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Crustal structure of Xisha block and its tectonic attributes
Guo Xiao-Ran; Zhao Ming-Hui; Huang Hai-Bo; Qiu Xue-Lin; Wang Jian; He En-Yuan; Zhang Jia-Zheng; Guo, XR; Zhao, MH (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.; Guo, XR (reprint author), Earthquake Adm Fujian Prov, Xiamen Ctr Seismic Survey, Xiamen 361021, Peoples R China.; Guo, XR (reprint author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
2016
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
Volume59Issue:4Pages:1414-1425
AbstractXisha block, as a micro-continental massif formed during the process of the formation of the South China Sea (SCS), has recorded important information about the evolutionary history of the SCS. The crustal structure, petrological properties and tectonic attributes of Xisha block are critical to the theory of formation and evolution of the SCS. Based on Ocean Bottom Seismometers (OBS) data acquired from Line OBS2013-3, the P-wave velocity model of Xisha block along the line is established employing the ray-tracing and forward travel-time modeling method. This velocity structure shows that the sedimentary layer is various with a velocity of 2. 2 similar to 3. 2 km . s(-1) and a thickness of 0. 8 similar to 3. 0 km. The basement interface is locally rugged and rough. The velocity values of the upper and lower crusts are 5. 0 similar to 6. 4 km . s(-1) and 6. 5 similar to 6. 9 km . s(-1), and the velocity at the top of upper mantle is 8. 0 km . s(-1). The average crustal thickness of Xisha block is about 23 km. The thickness of the upper and lower crust is 9 km and 14 km, respectively. Moho interface lies at the depth of 23 similar to 27 km. Xisha block is a type of thinned continental crust comparing with the South China continental margin and has a size of about 9. 2 x10(5) km(3) calculated from the two perpendicular seismic profiles. Xisha block and Nansha block are distributed on the two sides of the spreading ridge of NW sub-basin. They are conjugate with each other since. their velocity structures are very similar.
Department[Guo Xiao-Ran; Zhao Ming-Hui; Huang Hai-Bo; Qiu Xue-Lin; Wang Jian; He En-Yuan; Zhang Jia-Zheng] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Guo Xiao-Ran] Earthquake Adm Fujian Prov, Xiamen Ctr Seismic Survey, Xiamen 361021, Peoples R China; [Guo Xiao-Ran; Wang Jian; He En-Yuan] Univ Chinese Acad Sci, Beijing 100049, Peoples R China ; 边缘海地质
KeywordXisha Block Deep Crustal Structure Thinned Continental Crust Ocean Bottom Seismometer (Obs)
Subject AreaGeochemistry & Geophysics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15589
Collection中科院边缘海地质重点实验室
Corresponding AuthorGuo, XR; Zhao, MH (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.; Guo, XR (reprint author), Earthquake Adm Fujian Prov, Xiamen Ctr Seismic Survey, Xiamen 361021, Peoples R China.; Guo, XR (reprint author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Guo Xiao-Ran,Zhao Ming-Hui,Huang Hai-Bo,et al. Crustal structure of Xisha block and its tectonic attributes[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2016,59(4):1414-1425.
APA Guo Xiao-Ran.,Zhao Ming-Hui.,Huang Hai-Bo.,Qiu Xue-Lin.,Wang Jian.,...&Guo, XR .(2016).Crustal structure of Xisha block and its tectonic attributes.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(4),1414-1425.
MLA Guo Xiao-Ran,et al."Crustal structure of Xisha block and its tectonic attributes".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.4(2016):1414-1425.
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