Direct structural evidence of Indian continental subduction beneath Myanmar

被引:75
|
作者
Zheng, Tianyu [1 ]
He, Yumei [1 ,2 ]
Ding, Lin [2 ,3 ]
Jiang, Mingming [1 ,2 ]
Ai, Yinshuang [1 ,2 ]
Mon, Chit Thet [1 ,4 ]
Hou, Guangbing [1 ]
Sein, Kyaing [5 ]
Thant, Myo [6 ,7 ]
机构
[1] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
[2] Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
[3] Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
[4] Dagon Univ, Dept Geol, Yangon, Myanmar
[5] Myanmar Geosci Soc, Yangon, Myanmar
[6] Univ Yangon, Dept Geol, Yangon, Myanmar
[7] Myanmar Earthquake Comm, Hlaing Univ Campus, Hlaing Township 11052, Yangon, Myanmar
基金
中国国家自然科学基金;
关键词
INTERMEDIATE-DEPTH EARTHQUAKES; SEISMIC TOMOGRAPHY; BREAK-OFF; PAMIR; ASIA; TECTONICS; CRUSTAL; BURMA; FAULT; LITHOSPHERE;
D O I
10.1038/s41467-020-15746-3
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Indian continental subduction can explain Cenozoic crustal deformation, magmatic activity and uplift of the Tibetan Plateau following the India-Asia collision. In the western Himalayan syntaxis and central Himalaya, subduction or underthrusting of the Indian Plate beneath the Eurasian Plate is well known from seismological studies. However, because information on the deep structure of the eastern Himalayan syntaxis is lacking, the nature of the Indian subduction slab beneath Myanmar and the related tectonic regime remain unclear. Here, we use receiver function common conversion point imaging from a densely spaced seismic array to detect direct structural evidence of present-day Indian continental subduction beneath Asia. The entire subducting Indian crust has an average crustal thickness of similar to 30km, dips at an angle of similar to 19 degrees, and extends to a depth of 100km under central Myanmar. These results reveal a unique continental subduction regime as a result of Indian-Eurasian continental collision and lateral extrusion. Indian continental subduction can explain crustal deformation, magmatic activity and uplift of the Tibetan Plateau following collision, however, the nature of the Indian subducting slab beneath Myanmar and the related tectonic regime remain unclear. Here, the authors present direct structural evidence of present-day Indian continental subduction beneath Asia.
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页数:9
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