STRUCTURAL PATTERN DURING THE RIFTING STAGE OF THE XIHU SAG AND ITS CONTROL OF SEDIMENT INFILLING
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摘要: 西湖凹陷裂陷期构造主要是指从断陷开始形成(Tg界面)至始新世末(T30界面)的构造,它控制着盆内裂陷期地层的发育和沉积体系的总体展布特征。裂陷期原盆地的构造格架总体为一复杂的半地堑结构,主要受控于三组NE向的断裂带:东缘陡坡断裂带、中央洼陷断裂带、西部缓斜坡断裂带。西湖凹陷裂陷期古构造格局对裂陷期构造层序沉积、沉降中心的分布及迁移具有重要的控制作用。裂陷期沉积-构造事件具有幕式特征,是对晚中生代时期开始的太平洋板块相对于欧亚板块俯冲作用的局部响应。Abstract: The structures of the Xihu Sag in the rifting stage include those formed from the onset of rifting(boundary Tg) up to the Late Eocene(Boundary T 30)in this paper.The Structural pattern is the factor controlling over the development of stratigraphy and the spatial distribution of depositional systems.The prototype of the basin during the rifting stage is a complicated half graben controlled by three groups of fault zone,i.e.the fault zone on east steep slope,the fault zone in central depression,and the fault zone on west gentle slope,all extending in NE direction. The plaeo-structural pattern of the Xihu Sag during the rifting stage plays significant roles in the formation of sedimentary sequences,and the distribution and shifting of depositional and subsidence centers. The sedimentation and tectonic events are episodic as a local response to the subduction of the Pacific plate under the Eurasian plate starting from the late Mesozoic.
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Key words:
- Xihu Sag /
- rifting stage /
- structural pattern /
- depocenter /
- subsidence center
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