Objectif This project aims to directly constrain the melting history and composition of the mantle of the Earthfor the first 750 Ma of its history. So far, our limited knowledge hinges on isolated detrital zircons fromArchean crustal rocks. They indicate crustal extraction as early as 4.4 Ga with peaks at 4.0 and 4.3 Ga butreveal conflicting models for the composition of the Hadean mantle. Both the timing and extent of theseearly crust formation events and the composition of the Hadean mantle have crucial implications for ourunderstanding of the Early Earth’s chemical evolution and dynamics as well as crustal growth and thermalcooling models. Sulfides (BMS) and platinum group minerals (PGM) may hold the key to these fundamentalissues, as they are robust time capsules able to preserve the melting record of their mantle source overseveral billion years.I propose to perform state-of-the-art in-situ Pt-Re-Os isotopic measurements on an extensivecollection of micrometric BMS and PGM from Archean cratonic peridotites and chromite deposits, andpaleoplacers in Archean sedimentary basins. For the first time, < 20 μm minerals will be investigated for Pt-Re-Os. The challenging but high-resolution micro-drilling technique will be developed for in-situ samplingof the PGM and BMS with subsequent high-precision 187Os-186Os isotopic measurements by NTIMS. Thishighly innovative project will be the first to constrain Hadean Earth history from the perspective of theEarth’s mantle. By opening a new window towards high-precision geochemical exploration for micrometricminerals, this project will have long-term implications for the understanding of the micro to nano-scaleheterogeneity of isotopic signatures in the Earth’s mantle and in extra-terrestrial materials. Champ scientifique lettreshistoire et archéologiehistoiresciences naturellessciences chimiqueschimie inorganiquemétal de transition Programme(s) FP7-IDEAS-ERC - Specific programme: "Ideas" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013) Thème(s) ERC-SG-PE10 - ERC Starting Grant - Earth system science Appel à propositions ERC-2010-StG_20091028 Voir d’autres projets de cet appel Régime de financement ERC-SG - ERC Starting Grant Coordinateur RHEINISCHE FRIEDRICH-WILHELMS-UNIVERSITAT BONN Adresse Regina pacis weg 3 53113 Bonn Allemagne Voir sur la carte Région Nordrhein-Westfalen Köln Bonn, Kreisfreie Stadt Type d’activité Higher or Secondary Education Establishments Contact administratif Daniela Sprinkmeier (Mrs.) Chercheur principal Ambre Luguet (Dr.) Liens Contacter l’organisation Opens in new window Site web Opens in new window Contribution de l’UE € 1 306 742,80 Bénéficiaires (1) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire RHEINISCHE FRIEDRICH-WILHELMS-UNIVERSITAT BONN Allemagne Contribution de l’UE € 1 306 742,80 Adresse Regina pacis weg 3 53113 Bonn Voir sur la carte Région Nordrhein-Westfalen Köln Bonn, Kreisfreie Stadt Type d’activité Higher or Secondary Education Establishments Contact administratif Daniela Sprinkmeier (Mrs.) Chercheur principal Ambre Luguet (Dr.) Liens Contacter l’organisation Opens in new window Site web Opens in new window