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学科主题: Geosciences, Multidisciplinary
题名: Crustal Structure beneath Yinggehai Basin and Adjacent Hainan Island, and Its Tectonic Implications
作者: Wu, SM ; Qiu, XL ; Zhou, D ; Zeng, GP ; Xia, KY ; Ye, SY
通讯作者: smwu@scsio.ac.cn
关键词: crustal structure ; strike-slip fault ; pull-apart basin ; Yinggehai ; South China Sea
刊名: JOURNAL OF EARTH SCIENCE
发表日期: 2009
卷: 20, 期:1, 页:13-26
收录类别: sci
部门归属: [Wu Shimin; Qiu Xuelin; Zhou Di; Xia Kanyuan] Chinese Acad Sci, S China Sea Inst Oceanol, Key Laborotary Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Zeng Gangping] Hainan Branch State Seismol Bur, Haikou 570203, Peoples R China
项目归属: 海洋地质
摘要: Two NE-SW trending wide-angle seismic profiles were surveyed across the Chinese side of the Yinggehai (sic) basin (YGHB) with ocean bottom hydrophones (OBHs) and piggyback recorded by onshore stations located on the Hainan (sic) Island. Detailed velocity-depth models were obtained through traveltime modeling and partially constrained by amplitude calculations. More than 15 km Tertiary sedimentary infill within the YGHB can be divided in to three layers with distinct velocity-depth distribution. Overall, the upper layer has a high velocity gradient with 3.8-4.1 km/s at its bottom, consistent with progressive compaction and diagenesis. Its thickness increases gradually towards the basin center, reaching 4.5 km along the southern profile. The middle layer is characterized in its most part as a pronounced low velocity zone (LVZ) with average velocity as low as 3.0 km/s. Its thickness increases from 3.0 to over 4.5 kin from NW towards SE. The primary causes of the velocity inversion are high accumulation rate and subsequent under-compaction of sediments. The velocity at the top of the lower layer is estimated at about 4.5 km/s. Despite strong energy source used (4 x 12L airgun array), no reflections can be observed from deeper levels within the basin. Towards NE the basin is bounded sharply by a clear and deep basement fault (Fault No. 1), which seems to cut through the entire crust. A typical continental crust with low-velocity middle crust is found beneath the coast of the western Hainan Island. Its thickness is determined to be 28 kin and shows no sign of crustal thinning towards the basin. The sharp change in crustal structure across Fault No. 1 indicates that the fault is a strike-slip fault. The crustal structure obtained in this study clearly favors the hypothesis that the YGHB is a narrow pull-apart basin formed by strike-slip faulting of the Red River fault zone.
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WOS记录号: WOS:000264753800002
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4634
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Wu, SM; Qiu, XL; Zhou, D; Zeng, GP; Xia, KY; Ye, SY.Crustal Structure beneath Yinggehai Basin and Adjacent Hainan Island, and Its Tectonic Implications,JOURNAL OF EARTH SCIENCE,2009,20(1):13-26
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