Tomographic evidence for the subducting oceanic crust and forearc mantle serpentinization under Kyushu, Japan
文献类型：期刊论文
| 作者 | Xia, SH ; Zhao, DP ; Qiu, XL |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2008 |
| 卷号 | 449期号:40547页码:85-96 |
| 关键词 | serpentinization subducting oceanic crust Philippine Sea slab seismic tomography |
| ISSN号 | 0040-1951 |
| 通讯作者 | shxia1982@yahoo.com ; zhao@aob.geophys.tohoku.ac.jp |
| 中文摘要 | 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. |
| 学科主题 | Geochemistry & Geophysics |
| 收录类别 | SCI |
| 原文出处 | 40615 |
| WOS记录号 | WOS:000254722100005 |
| 公开日期 | 2011-07-03 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/4566]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 GB/T 7714 | Xia, SH,Zhao, DP,Qiu, XL. 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.(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. |
入库方式： OAI收割
来源：南海海洋研究所
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