Crustal structure of Xisha block and its tectonic attributes

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	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
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2016
卷号	59 期号:4 页码:1414-1425
关键词	Xisha block Deep crustal structure Thinned continental crust Ocean Bottom Seismometer (OBS)
通讯作者	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.
中文摘要	Xisha 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.
学科主题	Geochemistry & Geophysics
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/15589]
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	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.,...&Zhang Jia-Zheng.(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.