报告地点：教学行政楼 706 会议室
报告时间：2024-09-20 从 14:00 到 16:30
报告人：Irina M. Artemieva（SinoProbe, CAGS, Beijing, China；GEOMAR Helmholtz Center, Kiel, Germany）
报告人简介：
Irina M. Artemieva是国际知名的地球科学家，为欧洲科学院院士，丹麦皇家科学院院士，美国地质学会(GSA)会士，英国皇家天文学会(RAS)会士。目前担任Journal of Geodynamics主编，曾经担任欧洲地球科学联合会(EGU)主席。
报告题目：Thermo-chemical heterogeneity of cratonic lithosphere and craton reworking
报告内容简介
Cratons are commonly considered as stable parts of continents that can survive a long-term interaction with mantle convective instabilities, basal drag and plate tectonic processes. However, geochemical evidence, geophysical observations and numerical modeling question their long-term stability and suggest heterogeneous modification with possible partial destruction of cratonic lithosphere. Cratonic modification may be identified either from a significant reduction in lithospheric thickness or from densification of cratonic lithospheric mantle, e.g. through melt-metasomatism. Both characteristics can be identified through geophysical modeling, which allows to constrain thermo-compositional heterogeneity of cratonic lithospheric mantle. The examples from the East European, Greenland, Siberian, North China, and Kaapvaal-Zimbabwe cratons, as well as the Arabian Shield, Tibet and Antarctica demonstrate various degrees of lithosphere reworking by mantle convective instabilities and plate tectonics processes. The observed broad variability in the present-day cratonic lithosphere structure precludes unique interpretations of past interactions of the cratons with mantle convection and plate tectonics processes, and indicates the existence of various types and multiple phases of such interactions, controlled by lithosphere rheology.