Andrey Gurenko

@article{Thiry_etal2022,

title = {Albitization and oxidation of Variscan granitoid rocks related to the post-Variscan paleosurface in the Sudetes (Bohemian Massif, SW Poland)},

author = {M. Thiry and C. Franke and K. F. E. Yao and A. Szuszkiewicz and C. Fabrega and M. Jelenska and M. Kadzialko-Hofmokl and A. Gurenko and D. Parcerisa and A. Sobczyk and K. Turniak and P. Aleksandrowski},

doi = {10.1007/s00531-022-02274-2},

year  = {2022},

date = {2022-01-01},

journal = {International Journal of Earth Sciences},

abstract = {The reddened granitoid facies in the basement of the Polish Sudetes exhibits two categories of alteration spatially arranged with respect to fractures: (1) saussuritization and sericitization within light-colored facies in the interior of fracture-bounded blocks and (2) albitization and hematization in reddened facies occurring adjacent to fracture walls. These alterations are associated with the chloritization of primary ferromagnesian minerals and the development of secondary minerals such as quartz, K-feldspar, apatite, prehnite, calcite, and titanite. We link these parageneses and the observed zonation to a unique alteration event consisting of an interplay of chemical reactions of variable spatial extent. The complete albitization of the feldspars (plagioclase and K-feldspar) adjacent to fractures points to a significant supply of Na for albite neoformation and the availability of oxygen to form the associated hematite. The dating of the iron oxides by paleomagnetism and the secondary monazite associated with the albitized facies by U-Th-Pbtotal unambiguously indicates their post-Variscan ages. In this context, the alterations are related to a regionally widespread post-Variscan paleosurface. The weathering profiles formed in phreatic groundwater environments downgradient of highlands that provided a hydrological head. Sodium supply likely originated from gigantic salt playas that characterized Permian and Triassic lowlands. Weathering was interrupted by the Mesozoic transgression. The recognition of these weathering profiles over extensive parts of the Variscan Belt provides the basis for reconstructing the post-Variscan paleosurface and constraining Triassic and post-Triassic geodynamics, including erosion rates and geomorphological evolution of the Paleozoic massifs in Europe.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Borisova_etal2022,

title = {Hadean zircon formed due to hydrated ultramafic protocrust melting},

author = {A. Y. Borisova and A. N\'{e}d\'{e}lec and N. R. Zagrtdenov and M. J. Toplis and W. A. Bohrson and O. G. Safonov and I. N. Bindeman and O. E. Melnik and G. S. Pokrovski and G. Ceuleneer and K. P. Jochum and B. Stoll and U. Weis and A. Y. Bychikov and A. A. Gurenko},

doi = {10.1130/G49354.1},

year  = {2022},

date = {2022-01-01},

journal = {Geology},

volume = {50},

number = {3},

pages = {300--304},

abstract = {Hadean zircons, from the Jack Hills (Western Australia) and other localities, are currently the only window into the earliest terrestrial felsic crust, the formation of which remains enigmatic. Based upon new experimental results, generation of such early crust has been hypothesized to involve the partial melting of hydrated peridotite interacting with basaltic melt at low pressure (\<10 km), but it has yet to be demonstrated that such liquids can indeed crystallize zircons comparable to Jack Hills zircon. We used thermodynamic and geochemical modeling to test this hypothesis. The predicted zircon saturation temperatures of \<750 textdegreeC, together with the model zircon Th, U, Nb, Hf, Y, and rare earth element (REE) contents at 700 textdegreeC, $delta$18OVSMOW (Vienna standard mean ocean water) signatures, and co-crystallizing mineral assemblage were compared to those of the Jack Hills zircon. This comparison was favorable with respect to crystallization temperature, most trace-element contents, and mineral inclusions in zircon. The discrepancy in $delta$18OVSMOW signatures may be explained by hotter conditions of Hadean protocrust hydration. Our work supports the idea that felsic magma generation at shallow depths involving a primordial weathered ultramafic protocrust and local basaltic intrusions is indeed a viable mechanism for the formation of felsic crust on early Earth.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Borisova_etal2021,

title = {Hydrated peridotite -- basaltic melt interaction Part I : Planetary felsic crust formation at shallow depth},

author = {A. Y. Borisova and N. R. Zagrtdenov and M. J. Toplis and W. A. Bohrson and N\'{e}d\'{e}lec$ and O. G. Safonov and G. S. Pokrovski and G. Ceuleneer and I. N. Bindeman and O. E. Melnik and K. P. Jochum and B. Stoll and U. Weis and A. Y. Bychkov and A. A. and Gurenko},

doi = {10.3389/feart.2021.640464},

year  = {2021},

date = {2021-01-01},

journal = {Frontiers in Earth Science},

volume = {9},

pages = {640464},

abstract = {Current theories suggest that the first continental crust on Earth, and possibly on other terrestrial planets, may have been produced early in their history by direct melting of hydrated peridotite. However, the conditions, mechanisms and necessary ingredients for this crustal formation remain elusive. To fill this gap, we conducted time-series experiments to investigate the reaction of serpentinite with variable proportions (from 0 to 87 wt%) of basaltic melt at temperatures of 1,250--1,300textdegreeC and pressures of 0.2--1.0 GPa (corresponding to lithostatic depths of �`u5--30 km). The experiments at 0.2 GPa reveal the formation of forsterite-rich olivine (Fo90--94) and chromite coexisting with silica-rich liquids (57--71 wt% SiO2). These melts share geochemical similarities with tonalite-trondhjemite-granodiorite rocks (TTG) identified in modern terrestrial oceanic mantle settings. By contrast, liquids formed at pressures of 1.0 GPa are poorer in silica (�`u50 wt% SiO2). Our results suggest a new mechanism for the formation of the embryonic continental crust via aqueous fluid-assisted partial melting of peridotite at relatively low pressures (�`u0.2 GPa). We hypothesize that such a mechanism of felsic crust formation may have been widespread on the early Earth and, possibly on Mars as well, before the onset of modern plate tectonics and just after solidification of the first ultramafic-mafic magma ocean and alteration of this primitive protocrust by seawater at depths of less than 10 km.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Bouden_etal2021,

title = {Triple oxygen isotope measurements by multi-collector secondary ion mass spectrometry},

author = {N. Bouden and J. Villeneuve and Y. Marrocchi and E. Deloule and E. F\"{u}ri and A. Gurenko and L. Piani and E. Thomassot and P. Peres and F. Fernandes},

doi = {doi: 10.3389/feart.2020.601169},

year  = {2021},

date = {2021-01-01},

journal = {Frontiers in Earth Science},

pages = {8:601169},

abstract = {Secondary ion mass spectrometry (SIMS) is a powerful technique for in situ triple oxygen isotope measurements that has been used for more than 30 years. Since pioneering works performed on small-radius ion microprobes in the mid-80s, tremendous progress has been made in terms of analytical precision, spatial resolution and analysis duration. In this respect, the emergence in the mid-90s of the large-radius ion microprobe equipped with a multi-collector system (MC-SIMS) was a game changer. Further developments achieved on CAMECA MC-SIMS since then (e.g., stability of the electronics, enhanced transmission of secondary ions, automatic centering of the secondary ion beam, enhanced control of the magnetic field, 1012$\Omega$ resistor for the Faraday cup amplifiers) allow nowadays to routinely measure oxygen isotopic ratios (18O/16O and 17O/16O) in various matrices with a precision (internal error and reproducibility) better than 0.5texttenthousand (2$sigma$), a spatial resolution smaller than 10 $mu$m and in a few minutes per analysis. This paper focuses on the application of the MC-SIMS technique to the in situ monitoring of mass-independent triple oxygen isotope variations.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fri_etal2021,

title = {In situ quantification of the nitrogen content of olivine-hosted melt inclusions from Klyuchevskoy volcano (Kamchatka) : Implications for nitrogen recycling at subduction zones},

author = {E. F\"{u}ri and M. Portnyagin and N. Mironov and C. Deligny and A. Gurenko and R. Botcharnikov and F. Holtz},

doi = {10.1016/j.chemgeo.2021.120456},

year  = {2021},

date = {2021-01-01},

journal = {Chemical Geology},

volume = {582},

pages = {120456},

abstract = {Assessing the N content of arc magmas and their mantle source remains a challenge because the volatile element composition of melts and gases can be modified during magma ascent, storage, and eruption. Given that melt inclusions (MIs) in Mg-rich olivine represent the best proxies for primary arc melts, we applied, for the first time, an in situ high-resolution secondary ion mass spectrometry (SIMS) method to determine the N concentration in olivine-hosted MIs from Klyuchevskoy volcano in Kamchatka. To reverse the effects of post-entrapment modification processes (i.e., exsolution of volatiles into a fluid bubble), the MIs were partially to completely homogenized at high temperatures (1150--1400 ◦C) and pressures ranging from 0.1 to 500 MPa under dry to H2Osaturated conditions at variable oxygen fugacities (CCO to QFM + 3.3). After the experiments, N concentrations in water-rich MI glasses correlate positively with H2O and CO2 contents as well as with N/CO2 ratios, and negatively with the volume of the remaining fluid bubble. Glasses of completely homogenized (fluid bubble-free) MIs contain up to 25.7 textpm 0.5 ppm N, whereas glasses of three unheated (natural, bubble-bearing) MIs have significantly lower N concentrations of 1 textpm 0.3 ppm. The N-CO2-Nb characteristics of completely homogenized MIs indicate that melts feeding Klyuchevskoy volcano have high absolute concentrations of both N and CO2, as well as large excess of these volatiles relative to Nb, compared to primary mid-ocean ridge melts. This implies that large amounts of N and CO2 in Klyuchevskoy melts and their mantle source are derived from the subducting slab, and that these subducted volatiles are (partially) returned to the crust and atmosphere by arc-related magmatism.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko2021,

title = {Origin of sulphur in relation to silicate-sulphide immiscibility in Tolbachik primitive arc magma (Kamchatka, Russia): Insights from sulphur and boron isoto},

author = {A. A. Gurenko},

doi = {10.1016/j.chemgeo.2021.120244},

year  = {2021},

date = {2021-01-01},

journal = {Chemical Geology},

volume = {576},

pages = {120244},

abstract = {This study reports the first measurements of sulphur and boron isotopic compositions in olivine-hosted melt inclusions (MI) from basaltic lava and scoria deposits from the 1941 Tolbachik eruption, Kamchatka, Russia. The primary aim of the present study is to constrain the origin of sulphur in relation to silicate-sulphide immiscibility that occurred in the Tolbachik mafic magmas. Melt inclusions fall into two compositionally distinct groups based on their S- and B-isotope systematics, the first is hosted by olivine from lava and the second in olivine from lapilli and scoria. The upper ends of the concentration ranges for CO2 (3660--4200 $mu$g/g) and H2O (4.5--5.9 wt%) imply the onset of magma crystallization between textasciitilde25 and textasciitilde30 km for both MI groups, i.e., close to the Moho discontinuity. After filtering the compositions of melt inclusions experienced H2O-loss due to the diffusion of H from olivine hosts, both lava- and scoria-related melt inclusions are characterized by similar fractionation depths between textasciitilde15 and textasciitilde30 km. The inclusions from scoria show no signs of sulphur degassing at depth and, along with the most S-rich inclusions from lava, exhibit enrichment in S. Strong positive correlations of S/K2O with H2O/K2O, Cl/K2O and F/K2O, as well as the correlations of these ratios with $delta$34S also preclude significant S-loss by degassing and point towards mixing of at least two magmas containing contrasting volatile concentrations and isotopic compositions. Slab-derived 11B-enriched fluids and, to a minor extent, 11B-depleted melts could be major agents controlling the composition of the mantle wedge and, consequently, the chemical and isotopic variability of its derivative melts. A subducted serpentinized peridotite could serve as a possible source of the 11B- and probably the 34S-rich signature of the studied primitive Tolbachik magmas.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Barosch_etal2020,

title = {An unusual compound object in Yamato 793408 (H3.2-an) : The missing link between compound chondrules and macrochondrules ?},

author = {J. Barosch and D. C. Hezel and Y. Marrocchi and A. Gurenko and C. Lenting},

doi = {10.1111/maps.13496},

year  = {2020},

date = {2020-01-01},

journal = {Meteoritics \& Planetary Science},

volume = {55},

pages = {1458--1470},

abstract = {We found a large ( 2 mm) compound object in the primitive Yamato 793408 (H3.2‐an) chondrite. It consists mostly of microcrystalline material, similar to chondrule mesostasis, that hosts an intact barred olivine (BO) chondrule. The object contains euhedral pyroxene and large individual olivine grains. Some olivine cores are indicative of refractory forsterites with very low Fe‐ and high Ca, Al‐concentrations, although no 16O enrichment. The entire object is most likely a new and unique type, as no similar compound object has been described so far. We propose that it represents an intermediate stage between compound chondrules and macrochondrules, and formed from the collision between chondrules at low velocities (below 1 m s−1) at high temperatures (around 1550 textdegreeC). The macrochondrule also trapped and preserved a smaller BO chondrule. This object appears to be the first direct evidence for a genetic link between compound chondrules and macrochondrules. In accordance with previous suggestions and studies, compound chondrules and macrochondrules likely formed by the same mechanism of chondrule collisions, and each represents different formation conditions, such as ambient temperature and collision speed.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kokh_etal2020,

title = {Multiple sulfur isotope fractionation in hydrothermal systems in the presence of radical ions and molecular sulfur},

author = {M. A. Kokh and N. Assayag and S. Mounic and P. Cartigny and A. Gurenko and G. S. Pokrovski},

doi = {10.1016/j.gca.2020.06.016},

year  = {2020},

date = {2020-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {285},

pages = {100--128},

abstract = {This study is aimed to evaluate the role played by the sulfur radical ions (S3− and S2−) and molecular sulfur (S0) on sulfur isotope fractionation and to investigate if these species may leave an isotope fingerprint in hydrothermal systems. For this purpose, we combined (i) experiments using a hydrothermal reactor with aqueous S3−(S2−)-S0-sulfate-sulfide fluids and pyrite across a wide range of temperatures (300--450 textdegreeC), pressures (300--800 bars), fluid acidity (4 \< pH \< 8) and with elevated total sulfur concentrations (0.1--1.0 mol/kg fluid) favorable for formation of those polymeric sulfur species, (ii) precise quadruple S isotope analyses of the different S-bearing aqueous species in sampled fluids and in-situ precipitated pyrite, and (iii) thermodynamic modeling of sulfur aqueous speciation and solubility. Our results quantitatively confirm both equilibrium and kinetic SO4-H2S and pyrite-H2S mass dependent fractionation (MDF) factors previously established using extensive experimental and natural data from more dilute fluids in which polymeric sulfur species are negligible. MDF signatures of S0 measured in the sampled fluids of this study reveal different S0-forming pathways such as (i) breakdown on cooling of S3− (and S2−) and other chain-like S0 polymers only stable at high temperature and being isotopically identical to H2S; (ii) cyclooctasulfur (S80, liquid or solid) precipitating by recombination of sulfate and sulfide and/or by exchange with polysulfide dianions (Sn2−) on cooling and being slightly 34S-enriched compared to H2S (by �`u2texttenthousand of $delta$34S); and iii) a different type of S0 resulting from thiosulfate irreversible breakdown and being highly 34S-depleted (by �`u12texttenthousand) relative to H2S. Our data do not show any significant mass independent fractionation (MIF) of 33S and 36S, with $Delta$33S and $Delta$36S values of any S aqueous species and pyrite being within textpm0.1texttenthousand and textpm1.0texttenthousand, respectively. Therefore, under the investigated experimental conditions, the radical S3− ion is unlikely to generate significant MIF in the hydrothermal fluid phase and in pyrite and native sulfur precipitated therefrom. Our study supports the existing interpretations of small $Delta$33S and $Delta$36S variations between sulfide/sulfate-bearing fluid and pyrite as MDF in terms of reaction kinetics, different reaction pathways, and mass conservation effects such as mixing of S reservoirs or Rayleigh distillation. Our data extend, across a wider range of sulfur concentration and chemical speciation, the existing multiple S isotopes models that exploit such variations as a complement to the traditional $delta$34S tracer to monitor the approach to equilibrium and evolution of hydrothermal fluids.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tollan_etal2020,

title = {Elucidating the processes affecting highly primitive lavas of the Borgarhraun flow (northern Iceland) using trace elements in olivine},

author = {P. Tollan and A. Gurenko and J. Hermann},

doi = {10.1016/j.gca.2020.07.033},

year  = {2020},

date = {2020-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {286},

pages = {441--460},

abstract = {Olivine is typically the first phase to crystallise from basaltic melts and its chemistry can therefore inform on the earliest stages of magmatic evolution, not recorded by later crystallising phases. Despite the potential of olivine for understanding primitive differentiation, limited analytical capabilities have previously restricted the range of elements that can be routinely measured. Consequently, important processes controlling early magma evolution may have been overlooked or misidentified. This study reports a wide range of minor and trace elements in forsteritic (up to Fo92.2) olivine macrocrysts from the primitive Borgarhraun lava flow in northern Iceland.We define two distinct populations of olivine based on their forsterite (Fo) content and then apply minor and trace element data to discern mixing and crystallisation of subtly different high-MgO parental melts. High-Fo (90.9--92.2 mol%) olivines show approximately linear trends between Cr and other incompatible trace elements (Li, Na, Ca, Ti, Al and Y), implying mixing and concurrent crystallisation of two highly primitive melts. Low-Fo (87.4--90.0 mol%) olivines show trends that indicate mixing and crystallisation of multiple, genetically distinct and less primitive melts. The outermost 50 $mu$m of the olivine microcrysts record diffusive re-equilibration of the olivine macrocrysts to a single, significantly more evolved carrier liquid over an ascent timescale of 70--250 days. Compared to the rest of Iceland, the Borgarhraun olivine macrocrysts are distinguished by their Cr contents, which extend from 97 to 1150 ppm. The uniquely steep trend in Fo vs. Cr can be explained by early crystallisation of Cr-spinel and Cr-rich clinopyroxene, stabilised by high pressures of differentiation (\>0.8 GPa). Chromium-forsterite systematics may therefore be a powerful tool for qualitatively assessing relative pressures of crystallisation for different magmatic systems. Collectively, our new dataset clearly demonstrates the importance of measuring trace elements in olivine for identifying the formative stages and conditions of basaltic magmatic systems.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fabrega_etal2019,

title = {Permian--Triassic red‑stained albitized profiles in the granitic basement of NE Spain: evidence for deep alteration related to the Triassic palaeosurface},

author = {C. Fabrega and D. Parcerisa and M. Thiry and C. Franke and A. Gurenko and D. Gomez-Gras and J. Sol\'{e} and A. Trav\'{e}},

doi = {10.1007/s00531-019-01764-0},

year  = {2019},

date = {2019-01-01},

journal = {International Journal of Earth Sciences},

abstract = {Extensive areas of the Variscan granitic basement in NE Spain display profiles of red-stained albitized facies characterized by albitization of Ca-plagioclase, chloritization of biotite and microclinization of orthoclase, along with the alteration of igneous quartz to secondary CL-dark quartz. These profiles have a geopetal structure beneath the Triassic unconformity, with a very intense and pervasive alteration in the upper part that progressively decreases with depth to 150--200 m where the alteration is restricted to the walls of fractures. The red albitized facies contains secondary maghemite and hematite that indicate oxidizing conditions. Dating of microclinized orthoclase and secondary monazite that have formed in the red-stained albitized facies yielded K--Ar and U--Th--Pbtotal ages of 240 and 250 Ma, respectively, suggesting that the alteration developed during the Permian--Triassic period. The geopetal disposition of the red albitized profile with respect to the Triassic unconformity, its large regional extent, and the fracture-controlled alteration in the lower part of the profile indicate groundwaterinteraction. The $delta$18O values of albitized plagioclase (+ 11texttenthousand), microclinized orthoclase (+ 13texttenthousand), and secondary CL-dark quartz (+ 12texttenthousand) suggest that the alteration temperature was about 55 textdegreeC. This textquotelefttextquoteleftlowtextquoterighttextquoteright temperature suggests that the alteration occurred during interaction of the granitic rocks with Na-rich fluids below a surficial weathering mantle on the Permian--Triassic palaeosurface. The latter is possibly related to Triassic evaporitic environments in long-lasting, stable landscapes in which Na-rich solutions infiltrated deep regional groundwaters.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Portnyagin_etal2019,

title = {Dehydration of melt inclusions in olivine and implications for the origin of silica-undersaturated island-arc melts},

author = {M. Portnyagin and N. Mironov and R. Botcharnikov and A. Gurenko and R. R. Almeev and C. Luft and F. Holtz},

doi = {10.1016/j.epsl.2019.04.021},

year  = {2019},

date = {2019-01-01},

journal = {Earth and Planetary Science Letters},

volume = {517},

pages = {95--105},

abstract = {Primary subduction-related magmas build up modern continental crust and counterbalance massive recycling of crustal material into the deep mantle occurring at this tectonic setting. Melt inclusions in Mg-rich olivine are believed to be the best probes of primary subduction-related melts. However, unexpectedly, most of such inclusions are SiO2-undersaturated, in contrast to predominantly SiO2-saturated island-arc rocks. The origin of these melts has been explained by melting of amphibole-bearing pyroxenites in the lower crust or upper mantle. The current models fail, however, to explain the high abundance of SiO2-undersaturated melts as well as their compositional difference with host rocks for the major elements but not for incompatible trace elements. Here we report results from the investigation of rocks and melt inclusions in olivine from Klyuchevskoy volcano in Kamchatka. We show that experimental re-hydration of SiO2-undersaturated melt inclusions in olivine Fo85−90 at 300 MPa pressure and 1200 textdegreeC causes a concomitant enrichment of melt in H2O and SiO2 so that re-hydrated inclusions (4--5 wt% H2O) become as silica-saturated as primitive Klyuchevskoy rocks. An experimental dehydration of previously re-hydrated inclusions also resulted in coupled depletion of melt in H2O and SiO2. The estimated stoichiometry of SiO2 and H2O gain/loss is consistent with dissolution/crystallization of metal-defect olivine on inclusion walls. The migration mechanism of water is controlled by hydrogen diffusion in the octahedral metal (Mg, Fe) vacancies through olivine structure as confirmed by FTIR spectroscopy. We conclude that the previously reported SiO2-undersaturated composition of many melt inclusions from hypersthene-normative island-arc rocks can be explained by the coupled loss of up to several weight percent of H2O and SiO2 from the initially trapped primitive SiO2-saturated hydrous melts. Thus, SiO2-undersaturated melt inclusions may not be representative of primitive island-arc magmas. The discovery of the coupled SiO2 and H2O loss from inclusions allowed us to propose a method for reconstruction of the initial water content even for completely dehydrated inclusions. The results of this study may indicate that the majority of primitive island-arc inclusions have not preserved their initial H2O content, and that primary arc melts contain on average �W4 wt% H2O. The higher H2O concentration in primary arc melts implies the existence of a textquoteleftcrustal filtertextquoteright controlling the water content, which can be preserved in melt inclusions, and also the lower mantle melting temperatures and higher output H2O fluxes in subduction zones than previously estimated based on direct determination of H2O in potentially dehydrated melt inclusions.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Verdier-Paoletti_etal2019,

title = {Testing the genetic relationship between fluid alteration and brecciation in CM chondrites},

author = {M. J. Verdier-Paoletti and Y. Marrocchi and L. G. Vacher and J. Gattacceca and A. Gurenko and C. Sonzogni and M. Gounelle},

doi = {10.1111/maps.13306},

year  = {2019},

date = {2019-01-01},

journal = {Meteoritics \& Planetary Science},

volume = {54},

pages = {1692--1709},

abstract = {Boriskino is a poorly studied CM chondrite with numerous millimeter‐ to centimeter‐scale clasts exhibiting sharp boundaries. Clast textures and mineralogies attest to diverse geological histories with various degrees of aqueous alteration. We conducted a petrographic, chemical, and isotopic study on each clast type of the breccia to investigate if there exists a genetic link between brecciation and aqueous alteration, and to determine the controlling parameter of the extent of alteration. Boriskino is dominated by CM2 clasts for which no specific petrographic type could be assigned based on the chemical compositions and modal abundances of constituents. One clast stands out and is identified as a CM1 lithology, owing to its lack of anhydrous silicates and its overall abundance of dolomite‐like carbonates and acicular iron sulfides. We observe that alteration phases near clast boundaries exhibit foliation features, suggesting that brecciation postdated aqueous alteration. We measured the O‐isotopic composition of Ca‐carbonates and dolomite‐like carbonates to determine their precipitation temperatures following the methodology of Verdier‐Paoletti et al. (2017). Both types of carbonates yield similar ranges of precipitation temperatures independent of clast lithology, ranging from −13.9 textpm 22.4 (2$sigma$) to 166.5 textpm 47.3 textdegreeC, precluding that temperature alone accounts for the differences between the CM1 and CM2 lithologies. Instead, we suggest that initial water/rock ratios of 0.75 and 0.61 for the CM1 and CM2 clasts, respectively, might control the extent of aqueous alteration. Based on these estimates, we suggest that Boriskino clasts originated from a single parent body with heterogeneous distribution of water either due to local differences in the material permeability or in the initial content of ice available. These conditions would have produced microenvironments with differing geochemical conditions thus leading to a range of degrees of aqueous alteration.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sobolev_etal2019,

title = {Deep hydrous mantle reservoir provides evidence for crustal recycling before 3.3 billion years ago},

author = {A. V. Sobolev and E. V. Asafov and A. A. Gurenko and N. T. Arndt and V. G. Batanova and M. V. Portnyagin and D. Garbe-Sch\"{o}nberg and A. H. Wilson and G. R. Byerly},

doi = {10.1038/s41586-019-1399-5},

year  = {2019},

date = {2019-01-01},

journal = {Nature},

volume = {571},

abstract = {Water strongly influences the physical properties of the mantle and enhances its ability to melt or convect. Its presence can also be used to trace recycling of surface reservoirs down to the deep mantle1, which makes knowledge of the water content in the Earthtextquoterights interior and its evolution crucial for understanding global geodynamics. Komatiites (MgO-rich ultramafic magmas) result from a high degree of mantle melting at high pressures2 and thus are excellent probes of the chemical composition and water contents of the deep mantle. An excess of water over elements that show similar geochemical behaviour during mantle melting (for example, cerium) was recently found in melt inclusions in the most magnesium-rich olivine in 2.7-billion-year-old komatiites from Canada3 and Zimbabwe4. These data were taken as evidence for a deep hydrated mantle reservoir, probably the transition zone, in the Neoarchaean era (2.8 to 2.5 billion years ago). Here we confirm the mantle source of this water by measuring deuterium-to-hydrogen ratios in these melt inclusions and present similar data for 3.3-billion-year-old komatiites from the Barberton greenstone belt. From the hydrogen isotope ratios, we show that the mantle sources of these melts contained excess water, which implies that a deep hydrous mantle reservoir has been present in the Earthtextquoterights interior since at least the Palaeoarchaean era (3.6 to 3.2 billion years ago). The reconstructed initial hydrogen isotope composition of komatiites is more depleted in deuterium than surface reservoirs or typical mantle but resembles that of oceanic crust that was initially altered by seawater and then dehydrated during subduction. Together with an excess of chlorine and depletion of lead in the mantle sources of komatiites, these results indicate that seawater-altered lithosphere recycling into the deep mantle, arguably by subduction, started before 3.3 billion years ago.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kamenetsky_etal2018,

title = {Reprint of Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part II. Composition, liquidus assemblage and fractionation of the silicate melt☆},

author = {V. S. Kamenetsky and M. Zelenski and A. Gurenko and M. Portnyagin and K. Ehrig and M. Kamenetsky and T. Churikova and S. Feig},

doi = {10.1016/j.chemgeo.2017.10.026},

year  = {2018},

date = {2018-01-01},

journal = {Chemical Geology},

volume = {478},

pages = {112--130},

abstract = {Olivine-hosted inclusions of silicate and sulfide melts, Cr-spinel and pyroxene were studied to estimate magma composition, temperature, pressure, and fO2 at the onset and during the silicate-sulfide immiscibility in modern arc basalt from Tolbachik volcano, Kamchatka arc. We demonstrate that the olivine phenocrysts hosting sulfide and silicate melt inclusions belong to the same population. The compositions of the silicate melt inclusions in most primitive olivine (88--91 mol% Fo) represent moderately oxidized (textasciitildeQFM +1.1) high-MgO (up to 12--12.6 wt%) and high CaO/Al2O3 (0.8--1.2) melt that has abundances and ratios of the lithophile trace elements typical of island arc magmas. The initial volatile contents in parental Tolbachik magma are estimated from the melt inclusions and mass-balance considerations to be at least 4.9 wt% H2O, 2600 ppm S, 1100 ppm Cl, 550 ppm F, and 1200 ppm CO2. These data are used to calculate the temperature (textasciitilde1220 textdegreeC) and minimum pressure (3 kbar) at which the beginning of crystallization and exsolution of sulfide melt took place. The presence of anhydrite, especially ubiquitous in the crystallized silicate melt associated with sulfide globules, suggest that much higher sulfur abundances prior to degassing and sulfate immiscibility and/or crystallization should be expected. We tentatively considered hydrothermal accumulations of sulfur (elemental, sulfate and sulfide) in the volcanic conduit responsible for local contamination and oversaturation of the Tolbachik magma in sulfur and related sulfide immiscibility. Coexisting sulfide and sulfate can be also interpreted in favor of the magmatic sulfide oxidation and related generation of S-rich fluids. Such fluids are expected to accumulate metals releasedfrom decomposed sulfide melts and supply significant epithermal mineralization, including native gold.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tartse_etal2018,

title = {Insights into the origin of carbonaceous chondrite organics from their triple oxygen isotope composition},

author = {R. Tart`ese and M. Chaussidon and A. Gurenko and F. Delarue and F. Robert},

doi = {https://d10.1073/pnas.1808101115},

year  = {2018},

date = {2018-01-01},

journal = {PNAS},

volume = {115},

number = {34},

pages = {8535--8540},

abstract = {Dust grains of organic matter were the main reservoir of C and N in the forming Solar System and are thus considered to be an essential ingredient for the emergence of life. However, the physical environment and the chemical mechanisms at the origin of these organic grains are still highly debated. In this study, we report highprecision triple oxygen isotope composition for insoluble organicmatter isolated from three emblematic carbonaceous chondrites, Orgueil, Murchison, and Cold Bokkeveld. These results suggest that the O isotope composition of carbonaceous chondrite insoluble organic matter falls on a slope 1 correlation line in the triple oxygen isotope diagram. The lack of detectable mass-dependent O isotopic fractionation, indicated by the slope 1 line, suggests that the bulk of carbonaceous chondrite organics did not form on asteroidal parent bodies during low-temperature hydrothermal events. On the other hand, these O isotope data, together with the H and N isotope characteristics of insoluble organic matter, may indicate that parent bodies of different carbonaceous chondrite types largelyaccreted organics formed locally in the protosolar nebula, possibly byphotochemical dissociation of C-rich precursors.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Asafov_etal2018,

title = {Belingwe komatiites (2.7 Ga) originate from a plume with moderate water content, as inferred from inclusions in olivine},

author = {E. V. Asafov and A. V. Sobolev and A. A. Gurenko and N. T. Arndt and V. G. Batanova and M. V. Portnyagin and D. Garbe-Sch\"{o}nberg and S. P. Krasheninnikov},

doi = {ht10.1016/j.chemgeo.2017.11.002},

year  = {2018},

date = {2018-01-01},

journal = {Chemical Geology},

volume = {478},

pages = {39--59},

abstract = {Major and trace elements, and volatile components have been measured in melt inclusions in olivine from fresh 2.7 Ga old komatiites from the Reliance Formation of the Belingwe Greenstone Belt, Zimbabwe. Reconstructed compositions of melt inclusions contain 20--23.5 wt% MgO and up to 0.3 wt% H2O ; these compositions probably represent those of the erupted lava. In inclusions in relatively evolved (low Fo) olivines, an excess of Na2O, CaO, Li, La, Cu, Rb as well as volatile components (H2O, F, Cl and S) relative to other highly incompatible elements is attributed to assimilation of seawater altered mafic material. No assimilation signature is observed for the most primitive melt inclusions hosted in the magnesium rich olivines. The primary melt composition, estimated using melt inclusions and the composition of the most magnesian olivine (Fo 93.5), contains up to 27.5 wt% MgO and ca. 0.2 wt% H2O. The presence of H2O slightly depressed the liquidus temperature to ca. 1513 textdegreeC. Our results suggest formation of the Belingwe komatiite magma at ca. 7 GPa pressure and ca. 1790 textdegreeC temperature in a mantle plume. The plume picked up water and probably chlorine through interaction with a hydrous transition mantle zone in the way similar to that previously proposed by Sobolev et al. (2016) for komatiites in Canada.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko_etal2018,

title = {Origin of volatiles emitted by Plinian mafic eruptions of the Chikurachki volcano, Kurile arc, Russia: Trace element, boron and sulphur isotope constraints},

author = {A. A. Gurenko and E. Belousova and V. S. Kamenetsky and M. E. Zelenski},

doi = {10.1016/j.chemgeo.2017.10.009},

year  = {2018},

date = {2018-01-01},

journal = {Chemical Geology},

volume = {478},

pages = {131--147},

abstract = {Chikurachki is a 1816-m high stratovolcano on Paramushir Island, Kurile arc, Russia, which has repeatedly produced highly explosive eruptions of mafic composition. The present work is aimed at constraining the origin of volatile components (CO2, H2O, F, S, and Cl), along with B and S isotopic compositions in a series of phenocryst-hosted melt inclusions and groundmass glasses from basaltic andesite pyroclasts of the 1853, 1986, and prehistoric Plinian eruptions of the volcano. The ranges of volatile concentrations in melt inclusions (47--1580 $mu$g/g CO2, 0.4--4.2 wt% H2O, 399--633 $mu$g/g F, 619--3402 $mu$g/g S and 805--1240 $mu$g/g Cl) imply asudden pressure release from textasciitilde460 through textasciitilde35 MPa that corresponds to textasciitilde1.2--16-km-depth range of magma ascent upon decompression. We conclude that rapid ascent of the volatile-rich basaltic magmas from textasciitilde16-km initial depth accompanied by near-surface bubble nucleation and growth, and subsequent magma fragmentationappear to be a primary reason for the Plinian character of the Chikurachki eruptions. Significant negative correlations of S with K, Zr, Nb, Ba, La, Ce, Pr (R =−0.8 to −0.9), no clear relationships of S with H2O, CO2 and Cl, but strong positive correlations of S/K2O with H2O/K2O, Cl/K2O and F/K2O preclude magma degassing to be the only process affecting volatile concentrations dissolved in the melt. The $delta$34S values of the studied inclusion and groundmass glasses range from −1.6 to +12.3texttenthousand, decrease with decreasing S, show significant positive correlations with H2O/K2O, Cl/K2O and F/Zr, and negative correlations with a number of incompatible trace elements. Neither open- nor close-system magma degassing can account for the observed range of $delta$34S. The $delta$11B values of the melt inclusions range from−7.0 to+2.4texttenthousandwith 13--23 $mu$g/g B. The relationships of $delta$11B withB/K2O and B/Nb are inconsistent with magma contamination at shallow crustal depths. Linear character of 1/S vs. $delta$34S relationship suggests two-component mixing. The possible mixing end-members could be the magmas having similar major and trace element compositions, but strongly contrasting volatile contents and S isotopes.Based on the behaviour of fluid-mobile vs. fluid-immobile incompatible trace elements, we conclude that the subduction component likely represents a mixture of subduction sediment-derived melt with up to 60% of slabderived fluid. Admixture of textasciitilde1--8% of the inferred subduction component to the depleted mantle wedge sourceis required to account for the compositional range of the Chikurachki melt inclusions, and textasciitilde0.4--10% to constrain the composition of Kurile arc mafic magmas.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko+Sobolev2018,

title = {Can orthopyroxene be present in the source of Toro-Ankole, East African Rift, Kamafugites?},

author = {A. A. Gurenko and A. V. Sobolev},

doi = {10.1093/petrology/egy069},

year  = {2018},

date = {2018-01-01},

journal = {Journal of Petrology},

volume = {59},

number = {8},

pages = {1517--1550},

abstract = {We have studied mineral-hosted melt, crystal and fluid inclusions from two ugandite, one mafurite and two katungite samples from the Toro-Ankole volcanic province in the East African Rift, which is the archetypal location for kamafugitic rocks. A main finding of our study is the presence of orthopyroxene as inclusions in an early generation of olivine from all three types of kamafugites, suggesting interaction of a carbonate-rich metasomatic agent with lithospheric peridotite mantle that may have caused almost complete dissolution of orthopyroxene. This process was preceded, accompanied or followed by the formation of phlogopite--clinopyroxene veins resulting from interaction of F-rich and low H2O/CO2 metasomatic fluids with the mantle rocks, which then became the source of the Toro-Ankole kamafugites. Pressure--temperature (P--T) estimates suggest that the parental kamafugitic melts last equilibrated with their source rocks at 16+-8 kbar and 1160+-130textdegreeC. This implies that they could have originated significantly below the solidus of dry, carbonated peridotite, but above the solidus of phlogopite-bearing clinopyroxenite. We conclude that the Toro-Ankole kamafugites originated by very low degrees of partial melting at moderately oxidized conditions (�'uFMQ = +2.2+-0.4 atm log units, where FMQ is fayalite--magnetite--quartz buffer) under a high geothermal gradient of 60--80mWm-2, in response to lithospheric extension and probable association with an adjacent mantle plume. We estimate that differentiation of parental ugandite, mafurite and katungite magmas could have occurred at depths \<12km in the T range 1150--850textdegreeC. Laboratory-heated, homogenized melt inclusions trapped by a second generation of olivine and clinopyroxene are characterized by remarkable silica-undersaturation, compared with mid-ocean ridge basalt and ocean island basalt magmas, with high concentrations of alkalis, Ti, Ba, Sr and Zr, but varying to very low concentrations of Al and Ca. Such alkali-rich, strongly evolved melts might have resulted from extreme (\>95%) fractional crystallization of the parental magmas, assuming their chemical compositions to be similar to those of the respective lavas. However, this estimate is about three times higher than the modal amount of phenocrysts in the lavas that could be reinforced by the presence of excess cognate crystals and/or xenocrysts in the lavas. Strong oxidation from FMQ+2 to FMQ+4 to +5.2 atm log units of the evolved mafuritic magmas at 900--1000textdegreeC has occurred during the final stage of magma evolution at very shallow crustal depths or possibly directly in the lava flow.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zelenski_etal2018,

title = {Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts},

author = {M. Zelenski and V. S. Kamenetsky and J. A. Mavrogenes and A. A. Gurenko and L. V. Danyushevsky},

doi = {10.1016/j.chemgeo.2017.09.013},

year  = {2018},

date = {2018-01-01},

journal = {Chemical Geology},

volume = {478},

pages = {102--111},

abstract = {Silicate-sulfide liquid immiscibility plays a key role in the formation of magmatic sulfide ore deposits but incipient sulfide melts are rarely preserved in natural rocks. This study presents the distribution and compositions of olivine-hosted sulfide melt globules resulting from silicate-sulfide liquid immiscibility in primitive arc basalts. Abundant sulfide droplets entrapped in olivine from primitive basalts of the 1941 eruption and pre-historic eruptive cone textquotelefttextquoteleftMt. 1004textquoterighttextquoteright of the Tolbachik volcano, Kurile-Kamchatka arc. Inclusions range from submicron to250 $mu$m in size, coexist with sulfur-rich glass (≤1.1 wt% S), and, in some cases, with magmatic anhydrite. Saturation in sulfide occurred early in the evolution of a water- and sulfur-rich magma, moderately oxidized (QFM+1 to +1.5), which crystallized high-Mg olivine (Fo86--92), clinopyroxene and Cr-spinel. The processdeveloped dense textquotelefttextquoteleftcloudstextquoterighttextquoteright of sulfide in relatively small volumes of magma, with highly variable abundances of chalcophile metals. The low degree of sulfide supersaturation promoted diffusive equilibration of the growing droplets with the melt in Ni and Cu, resulting in high concentrations (≈38 mol%) of CuS and NiS in the earliest sulfide liquids. The Tolbachik samples provide a glimpse into deep arc processes not seen elsewhere, and may show how arc magmas, despite their oxidized nature, saturate in sulfide.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fabrega_etal2017,

title = {Predicting instrumental mass fractionation (IMF) of stable isotope SIMS analyses by response surface methodology (RSM)},

author = {C. Fabrega and D. Parcerisa and J. M. Rossell and A. Gurenko and C. Franke},

doi = {10.1039/c6ja00397d},

year  = {2017},

date = {2017-01-01},

journal = {Journal of Analytical Atomic Spectrometry},

abstract = {Instrumental mass fractionation (IMF) of isotopic SIMS analyses (CAMECA 1280HR, CRPG Nancy) was predicted by response surface methodology (RSM) for the 18O/16O determination of plagioclase, Kfeldspar, and quartz. The three predictive response surface models combined instrumental and compositional inputs. The instrumental parameters were: (i) X and Y stage positions, (ii) the values of LT1DefX and LT1DefY electrostatic deflectors, (iii) chamber pressure, and (iv) primary-ion beam intensity. The compositional inputs included: (i) anorthite content (An%) for the plagioclase model, and (ii) orthoclase (Or%) and barium (BaO%) contents for the K-feldspar model. The three models exhibited high predictive power. The coefficients R2 and prediction-R2 were, respectively, 90.47% and 86.74% forplagioclase, 87.56% and 83.17% for K-feldspar, and 94.29% and 91.59% for quartz. The results show that RSM can be confidently applied to IMF prediction in stable isotope SIMS analyses by the use of instrumental and compositional variables.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Florentin_etal2017,

title = {Origin of Na in glass inclusions hosted in olivine from Allende CV3 and Jbilet Winselwan CM2: Implications for chondrule formation},

author = {L. Florentin and F. Faure and E. Deloule and L. Tissandier and A. Gurenko and D. Lequin},

doi = {10.1016/j.epsl.2017.06.038},

year  = {2017},

date = {2017-01-01},

journal = {Earth and Planetary Science Letters},

volume = {474},

pages = {160--171},

abstract = {Glass inclusions trapped in Mg-rich olivines within type I chondrules from the Allende (CV3) and Jbilet Winselwan (CM2) chondrites were analyzed by EPMA (Electron Probe Microanalysis) for major elements and by SIMS (Secondary Ion Mass Spectrometry) for Cl and S (analyzed here for the first time in chondrule-hosted glass inclusions). The inclusions from Jbilet Winselwan are poor in Na2O, whereas those from Allende are Na-rich, displaying up to 8wt.% Na2O. The source of Na is a central issue in terms of chondrule origins because of the volatility of Na at high temperature. The wide scatter in Na2O contents of olivine-hosted glass inclusions from chondrules has led the community to propose that Na2O came from late interactions of chondrules with a Si/Na-rich gas. To gain new insights into the origins of the Na2O recorded in glass inclusions, heating experiments (up to 1810◦C) were performed on Allende inclusions in an effort to constrain the initial composition of the trapped melts. Our results demonstrate that sodium (although volatile) does not escape from inclusions during heating, thus confirming that glass inclusions behave as closed systems. Furthermore, heated olivines still bear inclusions containing up to 7.2wt.% of Na2O. Olivines are thought to form at temperatures at which Na is volatile. This implies that (1) Na from glass inclusions cannot come from condensation but rather results from trapping in a Na-rich environment, which implies a high pressure, as in a melting planetasimal (2) there may be two distinct origins for the sodium: an indigenous origin for the sodium trapped inside glass inclusions and a gaseous origin for the sodium recorded in mesostasis from chondrules. Consequently, these results are in favor of a planetesimal origin for olivine from chondrules.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Golowin_etal2017,

title = {Boninite-like intraplate magmas from Manihiki Plateau require ultra-depleted and enriched source components},

author = {R. Golowin and M. Portnyagin and K. Hoernle and F. Hauff and A. Gurenko and D. Garbe-Sch\"{o}nberg and R. Werner and S. Turner},

doi = {10.1038/ncomms14322},

year  = {2017},

date = {2017-01-01},

journal = {Nature Communications},

abstract = {The Ontong Java and Manihiki oceanic plateaus are believed to have formed through high-degree melting of a mantle plume head. Boninite-like, low-Ti basement rocks at Manihiki, however, imply a more complex magma genesis compared with Ontong Java basement lavas that can be generated by B30% melting of a primitive mantle source. Here we show that the trace element and isotope compositions of low-Ti Manihiki rocks can best be explained by re-melting of an ultra-depleted source (possibly a common mantle component in the Ontong Java and Manihiki plume sources) re-enriched by r1% of an ocean-island-basalt-like melt component. Unlike boninites formed via hydrous flux melting of refractory mantle at subduction zones, these boninite-like intraplate rocks formed through adiabatic decompression melting of refractory plume material that has been metasomatized by ocean-island-basalt-like melts. Our results suggest that caution is required before assuming all Archaean boninites were formed in association with subduction processes.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kamenetsky_etal2017,

title = {Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part II. Composition, liquidus assemblage and fractionation of the silicate melt},

author = {V. S. Kamenetsky and M. Zelenski and A. Gurenko and M. Portnyagin and K. Ehrig and M. Kamenetsky and T. Churikova and S. Feig},

doi = {10.1016/j.chemgeo.2017.09.019},

year  = {2017},

date = {2017-01-01},

journal = {Chemical Geology},

volume = {471},

pages = {92--110},

abstract = {Olivine-hosted inclusions of silicate and sulfide melts, Cr-spinel and pyroxene were studied to estimate magma composition, temperature, pressure, and fO2 at the onset and during the silicate-sulfide immiscibility in modern arc basalt from Tolbachik volcano, Kamchatka arc. We demonstrate that the olivine phenocrysts hosting sulfide and silicate melt inclusions belong to the same population. The compositions of the silicate melt inclusions in most primitive olivine (88--91 mol% Fo) represent moderately oxidized (textasciitildeQFM +1.1) high-MgO (up to 12--12.6 wt%) and high CaO/Al2O3 (0.8--1.2) melt that has abundances and ratios of the lithophile trace elements typical of island arc magmas. The initial volatile contents in parental Tolbachik magma are estimated from the melt inclusions and mass-balance considerations to be at least 4.9 wt% H2O, 2600 ppm S, 1100 ppm Cl,550 ppm F, and 1200 ppm CO2. These data are used to calculate the temperature (textasciitilde1220 textdegreeC) and minimum pressure (3 kbar) at which the beginning of crystallization and exsolution of sulfide melt took place. The presence of anhydrite, especially ubiquitous in the crystallized silicate melt associated with sulfide globules, suggest that much higher sulfur abundances prior to degassing and sulfate immiscibility and/or crystallization should be expected. We tentatively considered hydrothermal accumulations of sulfur (elemental, sulfate and sulfide) in thevolcanic conduit responsible for local contamination and oversaturation of the Tolbachik magma in sulfur and related sulfide immiscibility. Coexisting sulfide and sulfate can be also interpreted in favor of the magmatic sulfide oxidation and related generation of S-rich fluids. Such fluids are expected to accumulate metals released from decomposed sulfide melts and supply significant epithermal mineralization, including native gold.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tartse_etal2017,

title = {Warm Archean oceans reconstructed from oxygen isotope composition of early-life remnants},

author = {R. Tart`ese and M. Chaussidon and A. Gurenko and F. Delarue and F. Robert},

doi = {10.7185/55 geochemlet.1706},

year  = {2017},

date = {2017-01-01},

journal = {Geochemical Perspectives Letters},

volume = {3},

pages = {55--65},

abstract = {Deciphering the surface conditions on the Earth during Archean times (\> 2.5 billion years ago -- Ga) is crucial to constrain the conditions that promoted the development of life. The progressive shift through time of the oxygen isotopic compositions of Precambrian siliceous sediments -- the so-called cherts -- has been interpreted as indicating a secular decrease of seawater temperature by 50-80 textdegreeC from the early Archean to the present-day. However, this interpretation has been questioned, notably because it assumes that the seawater oxygen isotopic composition has remained globally constant since 3.5 Ga, though this has never been tested by direct isotopic measurements on Archean samples. Here we report measurements of the oxygen isotopic composition of carbonaceous matter indigenous to Precambrian cherts up to ca. 3.5 Ga. These new results demonstrate that the oxygen isotope composition of seawater during most of the Precambrian remained around 0 textpm 5 texttenthousand, which is consistent with the composition of present day seawater. Combined with the chert oxygen isotope composition record, this indicates that ca. 3.5 Ga ago ocean bottom-water temperatures were textasciitilde50-60 textdegreeC higher than today.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Verdier-Paoletti_etal2017,

title = {Oxygen isotope constraints on the alteration temperatures of CM chondrites},

author = {M. J. Verdier-Paoletti and Y. Marrocchi and G. Avice and M. Roskosz and A. Gurenko and M. Gounelle},

doi = {10.1016/j.epsl.2016.10.055},

year  = {2017},

date = {2017-01-01},

journal = {Earth and Planetary Science Letters},

volume = {458},

pages = {273--281},

abstract = {We report a systematic oxygen isotopic survey of Ca-carbonates in nine different CM chondrites characterized by different degrees of alteration, from the least altered known to date (Paris, 2.7--2.8) to the most altered (ALH 88045, CM1). Our data define a continuous trend that crosses the Terrestrial Fractionation Line (TFL), with a general relationship that is indistinguishable within errors from the trend defined by both matrix phyllosilicates and bulk O-isotopic compositions of CM chondrites. This bulk-matrix-carbonate (BMC) trend does not correspond to a mass-dependent fractionation (i.e., slope 0.52) as it would be expected during fluid circulation along a temperature gradient. It is instead a direct proxy of the degree of O-isotopic equilibration between 17,18O-rich fluids and 16O-rich anhydrous minerals. Our O-isotopic survey revealed that, for a given CM, no carbonate is in O-isotopic equilibrium with its respective surrounding matrix. This precludes direct calculation of the temperature of carbonate precipitation. However, the O-isotopic compositions of alteration water in different CMs (inferred from isotopic mass-balance calculation and direct measurements) define another trend (CMW for CM Water), parallel to BMC but with a different intercept. The distance between the BMC and CMW trends is directly related to the temperature of CM alteration and corresponds to average carbonates and serpentine formation temperatures of 110◦C and 75◦C, respectively. However, carbonate O-isotopic variations around the BMC trend indicate that they formed at various temperatures ranging between 50and 300◦C, with 50% of the carbonates studied here showing precipitation temperature higher than 100◦C. The average �'u17O and the average carbonate precipitation temperature per chondrite are correlated, revealing that all CMs underwent similar maximum temperature peaks, but that altered CMs experienced protracted carbonate precipitation event(s) at lower temperatures than the least altered CMs. Our data suggest that the �'u17O value of Ca-carbonates could be a reliable proxy of the degree of alteration experienced by CM chondrites.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zelenski_etal2017,

title = {Platinum-group elements and gold in sulfide melts from modern arc basalt (Tolbachik volcano, Kamchatka)},

author = {M. Zelenski and V. S. Kamenetsky and J. A. Mavrogenes and L. V. Danyushevsky and D. Matveev and A. Gurenko},

doi = {10.1016/j.lithos.2017.08.012},

year  = {2017},

date = {2017-01-01},

journal = {Lithos},

volume = {290},

pages = {172--188},

abstract = {Sulfide melt inclusions entrapped in primitive olivine phenocrysts can be used to understand the compositions of early sulfide melts that may ultimately contribute to magmatic sulfide ore deposits. Sulfide globules hosted in olivine (86--92 mol% Fo) from the Tolbachik basalt (the 1941 eruption) are characterized in terms of their major and trace element abundances using electron microscopy and LA--ICP--MS analysis. Distribution of major elements within individual sulfide globules varies from homogeneous to heterogeneous. Phases include monosulfide solid solution (MSS) and intermediate solid solution (ISS) intergrowths and exsolved lowtemperatureminerals such as pyrrhotite, pentlandite, chalcopyrite and cubanite. Trace elements (platinumgroup elements --- PGE, Ag, Te, Au, Pb and Bi) are also present in solid solution in sulfide phases and as micronsized particles (textquotelefttextquoteleftnuggetstextquoterighttextquoteright). Such nuggets of dominantly Au, Pt, Au--Pd and Pd--Te are contained randomly withinsulfide matrices or, more commonly, at phase boundaries. Nuggets are also attached to outer surfaces of sulfide globules. Concentrations of PGE in sulfides follow a log normal distribution over four orders of magnitude. The highest measured noble metal concentrations in the analyzed globules (436 ppm Au + PGE) are 13.3 ppm Au,115 ppm Pt and 299 ppm Pd, whereas 40% of globules have b15 ppm of noble metals. Gold and PGE concentrations correlate, suggesting these elements were concentrated by the same process(es). We propose that a number of anomalous concentrations of one or several noble metals in the analyzed globules can be best explained by entrapment of Au--PGE-rich particles (solid or liquid) fromthe silicate melt. Although the individual Tolbachik sulfide globules have variable PGE abundances, their mean composition resembles those of major PGEsulfide ore deposits (e.g., Norilsk, Sudbury, Platreef and Merensky Reef).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko_etal2016,

title = {Oxygen isotopes and volatile contents of the Gorgona komatiites, Colombia: A confirmation of the deep mantle origin of H2O},

author = {A. Gurenko and V. S. Kamenetsky and A. C. Kerr},

doi = {10.1016/j.epsl.2016.08.035},

year  = {2016},

date = {2016-01-01},

journal = {Earth and Planetary Science Letters},

volume = {454},

pages = {154--165},

abstract = {We report O isotopes in olivine grains (Fo89--93) and volatile contents (CO2, H2O, F, S, Cl) in olivine-hosted melt inclusions from one Gorgona picrite and five komatiites with the aim of constraining the origin of H2O in these magmas. These samples have previously been analysed for major and trace elements and volatile concentrations (H2O, S, Cl) and B isotopes in melt inclusions. A distinctive feature of the included melts is relatively high contents of volatile components and boron, which show positive anomalies in, otherwise depleted, primitive mantle normalised trace and rare earth element patterns and range in $delta$11Bfrom −11.5 to15.6textdegree/textdegreetextdegree. In this study, the olivines were systematically analysed for O isotopes (1) in the centre of grains, (2) near the grain boundaries and, (3) as close as possible to the studied melt inclusions. The majority of olivines (�`u66%) are textquotelefttextquoteleftmantletextquoterighttextquoteright-like, 4.8textdegree/textdegreetextdegree≤$delta$18O ≤5.5textdegree/textdegreetextdegree, with a subordinate but still significant number (�`u33%) above, and only 2 grains below, this range. There is no systematic difference between the central and marginal parts of the grains. Higher than textquotelefttextquoteleftmantletextquoterighttextquoteright $delta$18OOlvalues are ascribed to low-T(\<300◦C) serpentinisation along inner fractures and grain boundaries of olivine phenocrysts. The measured concentrations of volatile components in the melt inclusions corrected for the effects of post-entrapment crystallisation and H2O--CO2exsolution in inclusion shrinkage bubbles are: 286--1748$mu$g/g CO2, 0.2--0.86wt.% H2O, 48--82$mu$g/g F, 398--699$mu$g/g S and 132--198$mu$g/g Cl. They correspond to a pressure of 86 textpm44 MPaor �`u2.5-km crustal depth of olivine crystallisation. The correlations of S and, to a lesser extent, of H2O, with highly incompatible lithophile elements and the correlation of F with Cl, but no relationships of H2O with Cl, rule out shallow depth magma degassing and/or crustal contamination. Our new $delta$18Oolivine and volatile component data combined with the existing, highly variable $delta$11Bvalues for melt inclusions also support the deep mantle origin of H2O (and probably other volatiles) in the Gorgona mafic and ultramafic magmas.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tartse_etal2016,

title = {Oxygen isotope analysis of fossil organic matter by secondary ion mass spectrometry},

author = {R. Tart`ese and M. Chaussidon and A. Gurenko and F. Delarue and F. Robert},

doi = {10.1016/j.gca.2016.02.035},

year  = {2016},

date = {2016-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {182},

pages = {24--39},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Borisova_etal2016,

title = {Oxygen isotope heterogeneity of arc magma recorded in plagioclase from the 2010 Merapi eruption (Central Java, Indonesia)},

author = {A. Y. Borisova and A. A. Gurenko and C. Martel and K. Kouzmanov and A. Cathala and W. A. Bohrson and I. Pratomo and S. Sumarti},

doi = {10.1016/j.gca.2016.06.020},

year  = {2016},

date = {2016-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {190},

pages = {13--34},

abstract = {Chemical and isotopic compositions of magmatic crystals provide important information to distinguish between deep juvenile and crustal contributions. In this work, high-resolution multicollector secondary ion mass spectrometry data reveal strong variations of d18O values in three plagioclase crystals (800--1700 lm) from two representative basaltic andesite samples of the 2010 Merapi eruption (Central Java, Indonesia). The d18O values (from 4.6texttenthousand to 7.9texttenthousand) are interpreted to reflect oxygen isotope heterogeneity in the melt composition during plagioclase growth. The lowest d18O values (4.6--6.6texttenthousand) are found in anorthite-rich cores (An82--97), whereas higher d18O values (5.7--7.9texttenthousand) are found in anorthite-poorer zones (An33--86), typically in crystal rims. Combining these new plagioclase d18O data with d18O of calc-silicate crustal xenoliths erupted between 1994 and 1998, the composition of glass inclusions hosted by the anorthite-rich plagioclase (An82--92), available experimental data, and the results of thermodynamic modeling using the Magma Chamber Simulator code, we conclude that the abundant anorthite-rich cores crystallized from a mantle-derived hydrous basaltic to basaltic trachyandesite melt that recharged a deeper (200--600 MPa) magma storage zone, whereas lower anorthite zones crystallized at shallower levels (100--200 MPa). The oxygen isotope variations in the plagioclase are explained by a two-stage model of interaction of the hydrous, mafic mantlederived magma (1) with old crustal rocks depleted in 18O due to high temperature alteration that yielded the low d18O values in the anorthite-rich cores at deep levels (13--20 km), and later (2) with 18O-enriched carbonate material that yielded the high d18O values in anorthite-poorer zones at shallow levels (�`u4.5--9 km). Thermodynamic modeling is consistent with �`u18 wt.% assimilation of crustal calc-silicate material at 925--950 textdegreeC and 100--200 MPa by the 2010 Merapi basaltic andesite magma prior to eruption. Timescales for plagioclase phenocryst growth and residence in the magmatic plumbing system are 634 years. The combined data thus reveal efficient magma recharge and crustal assimilation processes that characterize the open-system magma storage and transport systems associated with the 2010 Merapi eruption.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{France_etal2016,

title = {Oxygen isotopes reveal crustal contamination and a large, still partially molten magma chamber in Cha^ine des Puys (French Massif Central)},

author = {L. France and M. Demacon and A. A. Gurenko and D. Briot},

doi = {10.1016/j.lithos.2016.05.013},

year  = {2016},

date = {2016-01-01},

journal = {Lithos},

volume = {260},

pages = {328--338},

abstract = {The two main magmatic properties associated with explosive eruptions are high viscosity of silica-rich magmas and/or high volatile contents. Magmatic processes responsible for the genesis of such magmas are differentiation through crystallization, and crustal contamination (or assimilation) as this process has the potential to enhance crystallization and add volatiles to the initial budget. In the Cha^ine des Puy series (FrenchMassif Central), silica and H2O-rich magmas were only emitted during the most recent eruptions (ca. 6--15 ka). Here, we use in situ measurements of oxygen isotopes in zircons from two of the main trachytic eruptions from the Cha^ine des Puys to track the crustal contamination component in a sequence thatwas previously presented as an archetypal fractional crystallization series. Zircons from Sarcoui volcano and Puy de D^ome display homogeneous oxygen isotope compositions with $delta$18O = 5.6 textpm 0.25texttenthousand and 5.6 textpm 0.3texttenthousand, respectively, and have therefore crystallized from homogeneous melts with $delta$18Omelt = 7.1 textpm 0.3texttenthousand. Compared to mantle derived melts resulting from pure fractional crystallization ($delta$18Odif.mant. = 6.4 textpm 0.4texttenthousand), those $delta$18Omelt values are enriched in 18O and support a significant role of crustal contamination in the genesis of silica-rich melts in the Cha^ine des Puys. Assimilation--fractional--crystallization models highlight that the degree of contamination was probably restricted to 5.5--9.5% with Rcrystallization/Rassimilation varying between 8 and 14. The very strong intra-site homogeneity of the isotopic data highlights that magmas were well homogenized before eruption, and consequently that crustal contamination was not the trigger of silica-rich eruptions in the Cha^ine des Puys. The exceptionally strong inter-site homogeneity of the isotopic data brings to light that Sarcoui volcano and Puy de D^ome were fed by a single large magma chamber. Our results, together with recent thermo-kinetic models and an experimental simulation (Martel et al., 2013), support the existence of a large (textasciitilde6--15 km3), still partially molten mid-crustal reservoir (10--12 km deep) that is filled with silica-rich magma},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sobolev_etal2016,

title = {Komatiites reveal a hydrous Archaean deep-mantle reservoir},

author = {A. V. Sobolev and E. V. Asafov and A. A. Gurenko and N. T. Arndt and V. G. Batanova and M. V. Portnyagin and D. Garbe-Sch\"{o}nberg and S. P. Krasheninnikov},

doi = {10.1038/nature17152},

year  = {2016},

date = {2016-01-01},

journal = {Nature},

volume = {628},

number = {531},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Mironov_etal2015,

title = {Quantification of the CO2 budget and H2O--CO2 systematics in subduction-zone magmas through the experimental hydration of melt inclusions in olivine at high H2O pressure},

author = {N. Mironov and M. Portnyagin and R. Botcharnikov and A. Gurenko and K. Hoernle and F. Holtz},

doi = {10.1016/j.epsl.2015.05.043},

year  = {2015},

date = {2015-01-01},

journal = {Earth and Planetary Science Letters},

volume = {425},

pages = {1--11},

abstract = {Reliable evaluation of CO2 contents in parental arc magmas, which can be preserved in melt inclusions in phenocrysts, is required to verify the proposed efficiency of CO2 recycling at convergent margins. Quantification of bulk CO2 concentration in melt inclusions requires their complete homogenization. Using samples from lavas from the Bulochka vent of Klyuchevskoy Volcano (Kamchatka), we applied a novel experimental approach to homogenize and re-equilibrate naturally dehydrated (\<1wt.% H2O) melt inclusions from high-Fo (85--91mol.%) olivine. The experiments were performed at temperatures of 1150--1400◦C, pressures of up to 500 MPa, under dry to H2O-saturated conditions and with oxygen fugacity ranging from CCO to QFM+3.3. No homogenization was achieved at dry conditions. Complete dissolution of fluid bubbles (homogenization) in the melt inclusions was achieved at H2O pressures of 500 MPa and temperature of 1150◦C, when water content in the melt inclusions reached 4--5wt.% H2O. The CO2content in the homogenized inclusions is 3800 textpm140ppm and CO2/Nb =3000 textpm420, which are the highest values reported so far for the typical middle-K primitive arc melts and fall within the range of values inferred from the magmatic flux and volcanic gas data for primary arc magma compositions. About 83% of the CO2in Klyuchevskoy magmas is likely to be derived from the subducting slab and can be attributed to flux melting with a fluid having a CO2/H2O ratio of �`u0.06. The H2O and CO2 contents in the melt inclusions after hydrous experiments were found to correlate positively with each other and negatively with the volume of fluid bubble, reflecting increasing internal pressure in melt inclusions with increasing melt hydration. Therefore, similar trends observed in some natural sets of melt inclusions can be attributed to a partial dehydration of melts after entrapment, operating simultaneously with or following post-entrapment crystallization. Our study implies that the process of post-entrapment dehydration can be completely reversed under high pressure experimental conditions. If temperature, redox conditions and pressure of melt inclusion entrapment can be independently estimated, then our novel experimental approach (homogenization at high H2O pressure) can be used to reconstruct the initial CO2 content and also the entire composition of melt inclusions in olivine, including their initial H2O content, from any type of volcanic rock. With this approach volatiles in ancient lavas can also be determined, expanding our knowledge of volatile recycling further back in Earth history.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko_etal2015,

title = {To the origin of Icelandic rhyolites: insights from partially melted leucocratic xenoliths},

author = {A. A. Gurenko and I. N. Bindeman and I. A. Sigurdson},

doi = {10.1007/s00410-015-1145-4},

year  = {2015},

date = {2015-01-01},

journal = {Contributions to Mineralogy and Petrology},

volume = {169},

pages = {49},

abstract = {We have studied glass-bearing leucocratic (granitic to Qz-monzonitic) crustal xenoliths from the Tindfj\"{o}ll Pleistocene volcanic complex, SW Iceland. Thexenoliths consist of strongly resorbed relicts of anorthitic plagioclase, K-rich feldspar and rounded quartz in colorless through pale to dark-brown interstitial glass. Spongy clinopyroxene and/or rounded or elongated crystals of orthopyroxene are in subordinate amount. Magnetite, ilmenite, zircon, apatite, allanite and/or chevkinite are accessory minerals. The xenoliths more likely are relicts of earlier-formed, partially melted Si-rich rocks or quartz--feldspar-rich crystal segregations, which suffered latter interaction with hotter and more primitive magma(s). Icelandic lavas are typically low in $delta$18O compared to mantlederived,textquotelefttextquoteleftMORBtextquoterighttextquoteright-like rocks (textasciitilde5.6 textpm 0.2 texttenthousand), likely due to their interaction with, or contamination by, the uppercrustal rocks affected by rain and glacial melt waters.Surprisingly, many quartz and feldspar crystals and associated colorless to light-colored interstitial glasses of the studied xenoliths are not low but high in $delta$18O (5.1--7.2 texttenthousand, excluding three dark-brown glasses of 4--5 texttenthousand). The xenoliths contain abundant, low- to high-$delta$18O (2.4--6.3 texttenthousand) young zircons (U--Pb age 0.2--0.27 textpm 0.03 Ma; U--Th age 0.16 textpm 0.07 Ma), most of them in oxygen isotope equilibrium with interstitial glasses. The $delta$18O values \>5.6 texttenthousand recorded in the coexisting zircon, quartz, feldspar and colorless interstitial glass suggest crystallization frommelts produced by fusion of crustal rocks altered by seawater, also reflecting multiple melting and crystallization events. This suggests that textquotelefttextquoteleftnormaltextquoterighttextquoteright-$delta$18O silicic magmas may not be ultimately produced by crystallization of mafic, basaltic magmas. Instead, our new single-crystal laser fluorination and ion microprobe O-isotope data suggest addition of diverse partial crustal melts, probably originated from variously altered and preconditioned crust.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fri_etal2014,

title = {New evidence for chondritic lunar water from combined D/H and noble gas analyses of single Apollo 17 volcanic glasses},

author = {E. F\"{u}ri and E. Deloule and A. Gurenko and B. Marty},

doi = {10.1016/j.icarus.2013.10.029},

year  = {2014},

date = {2014-01-01},

journal = {Icarus},

volume = {229},

pages = {109--120},

abstract = {In order to assess the proportion of solar, cosmogenic, and indigenous water (hydrogen) trapped in individual Ti-rich lunar volcanic glasses (LVGs) from the 74002 core obtained during the Apollo 17 mission, we coupled ion microprobe measurements of water abundances and D/H ratios with CO2 laser extraction-static mass spectrometry analyses of noble gases (He, Ne, Ar). The large (300--400 lm in diameter) LVGs studied here contain a small amount of solar wind (SW) volatiles implanted at the grain surfaces, as indicated by the small concentrations of solar helium and neon that represent 65% of the respective totalnoble gas abundances. The large proportion of volume-correlated cosmogenic gases reflects an exposure duration of 28 Ma, on average, of the glasses at the lunar surface. Hydrogen abundances determined in the grain interiors of glassy and partially-crystalline LVGs are equivalent to between 6.5 and 54.3 ppm H2O. Based on the noble gas exposure ages, the correction of the measured hydrogen isotope composition for in situ production of cosmogenic deuterium by spallation reactions varies between 5texttenthousandto 254texttenthousandfor the different grains. Corrected dD values range from +38texttenthousand to +809texttenthousand in the LVGs and are anti-correlated with the water content, consistent with extensive hydrogen isotope fractionation during kinetic H2 lossfrom a lunar melt with an inferred initial isotope signature of the order of 100texttenthousand and a water content of 100--300 ppm. The detection of water in these primitive lunar melts confirms the presence of a nonanhydrous mantle reservoir within the Moon. Furthermore, our results reveal that the hydrogen isotope composition of water in the melt source of the 74002 LVGs is similar to that of carbonaceous chondrites. These observations indicate that the contribution of deuterium-enriched cometary water to the Earth-- Moon system is negligible.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gilbert_etal2014,

title = {Optimisation of laser parameters for the analysis of sulphur isotopes in sulphide minerals by laser ablation ICP-MS},

author = {S. E. Gilbert and L. V. Danyushevsky and T. Rodemann and N. Shimizu and A. Gurenko and S. Meffre and H. Thomas and R. R. Large and D. Death},

doi = {10.1039/c4ja00011k},

year  = {2014},

date = {2014-01-01},

journal = {Journal of Analytical Atomic Spectrometry},

volume = {29},

pages = {1042},

abstract = {The effects of laser type (Nd:YAG and excimer lasers) and their analytical parameters on 34S/32S isotopic fractionation during LA-ICP-MS analysis were investigated. Laser fluence has a larger fractionation effect when ablating pyrite with the New Wave Nd:YAG 193 nm laser, compared to the Resonetics 193 nm excimer laser which did not produce significant fractionation over the same range of fluence (1.3--3.7 J cm-
2). Matrix effects occurred between pyrite and bornite on both laser systems, especially at low fluence. However, matrix effects can be reduced with increasing fluence lessening the need for matrix matched reference materials. The effects of interface tubing configuration were also investigated andthe addition of a textquoteleftsquidtextquoteright mixing device, a coil of small diameter Tygon tubing and a small volume glass bulb, was found to improve signal precision and reproducibility and decrease the washout time of the S signal between analyses. The degassing of air from the inner surfaces of the interface tubing can produce significant isotopic drift (8\& h
1), hence flushing the tubing prior to analyses is crucial for reproducible analyses. The isotopic composition and homogeneity of a range of sulphide minerals were characterised for use as potential reference materials. We present preliminary data for a large, isotopically homogeneous pyrite crystal (PPP-1) which could be considered as a new isotopic reference material (d34SV-CDT=5.3 +- 0.2 0/00).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko_etal2013,

title = {A composite, isotopically-depleted peridotite and enriched pyroxenite source for Madeira magmas: Insights from olivine},

author = {A. A. Gurenko and J. Geldmacher and K. A. Hoernle and A. V. Sobolev},

doi = {10.1016/j.lithos.2013.03.002},

year  = {2013},

date = {2013-01-01},

journal = {Lithos},

volume = {170-171},

pages = {224--238},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Bindeman_etal2012,

title = {Silicic magma petrogenesis in Iceland by remelting of hydrothermally altered crust based on oxygen isotope diversity and disequilibria between zircon and magma with implications for MORB},

author = {I. Bindeman and A. Gurenko and T. Carley and C. Miller and E. Martin and O. Sigmarsson},

doi = {10.1111/j.1365-3121.2012.01058.x},

year  = {2012},

date = {2012-01-01},

journal = {Terra Nova},

volume = {24},

number = {3},

pages = {227--232},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko+Kamenetsky2011,

title = {Boron isotopic composition of olivine-hosted melt inclusions from Gorgona komatiites, Colombia: New evidence supporting wet komatiite origin},

author = {A. A. Gurenko and V. S. Kamenetsky},

doi = {10.1016/j.epsl.2011.09.033},

year  = {2011},

date = {2011-01-01},

journal = {Earth and Planetary Science Letters},

volume = {312},

number = {1-2},

pages = {201--212},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko_etal2010,

title = {Oxygen isotope heterogeneity of the mantle beneath the Canary Islands: Insights from olivine phenocrysts},

author = {A. Gurenko and M. Chaussidon and I. Bindeman},

year  = {2010},

date = {2010-01-01},

journal = {Contributions to Mineralogy and Petrology},

pages = {1--15},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Bindeman_etal2008,

title = {Oxygen isotope heterogeneity and disequilibria of olivine crystals in large volume Holocene basalts from Iceland: Evidence for magmatic digestion and erosion of Pleistocene hyaloclastites},

author = {I. Bindeman and A. Gurenko and O. Sigmarsson and M. Chaussidon},

doi = {10.1016/j.gca.2008.06.010},

year  = {2008},

date = {2008-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {72},

pages = {4397--4420},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko+Chaussidon2002,

title = {Oxygen isotope variations in primitive tholeiites of Iceland: evidence from a SIMS study of glass inclusions, olivine phenocrysts and pillow rim glasses},

author = {A. A. Gurenko and M. Chaussidon},

year  = {2002},

date = {2002-01-01},

journal = {Earth and Planetary Science Letters},

volume = {205},

pages = {63--79},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko_etal2001,

title = {Magma ascent and contamination beneath one intraplate volcano : evidence from S and O isotopes in glass inclusions and their host clinopyroxenes from Miocene basaltic hyaloclastites southwest of Gran Canaria (Canary Islands)},

author = {A. A. Gurenko and M. Chaussidon and H. U. Schmincke},

doi = {10.1016/S0016-7037(01)00737-2},

year  = {2001},

date = {2001-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {65},

number = {23},

pages = {4359--4374},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko+Chaussidon1997,

title = {Boron concentrations and isotopic composition of the Icelandic mantle : evidence from glass inclusions in olivine},

author = {A. A. Gurenko and M. Chaussidon},

year  = {1997},

date = {1997-01-01},

journal = {Chemical Geology},

volume = {135},

pages = {21--34},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko_etal1996,

title = {Evolution of parental magmas of Miocene shield basalts of Gran Canaria (Canary islands): constraints from crystal, melt and fluid inclusions in minerals},

author = {A. A. Gurenko and T. H. Hansteen and H. U. Schmincke},

year  = {1996},

date = {1996-01-01},

journal = {Contributions to Mineralogy and Petrology},

volume = {124},

pages = {422--435},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gurenko+Chaussidon1995,

title = {Enriched and depleted primitive melts included in olivine from Icelandic tholeiites : origin by continuous melting of a single mantle column},

author = {A. Gurenko and M. Chaussidon},

year  = {1995},

date = {1995-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {59},

pages = {2905--2917},

keywords = {},

pubstate = {published},

tppubtype = {article}

}