Évènements

Coevolution of crustal maturation and surface environments based on the triple oxygen isotope records of surface archives

Abstract: Sometimes during the Archean, Earth shifted from an early “water world” to a hypsometrically bimodal planet, where subaerial continents emerged. The available sedimentological record of shales, glacial diamictites, and detrital zircon provides isotopic and petrological insights showing that the crust was becoming more silicic and exposed as it evolved over time, primarily driven by planetary cooling and the start of horizontal tectonics. The critical tipping point of emergence was reached at the end of the Archean with the formation of the first supercontinent. Exposed large swaths of subaerial crust, initiated surface weathering as an important new geochemical flux regulating climate, and influenced the proliferation of lifeforms on early Earth via habitat creation.

Satellites et modèles climatiques au service des pôles : des plateformes de glace en Antarctique aux projections climatiques au Groenland

Late Paleozoic oxygenation of marine environments supported by dolomite U-Pb dating
amphithéâtre du CRPG

• Maëlle Duval (encadrée par Marine Paquet et Sune Nielsen) – Zn and Mg isotope systematics in subduction zones: tracing crustal recycling and carbon transfer
• Jules Augiron (encadré par Marine Paquet et Yves Marrocchi) – A multi-isotopic approach to the structure of the protoplanetarydisk and dust transfer betweenits reservoirs

Matthieu Sanchez will talk about Volatiles in the Talkeetna arc (Alaska).

The talk and discussion will be in english.

Les minéraux de fer : des temoins de l’évolution paléoenvironmementale de la zone critique tropicale
Amphithéâtre du CRPG

Waël Nazha will talk about the East African Rift System (EARS): Cradle of Life, Heat and Resources – What Can Noble Gases Tell Us?

The talk and discussion will be in english.

TBD
Amphithéâtre du CRPG

• Lisa Cadoux (encadrée par Lyderic France et Satish Singh) – Igneous Processes During Lower Crust Accretion at Fast-Spreading Oceanic Ridges
• Alizé Longeau (encadrée par David Bekaert et Guillaume Paris) –

From Terrestrial Analogues to Lunar Surface Exploration: Geological Characterization, Remote Sensing, and ISRU Perspectives
Amphithéâtre du CRPG