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学科主题: Geochemistry & Geophysics
题名: Tomographic evidence for the subducting oceanic crust and forearc mantle serpentinization under Kyushu, Japan
作者: Xia, SH ; Zhao, DP ; Qiu, XL
通讯作者: shxia1982@yahoo.com ; zhao@aob.geophys.tohoku.ac.jp
关键词: serpentinization ; subducting oceanic crust ; Philippine Sea slab ; seismic tomography
刊名: TECTONOPHYSICS
发表日期: 2008
卷: 449, 期:40547, 页:85-96
收录类别: sci
部门归属: [Xia, Shaohong; Qiu, Xuelin] Chinese Acad Sci, S China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Peoples R China; [Xia, Shaohong; Zhao, Dapeng] Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan
项目归属: 海洋地质
摘要: We determined high-resolution three-dimensional P- and S-wave velocity (Vp, Vs) structures beneath Kyushu in Southwest Japan using 177,500 P and 174,025 S wave arrival times from 8515 local earthquakes. A Poisson's ratio structure was derived from the obtained Vp and Vs values. Our results show that significant low-Vp, low-Vs and high Poisson's ratio zones are extensively distributed along the volcanic front in the uppermost mantle, which extend and dip toward the back-arc side in the mantle wedge. In the crust, low-Vp, low-Vs and high Poisson's ratio anomalies exist beneath the active volcanoes. The subducting Philippine Sea slab is clearly imaged as a high-Vp, high-Vs and low Poisson's ratio zone from the Nankai Trough to the back-arc. A thin low-velocity zone is detected above the subducting Philippine Sea slab in the mantle wedge, and earthquakes in the upper mantle are distributed along the transition zone between this thin low-velocity zone and the high-velocity Philippine Sea slab, which may imply that oceanic crust exists on the top of the slab and the forearc mantle wedge is serpentinized due to the slab dehydration. The seismic velocity of the subducting oceanic crust with basaltic or gabbroic composition is lower than that of the mantle according to the previous studies. The serpentinization process could also dramatically reduce the seismic velocity in the forearc mantle wedge. (C) 2008 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000254722100005
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4566
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Xia, SH; Zhao, DP; Qiu, XL.Tomographic evidence for the subducting oceanic crust and forearc mantle serpentinization under Kyushu, Japan,TECTONOPHYSICS,2008,449(40547):85-96
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