GEOMETRY CHARACTERISTIC OF THE FAULT SYSTEM IN XIHU SAG IN EAST CHINA SEA AND ITS FORMATION MECHANISM
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摘要: 断裂系统几何学特征研究表明,西湖凹陷断裂样式具有显著的"东西分带、南北分块"特征。西部斜坡带北部和南部为断阶式构造样式,中部的平湖斜坡带主要为单断式;中央-洼陷反转构造带自北向南构造样式呈规律性变化,反映出断裂反转强度自北向南减弱的趋势;东缘陡坡断隆带北部以西倾的同向断阶式为主,南部以东倾的反向断阶为主,中部黄岩边缘断裂带呈过渡特征。各主要构造带南北构造样式的转换部位也具有特殊的构造现象,凹陷中南部主要表现为晚期近E-W向断裂的集中发育,两侧NE、NNE向断层多尖灭或横向错移,中北部主要表现为断裂走向的变化。构造带南北构造样式的转换部多位于区域NW、NWW向基底断裂的延伸线上,这类NW、NWW向基底断裂多具有走向平移特征,据此,笔者认为这种构造特征的南北差异可能与早期NW、NWW向基底调节断裂的限制或再活动有关,在此基础上提出了西湖凹陷断裂样式南北差异的成因演化模式。Abstract: The geometry characteristic of the fault system in the Xihu Sag shows a feature of "East-West zoning and South-North blocking". The structural style in the northern and southern parts of the West Slope Zone is of faulted terrace type; but on the Pinghu slope, the central part of the West Slope Zone, mainly is of single fault type. The structural style changes regularly from north to south in the Central Subsag-Inverted Structure Zone, indicating that the fault inversion intensity weakened gradually from north to south. In the Eastern Margin, the northern part is characterized by west dipping faulted terraces, but in the southern part they are east dipping, and the Huangyan fault zone, central part of the Eastern Margin, is a transitional zone. Specific phenomena have been observed in the transitional zone. For examples, E-W faults are well developed in the middle-south sag of the transitional zone, and NE, NNE faults developed on both sides of this transitional zone and pinch-out or displace laterally. In the middle-north sag, the transitional zone is characterized by the change in faults direction. The transitional zone between the north and south are basically follow the regional strike-slip basement faults in NW, NWW direction. The South-North difference of the Structural style in the Xihu Sag may be caused by the reactivation of the NW, NWW faults.
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Key words:
- Xihu Sag /
- Fault system /
- Structural style /
- South-North difference /
- Formation mechanism
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