Tectonics and discrepant evolution of Cenozoic sedimentary basins adjacent Hainan Island

被引：0
|
作者：
Wu S. [1 ,2 ]
Lu X. [1 ]
Li G. [3 ]
Long G. [4 ]
机构：
[1] Institute of Deep-Sea Science and Engineering, China Academy of Science, Hainan, Sanya
[2] South Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong, Zhuhai
[3] NEPU Sanya Offshore Oil &- Gas Research Institute, Hainan, Sanya
[4] Marine Geological Institute of Hainan Province, Hainan Geological Bureau, Hainan, Haikou
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2024年 / 98卷 / 01期
关键词：
pull-apart basin; rifting basin; South China; stratigraphic sequence; tectonic evolution;
D O I：
10.19762/j.cnki.dizhixuebao.2023168
中图分类号：
学科分类号：
摘要：
The four Cenozoic sedimentary basins adjacent to Hainan Island have undergone significant development. These basins include Yingehai basin, Beibuwan basin, Qiongdongnan basin, and Zhu Ш sag of the Zhujiangkou basin. Based on the latest geophysical data, we have redefined the structure and evolution of the Mesozoic-Cenozoic basins, as well as their relation to Hainan's onshore geological structures. The basins have well-developed NE and NW structures, but significant differences exist between them. The former NW-trending Yinggehai basin, influenced by the Red River fault, is characterized by tension and compressive torsion, resembling a pull-apart basin. On the other hand, the NE basins, located in the southern part of the continental margin of South China, are sandwiched between the Jiangshao-Bobai Faults and the southern Lishui-Nanao faults. The evolution of the Baisha basin is consistent with the Mesozoic basin in the continental margin of South China. The extensionalprocesses began in the Late Cretaceous, resulting in four instances of rifting. Subsequent magma activity led to the reconstruction of the sedimentary basin, exhibiting magma eruptions and high heat flow values. This tectonic distribution is extremely incompatible with the surrounding basins. Theoffshore fracture could extend to the southernmost region, showing obvious seismic activity. We infer that the tectonics of Hainan Island exhibit consistency with the northern South China Sea margin. © 2024 Geological Society of China. All rights reserved.
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页码：16 / 30
页数：14
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