帕米尔高原大陆地壳俯冲及岩石圈拆沉

袁晓晖 资深科学家

德国地球科学中心（GFZ）

2023.10.27（星期五）15:00，理科二号楼2821

报告摘要：

        The Pamir–Hindu Kush orogenic belts are the most fascinating features of the westernmost Indo–Asia collision system with a rigorous intermediate-depth seismic zone within a continental setting down to a depth of 300 km, induced by two-sided subduction of the colliding Indian and Asian plates. Recent seismological studies revealed a downgoing Asian continental crust beneath the Pamir, characterized by a southerly dipping low-velocity zone with a thickness of 10-15 km, accurately following the intermediate-depth earthquakes to a depth of ~150 km. The talk will introduce the seismological studies in the past decade and focus on crustal structure along the boundary between the Pamir and Tien Shan. I will show that the south-dipping Asian slab beneath the Pamir is part of a double-sided subduction triggered by lithospheric delamination of the former Alai Valley Basin that once existed between the Tarim and Tajik basins. This also implies that the Pamir Salient was not an inherited feature of the Asian continental plate, but was created in the Cenozoic by the collision of the Indian promontory with Asia.

报告人介绍：

   袁晓晖，1986年本科毕业于中国科学技术大学，1989年硕士毕业于中国科学院地球物理研究所，1999年博士毕业于德国柏林自由大学。现为德国地球科学中心（GFZ）资深科学家。主要从事地球深部结构和性质的地球物理探测和多学科综合研究，在高精度地震学成像方法、洋-陆/陆-陆汇聚过程等研究领域取得了系统性成果。在Nature, Science，Nature Communications, EPSL, GRL, JGR等国际刊物发表论文130多篇，总引12200多次，h-index 54。