内蒙古查干通格地区中浅构造相韧性剪切变形特征及构造运动学意义

内蒙古查干通格地区中浅构造相韧性剪切变形地质体中构造形迹保存较好的有柳树沟岩组绢云石英片岩、石英岩，祖宗毛道基性岩墙和哈拉霍疙特组三段灰岩.变形岩石片理、矿物拉伸线理均非常发育，在不同构造部位和不同岩性中，矿物的变形特征存在明显差异，出现不同的构造样式.白云鄂博群哈拉霍疙特组三段灰岩中发育大量同斜倒转褶皱，且矿物拉伸线理与褶皱枢纽平行；绢云石英片岩中发育大量杆状构造、鞘褶皱.矿物拉伸线理、杆状构造均属a型线理，其延伸平行剪切运动方向.横向上中间变形强，向两侧逐渐变弱.宏观及微观的“S-C”组构、“云母鱼”等指示的运动方式为北东东向的斜下落剪切运动，变质程度为低绿片岩相.

THE DUCTILE SHEARING DEFORMATION OF MEDIUM-SHALLOW STRUCTURAL FACIES AND KINEMATICAL IMPLICATION IN CHAGANTONGGE AREA,INNER MONGOLIA

The ductile shearing deformation of medium-shallow structural facies in Chagantongge area,Inner Mongolia is developed in the sericite-quartz schist and quartzite of Liushugou rock formation,limestone of the third member of Halahuogete formation and basic dyke in Zuzunmaodao.The characteristics of mineral deformation vary obviously in different structure positions and rocks.Overturned isoclinal folds with mineral stretching lineation occur in limestone.Rodding structure and sheath fold are developed in sericite-quartz schist.The mineral stretching lineation and rodding structure,extending paralleled to the direction of shearing deformation,belong to a-type of lineation.Horizontally,the deformation is strong in the center of the shear deformation zone,while weak outwards.Macroscopic and microscopic characteristics,such as S-C fabrics and ＂mica fish＂,indicate a NEE-trending inclined shearing movement,with low greenschist facies of metamorphism.