报告题目：Mantle transition zone beneath the central Tien Shan: possible lithospheric delamination and mantle plumes

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应邓阳凡副研究员和孙新蕾研究员邀请，俄罗斯科学院地球物理研究所Lev Vinnik教授近期访问我所，并将于本周三做“同位素室学术报告”2017年第41次报告。欢迎大家参加并积极参与讨论！
报告题目：Mantle transition zone beneath the central Tien Shan: possible lithospheric delamination and mantle plumes
报 告 人 ： Prof. Lev Vinnik（俄罗斯科学院地球物理研究所）
报告时间：11月22日（周三）上午10:00
报告地点：综合楼701会议室
报告人简介:
Lev Vinnik 教授，主要从事地震学，构造地球物理，地球动力学方面的研究。欧洲科学院院士，AGU Fellow, EGU Gutenberg medal获得者，美国地震学会Reid medal 获得者。
报告摘要:
We investigate structure of the mantle transition zone (MTZ) under the central Tien Shan by using recordings of seismograph stations in Kyrgyzstan, Kazakhstan and adjacent North-western China. Our data reveal a reduction of thickness of the MTZ of 10 - 15 km under the Fergana basin, in the neighborhood of the region of small-scale basaltic volcanism at the time near the Cretaceous-Paleogene boundary. The reduced thickness of the MTZ is the effect of a depressed 410-km discontinuity, similar to that found in many hotspots. This depression suggests a positive temperature anomaly of about 100- 150 K, consistent with the presence of a thermal mantle plume. A similar depression on the 410-km discontinuity is found under part of the Tarim basin.