Direct structural evidence of Indian continental subduction beneath Myanmar

Tianyu Zheng, Yumei He (), Lin Ding, Mingming Jiang, Yinshuang Ai, Chit Thet Mon, Guangbing Hou, Kyaing Sein and Myo Thant
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Tianyu Zheng: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences
Yumei He: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences
Lin Ding: CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences
Mingming Jiang: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences
Yinshuang Ai: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences
Chit Thet Mon: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences
Guangbing Hou: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences
Kyaing Sein: Myanmar Geosciences Society
Myo Thant: University of Yangon

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract 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 ~30 km, dips at an angle of ~19°, and extends to a depth of 100 km under central Myanmar. These results reveal a unique continental subduction regime as a result of Indian-Eurasian continental collision and lateral extrusion.

Date: 2020
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DOI: 10.1038/s41467-020-15746-3

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