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东海西湖凹陷断裂系统几何学特征及其成因机制
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东海西湖凹陷断裂系统几何学特征及其成因机制
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Journal Article
东海西湖凹陷断裂系统几何学特征及其成因机制
2014
Overview
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。
