南沙海域礼乐地块构造地层及地壳结构特征

孙龙涛; 田振兴; 詹文欢; 孙宗勋

doi:10.3799/dqkx.2011.090

Volume 36 Issue 5

Sep. 2011

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Article Navigation > Earth Science > 2011 > 36(5): 861-868

SUN Long-tao, TIAN Zhen-xing, ZHAN Wen-huan, SUN Zong-xun, 2011. Crust Structure and Tectonostratigraphy of Liyue Block, Northeast of Nansha Area. Earth Science, 36(5): 861-868. doi: 10.3799/dqkx.2011.090

Citation:

SUN Long-tao, TIAN Zhen-xing, ZHAN Wen-huan, SUN Zong-xun, 2011. Crust Structure and Tectonostratigraphy of Liyue Block, Northeast of Nansha Area. Earth Science, 36(5): 861-868. doi: 10.3799/dqkx.2011.090

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Crust Structure and Tectonostratigraphy of Liyue Block, Northeast of Nansha Area

doi: 10.3799/dqkx.2011.090

1.
CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
2.
Qingdao Institute of Marine Geology, Qingdao 266071, China

Received Date: 2011-05-24
Publish Date: 2011-09-15

Abstract

Abstract

The Liyue block is composed of two parts, namely, Reed Bank and Liyue basin, which is separated by Zhongnan fault in west, Palawan trough in southeast and fault scarp in the north of Nansha area.Based on gravity and seismic data set, a systematic investigation on major tectonic and crust structure units in the Liyue block is made.Multichannel seismic data can better our understanding of the stratum and fault structure located in the sediment basement.In the Reed Bank, composed of reefs, the faults are undeveloped and the stratum is flat.In the basin area, the early faults are developed with two kinds of structures: tilted fault block and low relief anticline.The thickness of the Mesozoic strata in basin area decreases from SW to NE.But the thickness of rifting strata increases from SW to NE, which indicates the fault activity strength in the rift period increases from southwest to northeast.Gravity inversion is performed to understand the geometry of the MOHO surface and the crustal thicknesses beneath.The region is characterized by a large positive Bouguer gravity anomaly (60 to 140 mGal), and the MOHO depth generally varies from 16 to 27 km.In general, crustal structures can be distinguished from the thinned continental crust.The Liyue block is characterized by stretching factors ranging from 1.3 to 2.0, which indicates that the local region is lowly stretched.
- Liyue block,
- gravity inversion,
- tectonics,
- crust structure,
- marine geology

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致谢: 感谢李家彪研究员、丘学林研究员和阎贫研究员提供的地震反射剖面!

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