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Subduction of a buoyant plateau at the Manila Trench: Tomographic evidence and geodynamic implications
Fan, Jianke1,2; Zhao, Dapeng3; Dong, Dongdong1,2
2016-02-01
发表期刊GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷号17期号:2页码:571-586
文章类型Article
摘要We determined P-wave tomographic images by inverting a large number of arrival-time data from 2749 local earthquakes and 1462 teleseismic events, which are used to depict the three-dimensional morphology of the subducted Eurasian Plate along the northern segment of the Manila Trench. Dramatic changes in the dip angle of the subducted Eurasian Plate are revealed from the north to the south, being consistent with the partial subduction of a buoyant plateau beneath the Luzon Arc. Slab tears may exist along the edges of the buoyant plateau within the subducted plate induced by the plateau subduction, and the subducted lithosphere may be absent at depths greater than 250 km at approximate to 19 degrees N and approximate to 21 degrees N. The subducted buoyant plateau is possibly oriented toward NW-SE, and the subducted plate at approximate to 21 degrees N is slightly steeper than that at approximate to 19 degrees N. These results may explain why the western and eastern volcanic chains in the Luzon Arc are separated by approximate to 50 km at approximate to 18 degrees N, whereas they converge into a single volcanic chain northward, which may be related to the oblique subduction along the Manila Trench caused by the northwestern movement of the Philippine Sea Plate. A low-velocity zone is revealed at depths of 20-200 km beneath the Manila Accretionary Prism at approximate to 22 degrees N, suggesting that the subduction along the Manila Trench may stop there and the collision develops northward. The Taiwan Orogeny may originate directly from the subduction of the buoyant plateau, because the initial time of the Taiwan Orogeny is coincident with that of the buoyant plateau subduction.
关键词Seismic Tomography Manila Trench Subduction Buoyant Plateau Earthquakes
DOI10.1002/2015GC006201
收录类别SCI
语种英语
WOS记录号WOS:000373070100019
引用统计
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/126250
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
3.Tohoku Univ, Dept Geophys, Sendai, Miyagi 980, Japan
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Fan, Jianke,Zhao, Dapeng,Dong, Dongdong. Subduction of a buoyant plateau at the Manila Trench: Tomographic evidence and geodynamic implications[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2016,17(2):571-586.
APA Fan, Jianke,Zhao, Dapeng,&Dong, Dongdong.(2016).Subduction of a buoyant plateau at the Manila Trench: Tomographic evidence and geodynamic implications.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,17(2),571-586.
MLA Fan, Jianke,et al."Subduction of a buoyant plateau at the Manila Trench: Tomographic evidence and geodynamic implications".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 17.2(2016):571-586.
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