Prof. Dr. Audrey Bouvier is a cosmochemist at the Bavarian Research Institute of Experimental Geochemistry & Geophysics. She obtained her first degree at the Université Blaise Pascal, Clermont-Ferrand and her PhD at the Ecole Normale Supérieure de Lyon. Her research focuses on understanding the origin, formation, and impact histories of planetary bodies within the inner Solar System through petrological, chemical, and isotopic studies. She got the Ontario Early Researcher Award in 2016 and was elected a Fellow of the Meteoritical Society in 2018. Her researches were published in Nature, Science, Nature Geoscience, PNAS, GCA, EPSL, etc.
Content Abstract:
U-Pb geochronology is an important tool for constraining the timescales of planetary processes. We recently found the oldest micro-zircons in a norite clast in an Apollo 17 impact melt breccia with an average 207Pb/206Pb age of 4453 ± 34 Ma which were analyzed by nano-SIMS and SIMS at CAS. Our results push the timing of the solidification of the lunar crust to within at least the first 100 Myr of the formation of the solar system. This age places a critical age bracket on the timing of the Giant Impact, subsequent lunar magma ocean crystallization, and the onset of Mg-suite magmatism to between 4.51 and 4.46 Ga. After crust formation, the Moon’s surface began recording a history of bombardments. We analyzed several impact melt breccias from the Apollo and meteorite collections providing new constraints on the sources of these materials and possible formation ages of major impact basins.
Mar.13th 10:00 AM
Location: D1 No.5 Meeting Room
