内蒙古固阳县席麻塔一带共轭剪切带的地质特征及形成机制

通过区调填图在内蒙古固阳县北山新太古代石英闪长岩和中元古代英云闪长岩中发现了韧性剪切带.通过野外调查、应变测量及显微构造、电子探针等方法研究表明, 该韧性剪切带为两组呈共轭组合型式产出, 形成机制与西伯利亚板块和华北板块相互挤压作用有关, 为在地球较深层次、在压扁环境下的简单剪切, 形成时代为中元古代末期, 变质相为绿片岩相. 

GEOLOGY AND FORMATION MECHANISM OF CONJUGATE SHEAR ZONE IN XIMATA REGION, GUYANG COUNTY, INNER MONGOLIA

The regional geological mapping in Beishan, Guyang County, Inner Mongolia, indicates the presence of the ductile shear zones in the Neo_Archaean quartz diorite and the Meso_Proterozoic tonalities. The field investigation, strain measurement, indoor micro_structure and electronic probe show that this ductile shear zone occurs as two groups of conjugate combinatorial shear zones. The formation mechanism of this conjugate shear zone, a simple shear that occurred at the end of the Meso_Proterozoic in the falser environment, is related to the compression between the Siberia plate and the North China plate. The metamorphic facies of this conjugate shear zone is the greenschist facies.