珠江口盆地珠一坳陷始新世中-晚期构造变革特征及成因

doi:10.11743/ogg20160518

Abstract

Abstract: Comprehensive analyses of unconformities,faulting systems and basin tectonic framework were carried out to characterize tectonic transformation mechanisms during the periods of Early-Middle Eocene and Late Eocene-Early Oligocene in the Zhu 1 Depression of Pearl River Mouth Basin.The results show that the Indochina block's rotation and extrusion and southward subduction of the proto-South China Sea resulted in a regional stress field clockwise change from NW-into SN-extension,and a shift in fault-controlled basin from NE- and NEE-trending to near EW and NWW-trending,with numerous new faults of EW-trending developed.The lithosphere extensional deformation transformed from homogeneous wide rift mode to centralized narrow rift mode,and migrated to north margin of the South China Sea.As a result,the Basin expanded as the isolated half-grabens or narrow grabens tended to get connected.Under a SN-trending stretching,the stretch boundary at the north of the depression was defined by basin-controlling faults.As a pre-existing weak zone with concentrated stress,the northern margin experienced strong and northward faulting and significantly spread northwards,causing the sedimentary center migrating northward as well.The tectonic changes during the faulting activities of the Basin may explain the characteristic differences of the two source rocks:the Wenchang and the Enping Formations,as well as the disparity of oil and gas distribution in the area.

Key words: half-graben, rift, tectonic transformation, Middle-Late Eocene, Zhu 1 Depression, Pearl River Mouth Basin

CLC Number:

TE121.2

Hu Yang, Wu Zhiping, Zhong Zhihong, Zhang Jiangtao, Yu Weigao, Wang Guangzeng, Liu Yiming, Wang Shouye. Characterization and genesis of the Middle and Late Eocene tectonic changes in Zhu 1 Depression of Pearl River Mouth Basin[J]. Oil & Gas Geology, 2016, 37(5): 779-785.

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Characterization and genesis of the Middle and Late Eocene tectonic changes in Zhu 1 Depression of Pearl River Mouth Basin

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