DOI: 10.1016/j.epsl.2021.117115
论文题名: Layered mantle heterogeneities associated with post-subducted slab segments
作者: Yu Y. ; Xu Z. ; Gao S.S. ; Liu K.H. ; Gao J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 571 语种: 英语
中文关键词: mantle heterogeneities
; mantle transition zone
; post-subducted slab segments
; receiver function
; South China Sea
英文关键词: Driving mechanism
; Mantle heterogeneity
; Mantle transition zone
; Marginal seas
; Pacific ocean
; Post-subducted slab segment
; Receiver functions
; Slab pull
; South China sea
; Western Pacific
; Oceanography
英文摘要: The South China Sea (SCS) is a hydrocarbon-rich major marginal sea in the western Pacific Ocean. One of the proposed driving mechanisms for its formation is the slab-pull of a Mesozoic ocean basin known as the Proto-South China Sea (PSCS), which subducted beneath northern Borneo between the Eocene and the early Miocene. However, the present-day depth extent of the slabs and even the existence of the PSCS remain highly debated. By stacking P-to-S conversions from the 410 km and 660 km discontinuities bordering the mantle transition zone (MTZ), we demonstrate significant MTZ thickening beneath the southern margin of the SCS, which, when combined with previously-revealed high-velocity anomalies in the MTZ, provides evidence for the existence of the PSCS. Chemically and rheologically heterogeneous materials segregated from the slab segments may have generated layered structures as evidenced by the discontinuities observed at the depths of ∼350 km and ∼730 km. Dehydration melting from the slab segments may be a viable mechanism for the extensive post-spreading magmatism in the southern SCS. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165737
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China; National Marine Environmental Forecasting Center, Beijing, 100081, China; Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO 65409, United States
Recommended Citation:
Yu Y.,Xu Z.,Gao S.S.,et al. Layered mantle heterogeneities associated with post-subducted slab segments[J]. Earth and Planetary Science Letters,2021-01-01,571