湖南涟源凹陷构造解析

通过野外地质露头调查、绘制剖面图以及航磁资料分析等一系列方法,按不同的构造特点将涟源凹陷分为西部、中部、东部三个构造亚带。西部构造带主要是一系列断面倾向南东的逆冲推覆构造;中部构造带主要构造要素是双冲式断裂系统和隔档式褶皱组合;东部构造带主要构造要素是断面倾向北西的叠瓦状逆冲断裂带。结合各个构造带的构造特征,进一步分析了其构造的形成机理,总结出了涟源凹陷的构造应力发展史。

An analysis of structures in Lianyuan sag in Hunan province

Based on field outcrop survey, profile mapping and aeromagnetic data study, the Lianyuan sag is divided into the western, central and eastern structural sub- areas according to the structural features. The western structural belt is mainly consisted of a series of overthrust structures with SE- dipping fault planes. The major structural elements of the central structural belt are the combinations of double thrust fault system with ejective folds. While that in the eastern structural belt are imbricated thrust faults with NW dipping fault planes. In combination with the characteristics of each structural belt, the formationmechanisms of these structures are analyzed and the history of tectonic stress of Lianyuan sag is summarized.