globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2019.116040
论文题名:
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
作者: Sun M.; Gao S.S.; Liu K.H.; Fu X.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 532
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165293
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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

Recommended Citation:
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]. Earth and Planetary Science Letters,2020-01-01,532
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