Massive lithospheric delamination in southeastern Tibet facilitating continental extrusion

Author:

Feng Jikun1ORCID,Yao Huajian123,Chen Ling45ORCID,Wang Weitao6

Affiliation:

1. Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

2. CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei 230026, China

3. Mengcheng National Geophysical Observatory, University of Science and Technology of China, Mengcheng 253500, China

4. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

5. CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China

6. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

Abstract

Abstract Significant left-lateral movement along the Ailao Shan-Red River fault accommodated a substantial amount of the late Eocene to early Miocene India-Asia convergence. However, the activation of this critical strike-slip fault remains poorly understood. Here, we show key seismic evidence for the occurrence of massive lithospheric delamination in southeastern Tibet. Our novel observation of reflected body waves (e.g. P410P and P660P) retrieved from ambient noise interferometry sheds new light on the massive foundered lithosphere currently near the bottom of the mantle transition zone beneath southeastern Tibet. By integrating the novel seismic and pre-existing geochemical observations, we highlight a linkage between massive lithospheric delamination shortly after the onset of hard collision and activation of continental extrusion along the Ailao Shan-Red River fault. This information provides critical insight into the early-stage evolution of the India-Asia collision in southeastern Tibet, which has significant implications for continental collision and its intracontinental response.

Funder

National Natural Science Foundation of China

Chinese Academy of Sciences

Publisher

Oxford University Press (OUP)

Subject

Multidisciplinary

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