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学科主题: Geochemistry & Geophysics ; Oceanography
题名: Segmentation of the Manila subduction system from migrated multichannel seismics and wedge taper analysis
作者: [Zhu, Junjiang ; Sun, Zongxun ; Qiu, Xuelin ; Xu, Huilong ; Zhan, Wenhuan] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Kopp, Heidrun] Helmeholtz Ctr Ocean Res Kiel GEOMAR, D-24148 Kiel, Germany ; [Li, Sanzhong] Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China
通讯作者: jzhu@scsio.ac.cn
关键词: Manila subduction system ; Accretion and erosion ; Accretionary/frontal prism ; Forearc slope angle and taper angle ; Tsunami earthquake ; Splay faults
刊名: MARINE GEOPHYSICAL RESEARCH
发表日期: 2013
卷: 34, 期:41702, 页:379-391
部门归属: 海洋地质
资助者: We thank the crew members of the R/V Tanbao for their efforts for collecting the Line 973 seismic data. We used the GMT software (Wessel and Smith 1991) and Seismic Unix software package (Stockwell 1999) to plot several figures. Reviews by guest Editor Peter Clift and two anonymous reviewers greatly improved the manuscript. This study has been supported by the National Nature Science Foundation of China (Grant No.: 41176054 and Grant No.: 41006030) and the Knowledge Innovation Program of the Chinese Academy of Sciences (SQ200910), and the Joint Funds of the National Natural Science Foundation of China and Guangdong province (Grand No.: U0933006).
摘要: Based on bathymetric data and multichannel seismic data, the Manila subduction system is divided into three segments, the North Luzon segment, the seamount chain segment and the West Luzon segment starts in Southwest Taiwan and runs as far as Mindoro. The volume variations of the accretionary prism, the forearc slope angle, taper angle variations support the segmentation of the Manila subduction system. The accretionary prism is composed of the outer wedge and the inner wedge separated by the slope break. The backstop structure and a 0.5-1 km thick subduction channel are interpreted in the seismic Line 973 located in the northeastern South China Sea. The clear d,collement horizon reveals the oceanic sediment has been subducted beneath the accretionary prism. A number of splay faults occur in the active outer wedge. Taper angles vary from 8.0A degrees A A +/- A 1A degrees in the North Luzon segment, 9.9A degrees A A +/- A 1A degrees in the seamount segment to 11A degrees A A +/- A 1A degrees in the West Luzon segment. Based on variations between the taper angle and orthogonal convergence rates in the world continental margins and comparison between our results and the global compilation, different segments of the Manila subduction system fit well the global pattern. It suggests that subduction accretion dominates the north Luzon and seamount chain segment, but the steep slope indicates in the West Luzon segment and implies that tectonic erosion could dominate the West Luzon segment.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000328450000015
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/11100
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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[Zhu, Junjiang; Sun, Zongxun; Qiu, Xuelin; Xu, Huilong; Zhan, Wenhuan] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Kopp, Heidrun] Helmeholtz Ctr Ocean Res Kiel GEOMAR, D-24148 Kiel, Germany; [Li, Sanzhong] Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China.Segmentation of the Manila subduction system from migrated multichannel seismics and wedge taper analysis,MARINE GEOPHYSICAL RESEARCH,2013,34(41702):379-391
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