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  4. 中国科学院地球与行星物理重点实验室
Mantle Transition Zone Structure Beneath Myanmar and Its Geodynamic Implications

文献类型：期刊论文

作者Bai, Yiming1,3,5; Yuan, Xiaohui5; He, Yumei1,3,4; Hou, Guangbing1; Thant, Myo2; Sein, Kyaing6; Ai, Yinshuang1,3,4
刊名GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
出版日期2020-12-01
卷号21期号:12页码:18
关键词mantle discontinuity receiver function slab break‐ off slab tearing subduction zone
DOI10.1029/2020GC009262
英文摘要Linking the India-Tibet collision to the north and the Andaman oceanic subduction to the south, Myanmar occupies a crucial position in the India-Eurasia convergence system. Various seismological studies have indicated that the Indian plate is obliquely subducted along the Burma arc. However, the depth extent and continuity of the subducted slab remain enigmatic. With seismic recordings collected from 114 recently deployed seismic stations, we map the topographies of the mantle transition zone (MTZ) boundaries, that is, the 410- and 660-km discontinuities, beneath Myanmar using receiver functions. Regional 3-D velocity models were adopted to account for the lateral velocity heterogeneity. The 410-km discontinuity is uplifted by over 15 km within 95 degrees E-97 degrees E and 21 degrees N-24 degrees N beneath Myanmar. This feature correlates well with the east-dipping high-velocity anomaly in the tomographic models, with a velocity increase of 0.9%-1.2% at the 410-km discontinuity depth, suggesting that the subducted slab has reached the MTZ. The uplift of the 410-km discontinuity terminates to the south at similar to 21 degrees N, indicating a distinct change in slab geometry. Our results also reveal a depressed 660-km discontinuity, which is spatially offset to the southwest of the uplifted 410-km discontinuity. We propose that the offset between the 410-km discontinuity uplift and the 660-km discontinuity depression could indicate a slab break-off and tearing beneath Myanmar, which was triggered by the northward motion of the Indian plate during the eastward subduction. We further speculate that the slab tear could mark the transition from oceanic to continental plate subduction.
WOS关键词SLAB BENEATH ; INDIAN SLAB ; SEISMIC DISCONTINUITY ; LITHOSPHERE BENEATH ; ASIA MANTLE ; SUBDUCTION ; TIBET ; PLATE ; TOMOGRAPHY ; EASTERN
资助项目National Natural Science Foundation of China[41490612] ; Chinese Academy of Sciences[XDB18000000] ; International Partnership Program of the Chinese Academy of Sciences[GJHZ1776] ; China Scholarship Council[201804910411]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000603662700021
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council
源URL[http://ir.iggcas.ac.cn/handle/132A11/99973]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Ai, Yinshuang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.Univ Yangon, Dept Geol, Yangon, Myanmar
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
4.Univ Chinese Acad Sci, Beijing, Peoples R China
5.Deutsch GeoForschungsZentrum GFZ, Potsdam, Germany
6.Myanmar Geosci Soc, Yangon, Myanmar
推荐引用方式
GB/T 7714		 Bai, Yiming,Yuan, Xiaohui,He, Yumei,et al. Mantle Transition Zone Structure Beneath Myanmar and Its Geodynamic Implications[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2020,21(12):18.
APA Bai, Yiming.,Yuan, Xiaohui.,He, Yumei.,Hou, Guangbing.,Thant, Myo.,...&Ai, Yinshuang.(2020).Mantle Transition Zone Structure Beneath Myanmar and Its Geodynamic Implications.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,21(12),18.
MLA Bai, Yiming,et al."Mantle Transition Zone Structure Beneath Myanmar and Its Geodynamic Implications".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 21.12(2020):18.

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来源：地质与地球物理研究所

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