珠江口盆地白云凹陷裂陷期断裂结构与演化特点

doi:10.11978/2015124

Abstract

Abstract: Located at the northern continental slope of the South China Sea, Baiyun Sag of the Pearl River Mouth Basin has gone through the evolution of two episodes of Paleogene rifting, Neogene post-rift subsiding, and tectonic reactivation after middle Miocene. Multi-phase fault systems were developed, and showed both inherited and newborn features. In this study, we divided faults during rifting stage into three kinds according to their scarp shapes. The first kind is planar fault, which usually cuts through only T60, T70 and/or T80, and has a straight fault plane. The second kind is listric fault, cutting through more horizons including Tg. The third kind is detachment fault, which cuts through Tg. Usually, it has a larger vertical displacement than the second kind. Then, we analyzed tectonic style, activity and evolving history of the sag-controlling faults combinations in the southern boundary of the Baiyun Sag with high-resolution 2D and 3D seismic profiles. The results are as follows: there developed large en echelon sag-controlling faults in the southwest of the sag, between them a connecting fault (planar fault) developed to keep regional stretch strain conservation by adjusting deformation and displacement. In the middle of Baiyun Sag’s southern part, four big listic faults are parallel to each other; they started activity at similar times, but the one near the sag center has the largest vertical offset; later the planar faults developed between them. In the northeast of Baiyun Sag, there developed low angle detachment faults in the sag boundary. High angle rotated fault blocks appeared as domino style and stopped their faulting by joining in the detachment fault. Based on the above profile analysis, this paper discussed the formation mechanism of the above-mentioned three kinds of sag-controlling fault systems, providing a reference to deep-sea oil-gas exploration. (in Chinese with English abstract)

Key words: Baiyun Sag, fault structure, sag-controlling fault, rifting stage, evolving history, detachment fault

CLC Number:

P736

ZHANG Jiuyuan, SUN Zhen, ZHENG Jinyun. The structure and evolving history of faults during rifting stage in Baiyun Sag, Pearl River Mouth Basin[J].Journal of Tropical Oceanography, 2016, 35(4): 82-94.

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The structure and evolving history of faults during rifting stage in Baiyun Sag, Pearl River Mouth Basin

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