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Tomographic evidence for the subducting oceanic crust and forearc mantle serpentinization under Kyushu, Japan
Xia, SH; Zhao, DP; Qiu, XL; shxia1982@yahoo.com; zhao@aob.geophys.tohoku.ac.jp
2008
发表期刊TECTONOPHYSICS
ISSN0040-1951
卷号449期号:40547页码:85-96
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.
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
关键词Serpentinization Subducting Oceanic Crust Philippine Sea Slab Seismic Tomography
学科领域Geochemistry & Geophysics
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000254722100005
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被引频次:41[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4566
专题中科院边缘海地质重点实验室
通讯作者shxia1982@yahoo.com; zhao@aob.geophys.tohoku.ac.jp
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Xia, SH,Zhao, DP,Qiu, XL,et al. Tomographic evidence for the subducting oceanic crust and forearc mantle serpentinization under Kyushu, Japan[J]. TECTONOPHYSICS,2008,449(40547):85-96.
APA Xia, SH,Zhao, DP,Qiu, XL,shxia1982@yahoo.com,&zhao@aob.geophys.tohoku.ac.jp.(2008).Tomographic evidence for the subducting oceanic crust and forearc mantle serpentinization under Kyushu, Japan.TECTONOPHYSICS,449(40547),85-96.
MLA Xia, SH,et al."Tomographic evidence for the subducting oceanic crust and forearc mantle serpentinization under Kyushu, Japan".TECTONOPHYSICS 449.40547(2008):85-96.
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