南海北缘白云凹陷北坡裂后断裂活动特征及构造沉积响应*

doi:10.11978/2017007

Abstract

Abstract:

For deep understanding of the evolution of a fault in the passive continental margin slope, we analyzed the characteristics of fault activities and sedimentary response on the northern slope of the Baiyun Sag in this paper. Based on geological structural interpretation of 3D seismic profiles, fault activities were studied by using growth index. The results showed that the fault strike mainly is NWW-trending, while the rest are NEE- to EW-trending of small faults in the eastern and northern slope zones of the Baiyun Sag. In the vertical sections, these faults exhibited ladder and conjugated shaped combinations, while a single fault may be of planar shape. There were three episodes of post-rift fault activities, namely, 23.03-21 Ma, 19.1-15.97 Ma and 10-2.59 Ma. There has been a significant increasing activity since 10 Ma. The study of faults’ orientation indicates that Cenozoic stress field rotated clockwise from NS to NNE and the deflection angle is about 8 degrees. The main controlling factor of fault activities on the northern slope zone of the Baiyun Sag was the continuing strong abnormal subsidence and rapid sedimentation, while the rifting of the South China Sea was also an important factor that formed weak compressive stress on the northern margin; and the convergence between South China Sea plate and Philippine Sea plate played a key role in faults’ reactivation. Sedimentary units responded to tectonic movements directly in a series of deformation. The Dongsha Event was most obvious by canyon incisions, strata truncation and fault reactivation. We suggest the driving force came from the east.

Key words: Baiyun Sag, post-rift fault activities, tectonic reactivation, sedimentary response

Zhiyuan XIE, Jianmin YANG, Longtao SUN, Jinyun ZHENG, Zhen SUN, Ning QIU. The characteristics of post-rift fault activities and sedimentary response on the northern slope of the Baiyun Sag in the northern margin of the South China Sea[J].Journal of Tropical Oceanography, 2017, 36(5): 59-71.

Figures/Tables 10

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	1组	2组	3组	4组	西区	东区	全区
裂后一期	1.13	1.32	1.11	1.15	1.23	1.13	1.18
裂后二期	1.1	1.15	1.32	1.2	1.12	1.26	1.19
裂后三期	1.25	无	1.5	1.44	1.25	1.47	1.36

The characteristics of post-rift fault activities and sedimentary response on the northern slope of the Baiyun Sag in the northern margin of the South China Sea

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