西沙群岛礁区的地质构造及其活动性分析

doi:10.11978/j.issn.1009-5470.2015.03.006

Abstract

Abstract: Organic reef, widely developed since the Miocene around the Xisha Islands, provides rich information of tectonic movement and activity. Using single-channel seismic profiles acquired and combining with other research in this area, this paper discusses the tectonic movement and activity around the Xisha Islands. The results show that there are NE-NEE and NW trending faults along the Xisha block boundary and NE and EW trending faults in the Xisha block. These faults are inherited from old ones, and the reactivation of the faults accompanied by volcanicity is affected by multiphase tectonic movements. Result from the NW direction stress caused by the opening of the Southwest Sub-basin, the Zhong-Xisha block is in a compression environment. The seismic profile shows that there is a distinct difference between the two sides of the EW fault in terms of formation, which indicates that the two sides of the formation are in different tectonic environments. After the Pleistocene, volcanic and most of faulting activity stopped, and the Xisha Islands behave as a stable tectonic entity.

Key words: tectonics, activity, organic reef, Xisha Islands

FENG Ying-ci, ZHAN Wen-huan, YAO Yan-tao, SUN Jie, LIU Shou-jin, LI Jian. Analysis of tectonic movement and activity in the organic reef region around the Xisha Islands[J].Journal of Tropical Oceanography, 2015, 34(3): 48-53.

References

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Analysis of tectonic movement and activity in the organic reef region around the Xisha Islands

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