

pages = {27--36},

abstract = {Banded iron formations (BIFs) exhibit alternating silica-and iron-rich laminae, potentially reflecting the dynamics of the paleo-environments in which they were formed, although the exact mechanism remains unclear. Here the formation of a 2.7--2.9Ga BIF from Dharwar Craton, India, is deciphered by analyzing the inter-band variations of the redox-sensitive isotope biomarkers, 15N/14N and 56Fe/54Fe. Organic matter with $delta$15N values as high as +12.0 textpm0.8textdegree/textdegreetextdegreeappears to be trapped in silica. Iron oxides exhibit systematically positive $delta$56Fe values, ranging between +0.80 textpm0.05textdegree/textdegreetextdegreeand +1.67 textpm0.02textdegree/textdegreetextdegree. Compared to the iron-rich bands, silica-rich bands, which show higher $delta$56Fe values, exhibit an order of magnitude higher concentrations of 15N-rich organic nitrogen, normalized by the abundances of its host silica. The presence of 15N-rich organic matter may imply the emergence of a modern-like biological nitrogen cycle that requires the formation of oxidized nitrogen compounds. The higher concentration of 15N-rich organic nitrogen for the silica-rich bands possibly suggests that the photosynthetic activity was higher during the formation periods of these bands. The heavier iron isotope compositions of the silica-rich bands cannot be explained alone by iron oxidation through probable pathways. The relative 56Fe-enrichment in silica-rich bands is explained here by the progressive dissolution of iron oxides to the ocean, through iron reduction by 15N-rich organic matter actively produced at the ocean surface. The formation of iron-rich bands possibly corresponds to periods of reduced biological productivity, when precipitated iron was not effectively dissolved to the ocean. The observed shift in the organic concentration between Fe-and Si-richbands could be the switch that triggered the BIF laminations. This shift could conceivably represent periodic fluctuations in the oxygen generation, which possibly occurred over periods of millennia, at the dawn of the Great Oxidation Event.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Meier_etal2016,

title = {Mercury (Hg) in meteorites: Variations in abundance, thermal release profile, mass-dependent and mass-independent isotopic fractionation},

author = {M. Meier and C. Cloquet and B. Marty},

doi = {10.1016/j.gca.2016.03.007},

year  = {2016},

date = {2016-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {182},

pages = {55--72},

abstract = {We have measured the concentration, isotopic composition and thermal release profiles of Mercury (Hg) in a suite of meteorites, including both chondrites and achondrites. We find large variations in Hg concentration between different meteorites (ca. 10 ppb to 14,000 ppb), with the highest concentration orders of magnitude above the expected bulk solar system silicates value. From the presence of several different Hg carrier phases in thermal release profiles (150--650 textdegreeC), we argue that these variations are unlikely to be mainly due to terrestrial contamination. The Hg abundance of meteorites shows no correlation with petrographic type, or mass-dependent fractionation of Hg isotopes. Most carbonaceous chondrites show massindependent enrichments in the odd-numbered isotopes 199Hg and 201Hg. We show that the enrichments are not nucleosynthetic,as we do not find corresponding nucleosynthetic deficits of 196Hg. Instead, they can partially be explained by Hg evaporation and redeposition during heating of asteroids from primordial radionuclides and late-stage impact heating.Non-carbonaceous chondrites, most achondrites and the Earth do not show these enrichments in vapor-phase Hg. All meteorites studied here have however isotopically light Hg (d202Hg = �`u-7 to -1) relative to the Earthtextquoterights average crustal values, which could suggest that the Earth has lost a significant fraction of its primordial Hg. However, the late accretion of carbonaceous chondritic material on the order of �`u2%, which has been suggested to account for the water, carbon, nitrogen and noble gas inventories of the Earth, can also contribute most or all of the Earthtextquoterights current Hg budget. In this case, the isotopically heavy Hg of the Earthtextquoterights crust would have to be the result of isotopic fractionation between surface and deep-Earth reservoirs.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tang_etal2016,

title = {Zinc Isotope Fractionation in the Hyperaccumulator Noccaea caerulescens and the Nonaccumulating Plant Thlaspi arvense at Low and High Zn Supply},

author = {Y. T. Tang and C. Cloquet and T. H. B. Deng and T. Sterckeman and G. Echevarria and W. J. Yang and J. L. Morel and R. L. Qiu},

doi = {10.1021/acs.est.6b00167},

year  = {2016},

date = {2016-01-01},

journal = {Environmental Science \& Technology},

volume = {50},

pages = {8020--8027},

abstract = {On the basis of our previous field survey, we postulate that the pattern and degree of zinc (Zn) isotope fractionation in the Zn hyperaccumulator Noccaea caerulescens (J. \& C. Presl) F. K. Mey may reflect a relationship between Zn bioavailability and plant uptake strategies. Here, we investigated Zn isotope discrimination during Zn uptake and translocation in N. caerulescens and in a nonaccumulator Thlaspi arvense L. with a contrasting Zn accumulation ability in response to low (Zn-L) and high (Zn-H) Zn supplies. The average isotope fractionations of the N. caerulescens plant as a whole, relative to solution ($Delta$66Znplant‑solution), were −0.06 and −0.12texttenthousandat Zn-L-C and Zn-H-C, respectively, indicative of the predominance of a high-affinity (e.g., ZIP transporter proteins) transport across the root cell membrane. For T. arvense, plants were more enriched in light isotopes under Zn-H-A ($Delta$66Znplant‑solution = −0.26texttenthousand) than under Zn-L-A and N. caerulescens plants, implying that a low-affinity (e.g., ion channel) transport might begin to function in the nonaccumulating plants when external Zn supply increases. Within the root tissues of both species, the apoplast fractions retained up to 30% of Zn mass under Zn-H. Moreover, the highest $delta$66Zn (0.75texttenthousand−0.86texttenthousand) was found in tightly bound apoplastic Zn, pointing to the strong sequestration in roots (e.g., binding to high-affinity ligands/precipitation with phosphate) when plants suffer from high Zn stress. During translocation, the magnitude of isotope fractionation was significantly greater at Zn-H ($Delta$66Znroot−shoot = 0.79texttenthousand) than at Zn-L, indicating that fractionation mechanisms associated with root−shoot translocation might be identical to the two plant species. Hence, we clearly demonstrated that Zn isotope fractionation could provide insight into the internal sequestration mechanisms of roots when plants respond to low and high Zn supplies},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wen_etal2016,

title = {Zn/Cd ratios and cadmium isotope evidence for the classification of lead-zinc deposits},

author = {H. Wen and C. Zhu and Y. Zhang and C. Cloquet and H. Fan and S. Fu},

doi = {10.1038/srep25273},

year  = {2016},

date = {2016-01-01},

journal = {Nature. Scientific Reports},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zhang_etal2016,

title = {Cd isotope fractionation during simulated and natural weathering},

author = {Y. Zhang and H. Wen and C. Zhu and H. Fan and C. Luo and J. Liu and C. Cloquet},

doi = {10.1016/j.envpol.2016.04.060},

year  = {2016},

date = {2016-01-01},

journal = {Environmental Pollution},

volume = {216},

pages = {9--17},

abstract = {In practice, stable Cd isotope ratios are being applied to trace pollution sources in the natural environment. However, Cd isotope fractionation during weathering processes is not yet fully understood. We investigated Cd isotope fractionation of PbeZn ore in leaching experiments and in the environment under natural weathering processes. Our leaching experiments demonstrated that the leachate was enriched with heavy Cd isotopes, relative to initial and residual samples (D114/110Cdleachate ?\u{I} initial state textonequarter 0.40e0.50texttenthousand, D114/110Cdleachate ?\u{I} residual state textonequarter 0.36e0.53texttenthousand). For natural samples, d114/110Cd values of stream sediments were higher than those of the corresponding soil samples collected from the riverbank, D114/110Cdstream sediment ?\u{I} soil can be up to 0.50texttenthousand. This observation is consistent with our leaching experiments, which indicate significant Cd isotope fractionation during natural weathering processes. Therefore, natural contributions should be considered when using Cd isotopes to trace anthropogenicpollution in water and sediment systems.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aebischer_etal2015,

title = {Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Qu\'{e}bec},

author = {S. Aebischer and C. Cloquet and J. Carignan and C. Maurice and R. Pienitz},

doi = {10.1016/j.chemgeo.2015.07.028},

year  = {2015},

date = {2015-01-01},

journal = {Chemical Geology},

volume = {142},

pages = {167--178},

abstract = {Iron mining in Schefferville (1939--1977) in subarctic Quebec has left behind large numbers and quantities of tailing deposits. The impact of past mining activity on aquatic ecosystems in the Schefferville area has been studied using geochemical and isotopic (Pb, Zn and Fe) analyses of lake sediments, ore deposits, tailings and epiphytic lichens. Analysis of two sediment cores from Lakes Dauriat and Oksana reveals that the surface geochemical cycle of the Schefferville area has been profoundly disturbed by anthropogenic activity such as mining. Disturbances were particularly abrupt at the transitions from pre-mining to mining and mining to post-mining periods. Elemental and isotopic analyses of the lake sediments reveal four different end-member contributions to the lake sedimentation, with changes in termsof sources and source contribution observed throughout the sedimentation history. End-members were identified using Pb, Zn and Fe isotopes and are consistent for each element. Lead isotope ratios vary from highly radiogenic (206Pb/204Pb= 27) to less radiogenic (206Pb/204Pb= 17.7) from thebottom to the top of the sediment cores. Iron isotope compositions vary from−0.2texttenthousandto 1texttenthousand, the latter value remaining constant throughout the sedimentary history of Lake Oksana. A systematic difference in the Zn isotope ratios of the two lakes is also observed, and can be explained by local differences in basin lithology. In order to identify pollution sources, samples from ores and tailings and epiphytic lichens were measured as proxies of mining activity, lithology, and atmospheric deposition, respectively. The impact of anthropogenic activity is clearly evident in the sediment records and results from mining activity,as well as local urban and industrial activities (waste water inputs). Long-range atmospheric deposition also accounts for some of the variations in isotopic composition measured in the sediments. The systematic coupling of Pb isotopes with Zn or Fe isotopes allows us to identify and constrain the metal sources that contributed to sediment contamination. This study demonstrates that disturbance due to mining activities is very effective in rapidly modifying lake sediment composition. Though the disturbances remained local in terms of geographicextent, the damage to the aquatic ecosystem has been significant and may persist for decades.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Cloquet_etal2015,

title = {Ten years of elemental atmospheric metal fallout and Pb isotopic composition monitoring using lichens in northeastern France},

author = {C. Cloquet and N. Estrade and J. Carignan},

doi = {10.1016/j.crte.2015.04.003},

year  = {2015},

date = {2015-01-01},

journal = {C.R. Geosciences},

volume = {347},

pages = {257--266},

abstract = {We report on the chemical and Pb isotopic compositions of epiphytic lichens collected from small tree branches in the urban area of the city of Metz (NE France). Lichens were collected in five different years between 2001 and 2009. The data are first compared year to year in order to document any temporal change and trend in metal atmospheric fallout. The area studied was then subdivided into different zones on the basis of land use (urban, suburban, rural and industrial) in order to determine potential spatial gradients. The median concentrations and enrichment factors (EF, normalized to Al) of Pb and other metals (Cu, Zn, Cd, Ni, Cr, Hg, Fe) in lichens from the urban, suburban, and rural zones show no systematic variation between 2001 and 2008. However, the metal EFs show spatial variation and are generally highest in the urban area and lowest in the rural area. Lichens within the industrial zone (collected in 2009), which is dominated by steel industries, are richest in Al, Fe, Cr, Pb, and Zn. Although the Al concentration is high in these lichens, the EFs for the cited metals areseveral times higher than those measured in lichens from the other three zones. Nosignificant differences were noted for Hg, Cd, Cu and or Ni. Pb isotopic compositions measured in lichens may be highly variable from year to year and from zone to zone. The variation is primarily interpreted to result from mixing between: (i) Pb added to gasoline (and recycled through re-emission of road dust in the atmosphere); (ii) regional industrial Pb from long-range transportation and/or mixed with urban Pb; and (iii) local industrial Pb. The median isotopic compositions of individual zones are distinct, suggesting variable mixing ofthese three sources. The annual variations show that 2001 was most affected by gasoline Pb, whereas 2003 and 2006 were more affected by the local steel industry.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Estrade_etal2015,

title = {Weathering and vegetation controls on nickel isotope fractionation in surface ultramafic environments (Albania)},

author = {N. Estrade and C. Cloquet and G. Echevarria and T. Sterckeman and T. Deng and Y. T. Tang and J. L. Morel},

doi = {10.1016/j.epsl.2015.04.018},

year  = {2015},

date = {2015-01-01},

journal = {Earth and Planetary Science Letters},

volume = {423},

pages = {24--35},

abstract = {The dissolved nickel (Ni) isotopic composition of rivers and oceans presents an apparent paradox. Even though rivers represent a major source of Ni in the oceans, seawater is more enriched in the heavier isotopes than river-water. Additional sources or processes must therefore be invoked to account for the isotopic budget of dissolved Ni in seawater. Weathering of continental rocks is thought to play a major role in determining the magnitude and sign of isotopic fractionation of metals between a rock and the dissolved product. We present a study of Ni isotopes in the rock--soil--plant systems of several ultramafic environments. The results reveal key insights into the magnitude and the control of isotopic fractionation during the weathering of continental ultramafic rocks. This study introduces new constraints on the influence of vegetation during the weathering process, which should be taken into account in interpretations of the variability of Ni isotopes in rivers.The study area is located in a temperate climate zone within the ophiolitic belt area of Albania. The serpentinized peridotites sampled present a narrow range of heavy Ni isotopic compositions ($delta$60Ni=0.25 textpm0.16textdegree/textdegreetextdegree, 2SD n =2). At two locations, horizons within two soil profiles affected by different degrees of weathering all presented light isotopic compositions compared to the parent rock (60Nisoil--rockup to −0.63textdegree/textdegreetextdegree). This suggests that the soil pool takes up the light isotopes, while the heavier isotopes remain in the dissolved phase. By combining elemental and mineralogical analyses with the isotope compositions determined for the soils, the extent of fractionation was found to be controlled by the secondary minerals formed in the soil.The types of vegetation growing on ultramafic-derived soils are highly adapted and include both Ni-hyperaccumulating species, which can accumulate several percent per weight of Ni, and non-accumulating species. Whole-plant isotopic compositions were found to be isotopically heavier than the soil (60Niwholeplant-soilup to 0.40textdegree/textdegreetextdegree). Fractions of Ni extracted by DTPA (diethylenetriaminepentaaceticacid) presented isotopically heavy compositions compared to the soil (60NiDTPA-soilup to 0.89textdegree/textdegreetextdegree), supporting the hypothesis that the dissolved Ni fraction controlled by weathering has a heavy isotope signature. The non-hyperaccumulators (n =2) were inclined to take up and translocate light Ni isotopes with a large degree of fractionation (60Nileaves-rootsup to −0.60textdegree/textdegreetextdegree). For Ni-hyperaccumulators (n =7), significant isotopic fractionation was observed in the plants in their early growth stages, while no fractionation occurred during later growth stages, when plants are fully loaded with Ni. This suggests that (i) the high-efficiency translocation process involved in hyperaccumulators does not fractionate Ni isotopes, and (ii) the root uptake process mainly controls the isotopic composition of the plant. In ultramafic contexts, vegetation composed of hyperaccumulators can significantly influence isotopic compositions through its remobilization in the upper soil horizon, thereby influencing the isotopic balance of Ni exported to rivers.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Marie_etal2015,

title = {Determination of mercury in one hundred and sixteen geological and environmental reference materials using a drect mercury analyser},

author = {B. Marie and L. Marin and P. Y. Martin and T. Gulon and J. Carignan and C. Cloquet},

doi = {10.1111/j.1751-908X.2014.00254.x},

year  = {2015},

date = {2015-01-01},

journal = {Geostandards and Geoanalytical Research},

volume = {39},

number = {1},

pages = {71--86},

abstract = {The mercury content of 116 reference materials (RMs) from ten international organisations was determined in this study, which focused on variability within andbetween batches of RMs. Direct mercury analysis (DMA) was applied to RMs having Hg contents between 1 and 6300 ng g ?\u{I} 1 and provided good precision and accuracy.Accuracy was demonstrated by the agreement of our results with certified values, while replicates were made to establish the precision. Low within-batch variability was noted, with precision from 0.1 to 23% (n=3--5) apparently depending on Hg content and homogeneity, whereas systematic offsets were detected among several batches. Thanks to the analysis of different batches; the homogeneity or heterogeneity of several RMs was shown, and thus, suitable RMs for quality control for Hg determinations could be recommended},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Remy_etal2015,

title = {Pseudo-first-order reaction of chemically and biologically formed green rusts with HgII and C15H15N3O2: Effects of pH and stabilizing agents (phosphate, silicate, polyacrylic acid, and bacterial cells)},

author = {P. Ph. Remy and M. Etique and A. A. Hazotte and A. S. Sergent and N. Estrade and C. Cloquet and K. Hanna and F. P. A. Jorand},

doi = {10.1016/j.watres.2014.12.007},

year  = {2015},

date = {2015-01-01},

journal = {Water Research},

volume = {70},

pages = {266--278},

abstract = {The kinetics of HgII and methyl red (MR) reduction by hydroxycarbonate green rust (GR1) and by hydroxysulfate green rust (GR2) were studied in the presence of naturally occurring organic and inorganic ligands (phosphate, polyacrylic acid, bacterial cells, silicate). The reducing ability of biogenic hydroxycarbonate green rust (GR1bio), obtained after microbial reduction of lepidocrocite by Shewanella putrefaciens, was also investigated and compared to those of chemically synthesized GR1 and GR2 (GR1ab and GR2ab). Pseudo first-order rate constants (kobs) of HgII reduction (at pH 7.0, 8.2, and 9.5) and MR reduction (at pH 7.0) were determined and were normalized to the structural FeII content of GRs (kFeII) and to the estimated concentration of surface FeII sites (kS). The kS values ranged from 0.3 L mmol-1 min-1 to 43 L mmol-1 min-1 for the Hg reduction, and from 0.007 L mmol-1 min-1 to 3.4 L mmol-1 min-1 for the MR reduction. No significant discrepancy between GRab and GRbio was observed in term of reactivity. However, the reduction kinetics of MR was generally slower than the HgII reduction kinetics for all tested GRs. While a slight difference in HgII reduction rate was noted whatever the pH values (7.0, 8.2, or 9.5), the reduction of MR was significantly affected in the presence of ligands. A decrease by a factor of 2e200, depending on the type of ligand used, was observed. These data give new insights into the reactivity of GRs in the presence of co-occurring organic and inorganic ligands, and have major implications in the characterization of contaminated systems as well as water treatment processes.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wen_etal2015,

title = {Reconstruction of early Cambrian ocean chemistry from Mo isotopes},

author = {H. Wen and H. Fan and Y. Zhang and C. Cloquet and J. Carignan},

doi = {10.1016/j.gca.2015.05.008},

year  = {2015},

date = {2015-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {164},

pages = {1--16},

abstract = {The Neoproterozoic--Cambrian transition was a key time interval in the history of the Earth, especially for variations in oceanic and atmospheric chemical composition. However, two conflicting views exist concerning the nature of ocean chemistry across the Precambrian--Cambrian boundary. Abundant geochemical evidence suggests that oceanic basins were fully oxygenated by the late Ediacaran, while other studies provide seemingly conflicting evidence for anoxic deep waters, with ferruginous conditions [Fe(II)-enriched] persisting into the Cambrian. Here, two early Cambrian sedimentary platform and shelf-slope sections in South China were investigated to trace early Cambrian ocean chemistry from Mo isotopes. The resultsreveal that early Cambrian sediments deposited under oxic to anoxic/euxinic conditions have d98/95Mo values ranging from -0.28textdegree/textdegreetextdegree to 2.29textdegree/textdegreetextdegree, which suggests that early Cambrian seawater may have had d98/95Mo values of at least 2.29textdegree/textdegreetextdegree, similar to modern oceans. The heaviest and relatively homogeneous d98/95Mo values were recorded in siltstone samples formed under completely oxic conditions, which is considered that Mn oxide-free shuttling was responsible for such heavy d98/95Mo value. Further, combined with Fe species data and the accumulation extent of Mo and U, the variation of d98/95Mo values in the two studied sections demonstrate a redox-stratified ocean with completely oxic shallow water and predominantly anoxic (even euxinic) deeper water having developed early on, which eventually became completely oxygenated. This suggests that oceanic circulation at the time became reorganized, and such changes in oceanic chemistry may have been responsible for triggering the textquotelefttextquoteleftCambrian Explosiontextquoterighttextquoteright of biological diversity.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wen_etal2015_2,

title = {Tracing sources of pollution in soils from the Jinding Pb--Zn mining district in China using cadmium and lead isotopes},

author = {H. Wen and Y. Zhang and C. Cloquet and C. Zhu and H. Fan and C. Luo},

doi = {10.1016/j.apgeochem.2014.11.025},

year  = {2015},

date = {2015-01-01},

journal = {Applied Geochemistry},

volume = {52},

pages = {147--154},

abstract = {Systematic variations in the Cd and Pb isotope ratios in polluted topsoils surrounding the Jinding Pb--Zn mine in China were measured so that the sources of the metals could be traced. The average d114/110Cd value and 206Pb/207Pb isotope ratio in background soils from the region were +0.41texttenthousand and 1.1902, respectively,whereas the contaminated soil samples had different values, with the d114/110Cd values varying between -0.59texttenthousand and +0.33texttenthousand and the 206Pb/207Pb isotope ratios varying between 1.1764 and 1.1896. We also measured the Cd and Pb isotopic compositions in oxide ores, sulfide ores, and slags, and found that binary mixing between ores and background soils could explain almost all of the variations in the Cd and Pb isotope ratios in the contaminated soils. This suggests that Cd and Pb pollution in the soils was mainly caused by the deposition of dust emitted during anthropogenic activities (mining and refining).The Pb and Cd isotope ratios clearly showed that contamination in soils in the northeastern part of the area was caused by surface mines and zinc smelters and their slagheaps, while contamination in soils in the southwestern part of the area also came from tailing ponds and underground mines. The main area of soil polluted by dust from Pb--Zn mining processes roughly extended for up to 5 km from the mineitself.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Deng_etal2014,

title = {Nickel and zinc isotope fractionation in hyperaccumulating and nonaccumulating plants},

author = {T. H. B. Deng and C. Cloquet and Y. T. Tang and T. Sterckeman and G. Echevarria and N. Estrade and J. L. Morel and R. L. Qiu},

doi = {10.1021/es5020955},

year  = {2014},

date = {2014-01-01},

journal = {Environmental Science \& Technology},

volume = {48},

pages = {11926--11933},

abstract = {ABSTRACT: Until now, there has been little data on the isotope fractionation of nickel (Ni) in higher plants and how this can be affected by plant Ni and zinc (Zn) homeostasis. A hydroponic cultivation was conducted to investigate the isotope fractionation of Ni and Zn during plant uptake and translocation processes. The nonaccumulator Thlaspi arvense, the Ni hyperaccumulator Alyssum murale and the Ni and Zn hyperaccumulator Noccaea caerulescens were grown in low (2$mu$M) and high (50 $mu$M) Ni and Zn solutions. Results showed that plants were inclined to absorb light Ni isotopes, presumably due to the functioning of low-affinity transportsystems across root cell membrane. The Ni isotope fractionation between plant and solution was greater in the hyperaccumulators grown in low Zn treatments ($Delta$60Niplant‑solution = −0.90 to −0.63texttenthousand) than that in the nonaccumulator T.arvense ($Delta$60Niplant‑solution = −0.21texttenthousand), thus indicating a greater permeability of the low-affinity transport system in hyperaccumulators. Light isotope enrichment of Zn was observed in most of the plants ($Delta$66Znplant‑solution = −0.23 to−0.10texttenthousand), but to a lesser extent than for Ni. The rapid uptake of Zn on the root surfaces caused concentration gradients, which induced ion diffusion in the rhizosphere and could result in light Zn isotope enrichment in the hyperaccumulator N. caerulescens. In high Zn treatment, Zn could compete with Ni during the uptake process, which reduced Ni concentration in plants anddecreased the extent of Ni isotope fractionation ($Delta$60Niplant‑solution = −0.11 to −0.07texttenthousand), indicating that plants might take up Ni through a low-affinity transport system of Zn. We propose that isotope composition analysis for transition elements could become an empirical tool to study plant physiological processes.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wen_etal2014,

title = {Selenium isotopes trace anoxic and ferruginous seawater conditions in the Early Cambrian},

author = {H. Wen and J. Carignan and X. Chu and H. Fan and C. Cloquet and J. Huang and Y. Zhang and H. Chang},

doi = {10.1016/j.chemgeo.2014.10.022},

year  = {2014},

date = {2014-01-01},

journal = {Chemical Geology},

volume = {390},

pages = {164--172},

abstract = {Selenium (Se) isotopes can yield substantial isotopic fractionation (up to 20texttenthousand) confirmed by experiments and field investigations, depending on various biotic or abiotic redox transformations. Therefore, it is expected that redox changes in the ancient oceans would induce significant isotopic fractionation, and the Se isotopic signatures recorded in old sedimentary rocks might provide new insight into how the redox state of the ancient ocean has evolved. However, previous studies have shown that Se is slightly enriched in the lighter isotope relative to the bulk earth values in most deposited conditions (oxic, anoxic, and even sulfidic). Here, our results reveal that ferruginous conditions can result in excessive accumulation of Se in sediments with an elevated Se/S ratio and significant isotope fractionation (about 6texttenthousand), which leads us to propose that Se isotopes are an appropriate geochemical proxy to trace unique oceanic conditions over times. Accordingly, Se isotopic variations measured in three Early Cambrian formations in southern China suggest that anoxic waters with ferruginous conditions must have been present in early Cambrian ocean along the eastern margin of the Yangtze platform, and oceanic circulation was stepwise reorganized. This may have triggered biological diversification from the Ediacaran to the Early Cambrian.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Yeghicheyan_etal2013,

title = {A Compilation of Silicon, Rare Earth Element and Twenty-One other Trace Element Concentrations in the Natural River Water Reference Material SLRS-5 (NRC-CNRC)},

author = {D. Yeghicheyan and C. Bossy and M. Bouhnik Le Coz and C. Douchet and G. Granier and A. Heimburger and F. Lacan and A. Lanzanova and T. C. C. Rousseau and J. L. Seidel and M. Tharaud and F. Candaudap and J. Chmeleff and C. Cloquet and S. Delpoux and M. Labatut and R. Losno and C. Pradoux and Y. Sivry and J. E. Sonke},

doi = {10.1111/j.1751-908X.2013.00232.x},

year  = {2013},

date = {2013-01-01},

journal = {Geostandards and Geoanalytical Research},

volume = {37},

number = {4},

pages = {449--467},

abstract = {The natural river water certified reference material SLRS-5 (NRC-CNRC) was routinely analysed in this study for major and trace elements by ten French laboratories. Most of the measurements were made using ICP-MS. Because no certified values are assigned by NRC-CNRC for silicon and 35 trace element concentrations (rare earth elements, Ag, B, Bi, Cs, Ga, Ge, Li, Nb, P, Rb, Rh, Re, S, Sc, Sn, Th, Ti, Tl, W, Y and Zr), or for isotopic ratios, we providea compilation of the concentrations and related uncertainties obtained by the participating laboratories. Strontium isotopic ratios are also given.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tang_etal2012,

title = {Fractionation of stable zinc isotopes in the field-grown zinc hyperaccumulator Noccaea Caerulescens and the zinc-tolerant plant Silene Vulgaris},

author = {Y. T. Tang and C. Cloquet and T. Sterckeman and G. Echevarria and J. Carignan and R. L. Qiu and J. L. Morel},

doi = {10.1021/es3015056},

year  = {2012},

date = {2012-01-01},

journal = {Environment Science \& Technology},

volume = {46},

pages = {9972--9979},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{VanHeghe_etal2012,

title = {Isotopic analysis of the metabolically relevant transition metals Cu, Fe and Zn in human blood from vegetarians and omnivores using multi-collector ICP-mass spectrometry},

author = {L. Van Heghe and E. Engstr\"{o}m and I. Rodushkin and C. Cloquet and F. Vanhaecke},

doi = {10.1039/c2ja30070b},

year  = {2012},

date = {2012-01-01},

journal = {Journal of Analytical Atomic Spectrometry},

volume = {27},

pages = {1327--1334},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wen_etal2011,

title = {Molybdenum isotopic records across the Precambrian-Cambrian boundary},

author = {H. Wen and J. Carignan and Y. Zhang and H. F. Fan and C. Cloquet and S. Liu},

doi = {10.1130/G32055.1},

year  = {2011},

date = {2011-01-01},

journal = {Geology},

volume = {39},

number = {8},

pages = {775--778},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Haest_etal2010,

title = {Pb isotopic constraints on the formation of the Dikulushi Cu-Pb-Zn-Ag mineralisation, Kundelungu Plateau (Democratic Republic of Congo)},

author = {M. Haest and J. Schneider and C. Cloquet and K. Latruwe and F. Vanhaecke and P. Muchez},

doi = {10.1007/s00126-010-0279-6},

year  = {2010},

date = {2010-01-01},

journal = {Mineralium Deposita},

volume = {45},

number = {4},

pages = {393--410},

abstract = {Base metal-Ag mineralisation at Dikulushi and in other deposits on the Kundelungu Plateau (Democratic Republic of Congo) developed during two episodes. Subeconomic Cu-Pb-Zn-Fe polysulphide ores were generated during the Lufilian Orogeny (c. 520 Ma ago) in a set of E-W- and NE-SW-oriented faults. Their lead has a relatively unradiogenic and internally inhomogeneous isotopic composition (Pb-206/Pb-204 = 18.07-18.49), most likely generated by mixing of Pb from isotopically heterogeneous clastic sources. These sulphides were remobilised and enriched after the Lufilian Orogeny, along reactivated and newly formed NE-SW-oriented faults into a chalcocite-dominated Cu-Ag mineralisation of high economic interest. The chalcocite samples contain only trace amounts of lead and show mostly radiogenic Pb isotope signatures that fall along a linear trend in the Pb-207/Pb-204 vs. Pb-206/Pb-204 diagram (Pb-206/Pb-204 = 18.66-23.65; Pb-207/Pb-204 = 15.72-16.02). These anomalous characteristics reflect a two-stage evolution involving admixture of both radiogenic lead and uranium during a young fluid event possibly c. 100 Ma ago. The Pb isotope systematics of local host rocks to mineralisation also indicate some comparable young disturbance of their U-Th-Pb systems, related to the same event. They could have provided Pb with sufficiently radiogenic compositions that was added to less radiogenic Pb remobilised from precursor Cu-Pb-Zn-Fe polysulphides, whereas the U most likely originated from external sources. Local metal sources are also suggested by the Pb-208/Pb-204-Pb-206/Pb-204 systematics of combined ore and rock lead, which indicate a pronounced and diversified lithological control of the immediate host rocks on the chalcocite-dominated Cu-Ag ores. The Pb isotope systematics of polysulphide mineralisation on the Kundelungu Plateau clearly record a diachronous evolution.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Krznaric_etal2010,

title = {Zn pollution counteracts Cd toxicity in metal-tolerant ectomycorrhizal fungi and their host plant, Pinus sylvestris},

author = {E. Krznaric and J. H. L. Wevers and C. Cloquet and J. Vangronsveld and F. Vanhaecke and J. V. Colpaert},

year  = {2010},

date = {2010-01-01},

journal = {Environmental Microbiology},

volume = {12},

pages = {2133--2141},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wen_etal2010,

title = {Isotopic delta values of molybdenum standard reference and prepared solutions measured by MC-ICP-MS: Proposition for delta zero and secondary references},

author = {H. J. Wen and J. Carignan and C. Cloquet and X. K. Zhu and Y. X. Zhang},

doi = {10.1039/b921060a},

year  = {2010},

date = {2010-01-01},

journal = {Journal of Analytical Atomic Spectrometry},

volume = {25},

number = {5},

pages = {716--721},

abstract = {We report the isotopic composition of five molybdenum (Mo) standard reference solutions and four fractions from one of these solutions eluted through anion resin column relative to a sixth reference solution. The reference solutions were National Institute of Standards and Technology (NIST) SRM 3134 (lot#891307), Johnson Matthey Specpure (JMC)-Mo Sie (lot#602332B), JMC-Mo Wen (lot#13989C), Merck (lot#170334), Sigma-Aldrich (lot#207306) and Prolabo. Measurements were conducted using Isoprobe multi collector inductively coupled plasma mass spectrometer (MC-ICPMS) at the Centre de Recherches Petrographiques et Geochimiques (France) and Nu Plasma MC-ICPMS at either the Ecole Normale Superieure de Lyon (France) or the Laboratory of Isotope Geology in the Ministry of Land and Resources ( China). The sample-standard bracketing method was employed to correct the mass bias for Mo isotopes during instrumental measurement. Except for the Merck Mo solution, all the Mo solutions were identical in isotopic composition within error. Although the JMC Mo solution has been used as the internal reference material by various groups, uncertainty may still occur with different lot numbers and availability might be limited. Here, we propose the NIST 3134 Mo solution as a new candidate for delta zero reference material, used for reporting Mo isotopic composition of natural samples. Isotopic compositions for four eluted fractions of the Sigma-Aldrich Mo solution were 2.18 parts per thousand, 0.98 parts per thousand, -1.10 parts per thousand and -1.95 parts per thousand for delta Mo-97/95 relative to the NIST Mo standard. These values span the range of reported isotopic compositions for natural terrestrial and experimental samples (approximately -0.5 parts per thousand to 1.6 parts per thousand for delta Mo-97/95). We propose these eluted fractions to be used as a secondary reference for Mo isotope measurements. Mo solutions are available at CRPG upon request.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Cloquet_etal2009,

title = {Urban/Peri-Urban Aerosol Survey by Determination of the Concentration and Isotopic Composition of Pb Collected by Transplanted Lichen Hypogymnia physodes},

author = {C. Cloquet and D. De Muynck and J. Signoret and F. Vanhaecke},

year  = {2009},

date = {2009-01-01},

journal = {Environmental Science and Technology},

volume = {43},

number = {3},

pages = {623--629},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sterckeman_etal2009,

title = {Availability of soil cadmium using stable and radioactive isotope dilution},

author = {T. Sterckeman and J. Carignan and I. Srayeddin and D. Baize and C. Cloquet},

doi = {10.1016/j.geoderma.2009.08.026},

year  = {2009},

date = {2009-01-01},

journal = {Geoderma},

volume = {153},

pages = {372--378},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Brenot_etal2008,

title = {Magnesium isotope systematics of the lithologically varied Moselle river basin, France},

author = {A. Brenot and C. Cloquet and N. Vigier and J. Carignan and C. France-Lanord},

doi = {10.1016/j.gca.2008.07.027},

year  = {2008},

date = {2008-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {72},

number = {20},

pages = {5070--5089},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Cloquet_etal2008,

title = {Variation in the isotopic composition of zinc in the natural environment and the use of zinc isotopes in biogeosciences: a review},

author = {C. Cloquet and J. Carignan and M. F. Lehmann and F. Vanhaecke},

doi = {10.1007/s00216-007-1635-y},

year  = {2008},

date = {2008-01-01},

journal = {Anal. Bioanal. Chem.},

volume = {390},

pages = {451--463},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{DeMuynck_etal2008,

title = {Lead isotopic analysis of infant bone tissue dating from the Roman era via multicollector ICP-mass spectrometry},

author = {D. De Muynck and C. Cloquet and E. Smits and F. A. Wolff and G. Quitt\'{e} and L. Moens and F. Vanhaecke},

doi = {10.1007/s00216-007-1679-z},

year  = {2008},

date = {2008-01-01},

journal = {Anal. Bioanal. Chem.},

volume = {390},

pages = {477--486},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{DeMuynck_etal2008_2,

title = {Development of a new method for Pb isotopic analysis of archaeological artefacts using single-collector ICP-dynamic reaction cell-MS},

author = {D. De Muynck and C. Cloquet and F. Vanhaecke},

doi = {10.1039/b709461b},

year  = {2008},

date = {2008-01-01},

journal = {Journal of Analytical Atomic Spectrometry},

volume = {23},

number = {1},

pages = {62--71},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{LeRoux_etal2008,

title = {Comment on textquotelefttextquoteleftThe biosphere: A homogeniser of Pb-isotope signalstextquoterighttextquoteright by C. Reimann, B. Flem, A. Arnoldussen, P. Englmaier, T.E. Finne, F. Koller and \O. Nordgulen},

author = {G. Le Roux and J. E. Sonke and C. Cloquet and D. Aubert and F. Vleeschouwer},

doi = {10.1016/j.apgeochem.2008.05.017},

year  = {2008},

date = {2008-01-01},

journal = {Applied Geochemistry},

volume = {23},

pages = {2789--2792},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Resano_etal2008,

title = {Laser ablation-inductively coupled plasma-dynamic reaction cell-mass spectrometry for the determination of lead isotope ratios in ancient glazed ceramics for discriminating purposes},

author = {M. Resano and P. Marzo and J. P\'{e}rez-Arantegui and M. Aramendia and C. Cloquet and F. Vanhaecke},

year  = {2008},

date = {2008-01-01},

journal = {Journal of Analytical Atomic Spectrometry},

volume = {23},

pages = {1182--1191},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Cloquet_etal2006,

title = {Atmospheric pollutant dispersion around an urban area using trace metal concentrations and Pb isotopic compositions in epiphytic lichens},

author = {C. Cloquet and J. Carignan and G. Libourel},

year  = {2006},

date = {2006-01-01},

journal = {Atmospheric Environment},

volume = {40},

number = {3},

pages = {574--587},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Cloquet_etal2006_2,

title = {Isotopic composition of Zn and Pb atmospheric depositions in an urban/periurban area of northeastern France},

author = {C. Cloquet and J. Carignan and G. Libourel},

doi = {10.1021/es0609654},

year  = {2006},

date = {2006-01-01},

journal = {Environmental Science \& Technology},

volume = {40},

number = {21},

pages = {6594--6600},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Cloquet_etal2006_3,

title = {Tracing source pollution in soils using cadmium and lead isotopes},

author = {C. Cloquet and J. Carignan and G. Libourel and T. Sterckeman and E. Perdrix},

doi = {10.1021/es052232+},

year  = {2006},

date = {2006-01-01},

journal = {Environmental Science \& Technology},

volume = {40},

pages = {2525--2530},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Carignan_etal2005,

title = {Lead isotopic composition of fly ash and flue gas residues from municipal solid waste combustors in France: implications for atmospheric lead source tracing},

author = {J. Carignan and G. Libourel and C. Cloquet and L. Le Forestier},

doi = {10.1021/es048693x},

year  = {2005},

date = {2005-01-01},

journal = {Environmental Science \& Technology},

volume = {39},

pages = {2018--2024},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Cloquet_etal2005,

title = {Natural Cadmium isotopic variations in eight geological reference materials (NIST 2711, BCR 176, GSS 1, GXR-1, GXR-2, Nod-P-1, Nod-A-1) and anthropogenic samples, measured by MC-ICP-MS},

author = {C. Cloquet and O. Rouxel and J. Carignan and G. Libourel},

doi = {10.1111/j.1751-908X.2005.tb00658.x},

year  = {2005},

date = {2005-01-01},

journal = {Geostandards and Geoanalytical Research},

volume = {29},

number = {1},

pages = {95--106},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Galy_etal2003,

title = {Magnesium isotope heterogeneity of the isotopic standard SRM980 and new reference materials for magnesium-isotope-ratio measurements},

author = {A. Galy and O. Yoffe and P. E. Janney and R. W. Williams and C. Cloquet and O. Alard and L. Alicz and M. Wadhwa and I. D. Hutcheon and E. Ramon and J. Carignan},

doi = {10.1039/b309273a},

year  = {2003},

date = {2003-01-01},

journal = {Journal of Analytical Atomic Spectrometry},

volume = {18},

number = {11},

pages = {1352--1356},

keywords = {},

pubstate = {published},

tppubtype = {article}

}