气候变化领域集成服务门户(CCPortal): Upper mantle and mantle transition zone thermal and water content anomalies beneath NE Asia: Constraints from receiver function imaging of the 410 and 660 km discontinuities

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DOI	10.1016/j.epsl.2019.116040
	Upper mantle and mantle transition zone thermal and water content anomalies beneath NE Asia: Constraints from receiver function imaging of the 410 and 660 km discontinuities
	Sun M.; Gao S.S.; Liu K.H.; Fu X.
发表日期	2020
ISSN	0012821X
卷号	532
英文摘要	The 410 and 660 km discontinuities (d410 and d660) bordering the mantle transition zone (MTZ) beneath NE Asia, including NE China, Eastern Mongolia, and southern Siberia, are imaged in successive circular bins with a radius of 1 degree by stacking a total of 274,413 P-to-s radial receiver functions recorded by 799 broadband seismic stations. After moveout correction based on the 1-D IASP91 Earth model, the resulting apparent depths of the discontinuities exhibit significant and spatially systematic variations. Three approximately N-S elongated narrow zones with significantly thickened MTZ are observed, which may be associated with the thermal effect and dehydration of subducted slabs. The major volcanoes in NE China are underlain by a d660 that is apparently depressed by ∼19 km, which can be interpreted by the presence of an anomalously high water concentration in the lower MTZ released from the stagnated slabs. Low wavespeed anomalies above the d410 west of the Datong volcanic fields are underlain by an MTZ with normal thickness, and are attributable by dehydration of the leading portion of the stagnant Pacific slab in the MTZ that is revealed in an N-S oriented narrow zone east of this area. The lateral shift of the upper mantle low wavespeed zone and the area with thickened MTZ may suggest a westward drift of the upper mantle relative to the subducted slab. An abnormally thin MTZ is observed beneath the Hangay Dome in central Mongolia, suggesting the possible existence of thermal upwelling from the lower mantle through the MTZ. © 2019 Elsevier B.V.
关键词	Cenozoic volcanism mantle plume mantle transition zone Northeast Asia receiver function subduction
英文关键词	Volcanoes; Cenozoic volcanism; Mantle plume; Mantle transition zone; Northeast Asia; Receiver functions; subduction; Dehydration; Cenozoic; discontinuity; mantle plume; seismic data; seismic wave; subduction; transition zone; upper mantle; volcanism; water content; China; Mongolia; Siberia
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/202915
作者单位	College of Earth Science and Research Institute of Unconventional Oil and Gas, Northeast Petroleum University, Daqing, Heilongjiang 163318, China; State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China; Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO 65409, United States
推荐引用方式 GB/T 7714	Sun M.,Gao S.S.,Liu K.H.,et al. Upper mantle and mantle transition zone thermal and water content anomalies beneath NE Asia: Constraints from receiver function imaging of the 410 and 660 km discontinuities[J],2020,532.
APA	Sun M.,Gao S.S.,Liu K.H.,&Fu X..(2020).Upper mantle and mantle transition zone thermal and water content anomalies beneath NE Asia: Constraints from receiver function imaging of the 410 and 660 km discontinuities.Earth and Planetary Science Letters,532.
MLA	Sun M.,et al."Upper mantle and mantle transition zone thermal and water content anomalies beneath NE Asia: Constraints from receiver function imaging of the 410 and 660 km discontinuities".Earth and Planetary Science Letters 532(2020).