古构造应力场反演的理论与实践——基于断层滑动矢量分析  

Theory and Practice of Paleostress Field Inversion:Inferred from Fault Slip Vector Analysis

作　　者：陈鹏[1] 施炜[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081

出　　处：《地质论评》2015年第3期536-546,共11页Geological Review

基　　金：国家自然科学基金资助项目(编号41172184)的成果

摘　　要：古构造应力场恢复是重建区域地质演化历史的重要手段之一。断层作为地壳浅表发育的脆性变形构造,为恢复古构造应力场提供了重要地质条件。关于利用断层滑动矢量反演古构造应力场,前人进行了长期探索。目前其相关理论基础、研究方法与实际应用均取得重要进展。在断层滑动矢量反演古构造应力场的理论方面,改进的安德森模式描述了在发育先存薄弱带的情况下断层形成与演化的规律,克服了安德森模式只适用于均匀变形域的理论局限性;在研究方法方面,突破了在沉积盆地内部变形相对单一的限制,在造山带前陆或者叠加褶皱区等复杂变形区有效地开展了相关研究,并通过断层相关褶皱与同褶皱变形的滑动矢量分析,厘定出同造山作用的古构造应力场。这一方法在大巴山造山带强变形区得到了有效应用,为探讨其构造演化提供了基础。A certain regional tectonic evolution history can be rebuilt by paleostress fields analyzing; faults usually occur in uppermost crust,and extremely useful structures to determine paleostress field in a certain region.In this paper,we give an overview of new advances of the paleostress field theory,methods and application in a complex structural belt,as testified by a case study. A modified Anderson model,which was originated from a traditional Coulomb—Mohr shear failure theory,proposes how a fault do form and develop along a pre-existing weakness zone（ or pre-existing faults）,providing the base to analyze fault structures. Additionally some progress was made in reconstructing the paleostress field in a certain orogenic belt,which can be rebuilt by synfolding striae measurement and analysis. Then we give a case study on the paleostress in the Dabashan orogen by this way,showing this method is effective to analyze the paleostress field.

关 键 词：古构造应力场 断层滑动矢量 脆性变形 改进的安德森模式 大巴山造山带 

分 类 号：P541[天文地球—构造地质学]