甘新交界红柳河地区加里东晚期—海西早期韧性变形特征

THE FEATURE OF DUCTILE DEFORMATION TAKING PLAVE FROM EARLY CALEDONIAN TO LATER HERCYNIAN IN HONGLIUHE AREA LOCATED AT THE BOUNDARY BETWEEN GANSU AND XINJIANG

宏、微观构造特征研究表明 ,红柳河地区造山期韧性变形大致可分两个阶段。早期形成南倾的面理、东倾的拉伸线理、鞘褶皱 ,变形具右行逆冲剪切特点 ,有限应变分析表明具压扁变形特征。晚期变形形成红柳河主干背斜、西倾的拉伸线理及红柳河—前进工区左行逆冲走滑剪切带。根据变形岩石和未变形岩石年龄确定变形期为加里东晚期—海西早期 。

According to the study on the structural feature from macro to micro scale,the ductile deformation during orogenic period can be divided into two stages. The earlier generated the schistosity by southern trend, extensional lineation by eastern trend and Ashape fold with the shear feature of dextral obduction with flaser deformation indicated by analyses of finite strain. The later developed Hongliuhe major anticline, extensional lineation by western trend and HongliuheQianjingongqu shear zone of sinistral thruststrike slip. The deformation taking place from early Caledonian to later Hercynian can be concluded from the isotope of deformed and undeformed rocks , and the deformation feature shows that the structural layers belong to the middleupper synthem.