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Low-velocity layers in the northwestern margin of the South China Sea: Evidence from receiver functions of ocean-bottom seismometer data

文献类型：期刊论文

作者Huang, Haibo2,3; Qiu, Xuelin2,3,4; Zhang, Jiazheng2,3; Hao, Tianyao1
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2019-12-01
卷号186页码:10
关键词Low-velocity layer Shearing structure Magmatic underplating Receiver function Ocean bottom seismometer South China Sea
ISSN号1367-9120
DOI10.1016/j.jseaes.2019.104090
英文摘要The receiver function method was applied to teleseismic recordings of an active-source ocean-bottom seismometer array in the northwestern margin of the South China Sea. Forward modeling of the receiver functions was used to derive velocity interfaces beneath the stations. Two main groups of low-velocity layers were imaged. The first group in the reef area, with a thickness of 7-10 km, exhibits a seaward uptrend of the buried depth but poor continuity. The second group, with a thickness of 3-4 km, is more continuous along the Zhongsha Trough; the buried depth decreases asymmetrically from the flanks to the rift center. A high shear wave velocity layer of similar to 4.0 km/s is imaged at the crust bottom beneath the Zhongsha Trough, with thickness of similar to 3 km. The average Vp/Vs in the Cenozoic sediment is 2.0-3.0 and was affected by high fluid activity induced by intensive faults. The Vp/Vs of the crust varies between 1.77 and 1.88, suggesting an intermediate to basic composition under the continental extension. Together, these results suggest a two-stage evolution model of the continental crust. In the first stage, the crust deformed in a ductile manner and thus created considerable shearing structures with high anisotropy that caused the obvious decrease of the shear wave velocity. In the second stage, the shearing structures connected asymmetrically, driven by detachment faults in the upper crust and upwelling of the lower crust. The Zhongsha Trough then formed, probably with magmatic underplating due to lithospheric extension or rising of hot mantle materials.
WOS关键词CRUSTAL STRUCTURE BENEATH ; DEEP-WATER AREA ; QIONGDONGNAN BASIN ; XISHA ISLANDS ; P-WAVE ; FLOW ; ORIGIN ; FAULT ; ZONE ; IDENTIFICATION
资助项目National Natural Science Foundation of China[41306046] ; National Natural Science Foundation of China[41676045] ; National Natural Science Foundation of China[41674092] ; Guangdong NSF research team project[2017A030312002]
WOS研究方向Geology
语种英语
WOS记录号WOS:000504524700011
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project
源URL[http://ir.iggcas.ac.cn/handle/132A11/95847]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Huang, Haibo
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou 510301, Guangdong, Peoples R China
3.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Huang, Haibo,Qiu, Xuelin,Zhang, Jiazheng,et al. Low-velocity layers in the northwestern margin of the South China Sea: Evidence from receiver functions of ocean-bottom seismometer data[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,186:10.
APA Huang, Haibo,Qiu, Xuelin,Zhang, Jiazheng,&Hao, Tianyao.(2019).Low-velocity layers in the northwestern margin of the South China Sea: Evidence from receiver functions of ocean-bottom seismometer data.JOURNAL OF ASIAN EARTH SCIENCES,186,10.
MLA Huang, Haibo,et al."Low-velocity layers in the northwestern margin of the South China Sea: Evidence from receiver functions of ocean-bottom seismometer data".JOURNAL OF ASIAN EARTH SCIENCES 186(2019):10.

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来源：地质与地球物理研究所

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