气候变化领域集成服务门户(CCPortal): Indian continental lithosphere and related volcanism beneath Myanmar: Constraints from local earthquake tomography

CCPortal

DOI	10.1016/j.epsl.2021.116987
	Indian continental lithosphere and related volcanism beneath Myanmar: Constraints from local earthquake tomography
	Zhang G.; He Y.; Ai Y.; Jiang M.; Mon C.T.; Hou G.; Thant M.; Sein K.
发表日期	2021
ISSN	0012821X
卷号	567
英文摘要	The Indian plate descends obliquely eastward beneath the Eurasian plate along the Burmese arc. Previous tomographic results revealed a high-velocity structure that plunges eastward into the deep mantle beneath Myanmar. However, the shallow structure beneath Myanmar remains unclear due to the lack of local seismic observations. Based on the local seismic data recorded by a newly deployed dense array in Myanmar, we obtain a three-dimensional velocity structure of the crust and lithospheric mantle above 100 km by employing the double-difference tomography method. Our imaging results support the existence of the Indian continental lithosphere to a depth of at least 100 km with a dip angle of ∼25° beneath the Indo-Burma Ranges and the Central Myanmar Basin. At the deep end of the continental slab, the high VP, high Vs and rather low average VP/VS ratio indicate that the lowermost portion of the crust from 80 to 120 km may have experienced partially metamorphic eclogitization. The imaging results also provide direct seismic evidence for the origin of the last Monywa volcanic activity in the Holocene. This subduction-related volcanism is characterized by a prominent low Vs anomaly in the lithospheric mantle, which indicates continental lithosphere dehydration and partial melting in mantle wedge. These findings provide new seismic constraints to understand the continental collision system between India and Eurasia under Myanmar and the related magmatic activities of the Monywa volcano. © 2021 Elsevier B.V.
关键词	continental collision Indian continental lithosphere local earthquake tomography Myanmar
英文关键词	Earthquakes; Plates (structural components); Structural geology; Tomography; Volcanoes; Burmese; Continental collisions; Continental lithosphere; Eurasian plates; Indian continental lithosphere; Indian plate; Lithospheric mantle; Local earthquake tomography; Myanmars; Velocity structure; Lithology; continental collision; continental lithosphere; plate convergence; seismic tomography; three-dimensional modeling; volcanism; Myanmar
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203368
作者单位	Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Geology, Dagon University, Yangon, 11422, Myanmar; Department of Geology, Yangon University, Yangon, 11041, Myanmar; Myanmar Earthquake Committee, Hlaing Universities' Campus, Hlaing Township, Yangon, 11052, Myanmar; Myanmar Geosciences Society, Yangon, Myanmar
推荐引用方式 GB/T 7714	Zhang G.,He Y.,Ai Y.,et al. Indian continental lithosphere and related volcanism beneath Myanmar: Constraints from local earthquake tomography[J],2021,567.
APA	Zhang G..,He Y..,Ai Y..,Jiang M..,Mon C.T..,...&Sein K..(2021).Indian continental lithosphere and related volcanism beneath Myanmar: Constraints from local earthquake tomography.Earth and Planetary Science Letters,567.
MLA	Zhang G.,et al."Indian continental lithosphere and related volcanism beneath Myanmar: Constraints from local earthquake tomography".Earth and Planetary Science Letters 567(2021).