Southeastern extension of the Red River fault zone (RRFZ) and its tectonic evolution significance in western South China Sea
Southeastern extension of the Red River fault zone (RRFZ) and its tectonic evolution significance in western South China Sea
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DOI：
10.1007/s11430-006-0839-x
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发表时间：
2006-08-01
期刊：
影响因子：
--
通讯作者：
Ji Shaocheng
中科院分区：
文献类型：
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作者：
Liu Baoming;Xia Bin;Ji Shaocheng
新近的地球物理调查和盆地模拟研究表明，莺歌海盆地1号断裂是南海红河断裂带向海的延伸。RRFZ是华南和中南地块的分界带，它首先沿着越南近海的粤东断裂延伸，然后继续向南断裂成两个分支：卢帕尔断裂和丁家断裂。卢帕尔断层的南部延伸在婆罗洲西北部消失，而丁加断层向东南延伸，到达文莱-沙巴地区。根据重力、地磁资料和盆地的构造演化，万安盆地与南沙地块的盆地具有不同的演化历史。田家断裂可能是巴林阶地块与南沙地块的分界线。因此，在地质演化史上均为大陆边缘断裂和走滑断裂的粤东断裂和田家断裂的连线构成了中南地块与南沙地块的分界线。相反，卢帕尔断层是印度支那地块内的板内断层。研究结果为恢复该区的构造演化史和南海的开启提供了新的线索，也为该区的油气勘探提供了框架。
Recent geophysical surveys and basin modeling suggest that the No.1 fault in the Yinggehai basin (YGHB) is the seaward elongation of the Red River fault zone (RRFZ) in the South China Sea (SCS). The RRFZ, which separates the South China and Indochina block, extends first along the Yuedong fault, offshore of Vietnam, and then continues southward and breaks off into two branches: the Lupar fault and the Tinjia fault. The southern extension of the Lupar fault dies out beneath the NW Borneo while the Tinjia fault extends southeast and reaches the Brunei-Sabah area. According to the gravity and geomagnetic data, and the tectonic evolution of the basins, there are different evolution histories between the Wan'an basin (WAB) and the basins in the Nansha block. The Tinjia fault may be the boundary between the Balingian block and the Nansha block. Hence, the line linking the Yuedong fault and the Tinjia fault, which both are continental margin faults and strike-slip ones in the geological evolution histories, constitute the boundary between the Indochina and Nansha block. The Lupar fault, in contrast, is an intraplate fault within the Indochina block. The results provide new hints for reconstructing the tectonic evolution history of the RRFZ and the opening of the SCS, and also a framework for hydrocarbon prospecting in the region.