基岩区断裂活动习性研究方法初探——以殷家汇-葛公镇断裂研究为例

A preliminary study of the method for the investigation of action behavior of faults in bedrock area ——Taking the investigation of the Yingjiahui-Gegongzheng Fault as example

对安徽省殷家汇葛公镇断裂旁侧方解石脉进行了野外考察和显微观测。露头上可识别出多期变形事件 ,显微镜下也能鉴别出脉的不同期次的变形特征和变形强度 ,脉的变形强度表现为从早期到晚期 ,脉的变形形态和组构从复杂趋于简单 ,方解石机械双晶从多组、弯曲趋于单组、平直。压性或压剪性脉体变形以交错揉皱为其主要特征 ,而张性、张剪性脉体则多表现为破裂、砾化等脆性变形形态。殷家汇葛公镇断裂宏观和微观系统分析研究为基岩区断裂活动期次及各期变形特征的鉴别研究提供了一个实例。

Field investigations and microscopic observations have been made of the calcite veins near Yingjiahui Gegongzheng Fault in Anhui Province As a result, multiple phases of deformation events can be identified in field and different characters and intensities of deformation can be distinguished for different phases of deformation of the veins under microscope too According to the microscopic results, from the early stage to the later stages of deformation, the following trend of changes can be observed; the forms and fabrics of the veins' deformation: Complex→simple; the mechanical twins of calcite: multiple group→single group;distorted twins→flat twins The deformation in compressive or compresso shear vein bodies is characterized by cross crumpling mainly, whereas the deformation forms of tensile or tensile shear veins are often expressed as some kind of brittle deformation, such as ruptures and gravels The macroscopic and microscopic analysis and investigations of Yingjiahui Gegongzheng Fault have provided a real example for distinctive study of the action phases and the deformation characters of these phases of the faults in bedrock areas