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Massive lithospheric delamination in southeastern Tibet facilitating continental extrusion

National Science Review 2022年第4期9卷 23-32页

作者： Jikun Feng Huajian Yao Ling Chen Weitao Wang Laboratory of Seismology and Physics of Earth's Interior School of Earth and Space SciencesUniversity of Science and Technology of China CAS Center for Excellence in Comparative Planetology University of Science and Technology of China Mengcheng National Geophysical Observatory University of Science and Technology of China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences CAS Center for Excellence in Deep Earth Science Institute of Geophysics China Earthquake Administration

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-Re d 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.

关键词： ambient noise interferometry reflected body waves lithospheric delamination India-Asia collision Indochina extrusion

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Imaging mantle transition zone discontinuities in southwest China from dense array ambient noise interferometry

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Earthquake Science 2018年第5期31卷 301-310页

作者： Jikun Feng Huajian Yao Weitao Wang Laboratory of Seismology and Physics of Earth's Interior School of Earth and Space SciencesUniversity of Science and Technology of China Mengcheng National Geophysical Observatory University of Science and Technology of China Institute of Geophysics China Earthquake Administration

body waves retrieved from ambient noise cross-correlation functions（NCFs） have been reported by more and more recent studies in addition to the dominant recovered surface waves. And one of important applications of these recovered body waves is to investigate the structure of discontinuities within the mantle transition zone（MTZ）. In this study, clear body wave phases reflected from the MTZ discontinuities at 410 km and 660 km have been observed on the NCFs in the frequency band of 0.1–0.2 Hz from a dense regional seismic array in southwest China. The original timedomain reflected signals in the NCFs were first converted to the depth-domain NCFs based on a velocity model before they were further stacked spatially within different bins. Then the depth-domain NCFs were stacked to investigate the lateral variations of the MTZ discontinuities, that is, the 410-km and 660-km discontinuities. Our results exhibit a simple and lateral coherent P;P phase and a much more complicated P;P phase along two profiles, which are in good agreement with mineralogical prediction and recent receiver function studies in the same area. This interferometric method can provide stable reflected body wave phases mainly in the frequency band 0.1–0.2 Hz due to the secondary microseism noise, which can be potentially used for high-resolution mantle interface imaging. This approach is also a good complement to traditional imaging methods, such as receiver function imaging.

关键词： ambient noise interferometry mantle transition zone 410-km and 660-km discontinuities reflected body waves southwest China

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