Zengmu Xi fault on the western-border of South China Sea and its control over the sedimentation of the Basin
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摘要:
通过解释重新处理的曾母盆地多道地震数据，结合重、磁异常资料，对前人提出南海西缘最南部发育近S-N向“曾母西断裂”的分布区域进行了重新厘定，详细解释了曾母西断裂的构造特征，具体分析了其结构、组成和空间展布特征。确定曾母西断裂由①号断层和②号断层所构成，曾母西①号断层位于4°30′～7°N、109°30′～110°E，主断层面倾向ESE，走向NEN，其为康西坳陷的大型控边断层；曾母西②号断层分布于3°～5°N、109°30′～110°30′E，主断层面倾向NE，走向NNW，其为塔陶垒堑的大型控边断层，曾母西①号断裂往南的延伸终止于曾母西②号断裂。同时分析讨论了曾母西断裂的构造活动特征以及对曾母盆地沉积发育的控制作用。
Abstract:Reprocessed multi-channel seismic data collected from the Zengmu Basin is interpreted in this paper combined with gravity and magnetic anomaly data. It is confirmed that the “Zengmu Xi Fault” is located in the southernmost part of the western-margin of the South China Sea in a nearly S-N direction. The structural characteristics of the fault, especially its composition and spatial framework, are carefully described and explained. It is found that the Zengmu Xi fault is composed of two faults, the Fault 1 and Fault 2. The Fault 1 is located at 4°30′N～7°00′N, 109°30′～110°E, with a main tendency to ESE, and a strike towards NEN. It is a large boundary controlling fault of the Kangxi Depression, while the fault 2 is distributed between 3° and 5°N, 109°30′E and 110°30′E, with a main fault tendency to NE and a strike towards NNW. It is a large boundary controlling fault of the Tatao horst graben. The southward extension of Zengmu Xi fault 1 ends when it meets the fault 2. Upon the basis, the characteristics of the tectonic activity of the Zengmu Xi fault and its control over the depositional evolution of the Zengmu basin are analyzed and discussed.
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