安徽肥东西韦地区郯庐断裂带的构造特征与变形规律

郯庐断裂带南段安徽肥东西韦地区糜棱岩广泛发育,地表出露良好。通过对该地区进行细致的宏观和微观分析研究发现,韧性剪切带具有典型的左行平移特征;断裂带的持续走滑使糜棱岩带抬升并在浅层形成正花状构造;新生代以来由于太平洋板块近EW向的强烈挤压,左行平移逆断层形成,并叠加于早期构造之上,从而形成当今地表所见的构造特征。

Tectonic characteristics and evolution of the Tan-Lu fault zone in the Xiwei area, Feidong County, Anhui Province

In the Xiwei area of Feidong County,Anhui Province,which is located in the south of the Tan-Lu fault zone,mylonite developed widely and exposed well to the surface of the earth.Through macroscopic and microscopic researches,it is found out that the ductile shear belt has the typical characteristic of left-slip,that the consistent strike-slip of the Tan-Lu fault zone makes the mylonite belt hoisted and generates the positive flower structure in the shallow subterranean area,and that from Mesozoic on,the violent stress of the pacific plate,approximately from east to west,made the slip-thrust fault take shape,which was imposed on the former structure only to demolish the mylonite belt existing previously more or less.