报告时间：2018年10月29日（周一）下午 3:00-4:00
报告地点：天津大学第16教学楼221
主讲嘉宾：Nathalie Vigier博士，法国Villefranche Oceanographic Laboratory（LOV）实验室
嘉宾简介：
Dr. Nathalie Vigier, the director of research group in Villefranche Oceanographic Laboratory (LOV). She got her PhD’s degree in 2000 from Institut de Physique du Globe de Paris and Université Paris 7, as a research scientist of Centre de Recherches Pétrographiques et Géochimiques in Nancy from 2003 to 2013, a research scientist of LOV from 2013 to 2017, and since 2017, she is the research director of LOV. The LOV's current contract (2014-2018) defines its statute as a research and teaching unit of both the Université Pierre et Marie Curie (UPMC) and the French National Science Center (CNRS). So far, she has published up to 48 peer reviewed publications, including 2 chapters in Handbook of Environmental Isotope Geochemistry, 10 EPSL, 11 GCA, 1 Geology, 6 Chem Geology, 3 G3, h-index is about 24, total citation is more than 1,600. She have given more than 18 topic presentations or oral presentations in AIG or Goldschmidts.
报告摘要：
The magnitude and the nature of the links between weathering and climate are still under debate. In particular, the timescale over which chemical weathering may respond to climate change is yet to be determined at the continental scale. We will present a synthesis of several works recently performed in the Nile Basin, which strongly suggests rapid and significant variations of silicate weathering, and a dominant role of monsoon and precipitation variations in this region. Our approach is based on the coupling of a weathering tracer (lithium isotopes) and a source tracer (neodymium isotopes) measured in the clay-fraction of sediments carried by rivers. The Nile Basin contain very contrasted regions in term of geology and Nd isotopes, thus allowing a precise determination of the sediment and of the clay provenance. We followed three axes: (1) determining Li-Nd isotope records at a high temporal resolution since 110 kyr, (2) comparison of delta?c records with downstream lake records and (3) understanding key weathering processes at play at present in the Blue Nile region, the major provider of sediments to the Nile, and their impact on Li isotope composition of river clays.
