论内蒙大井铜-锡多金属矿区旋转构造体系

首次提出“旋转构造体系”在本区铜、锡的成矿上起着至关重要的作用,它控制着地层、岩脉、构造与矿脉的分布及产出.区内主要构造格架的特征表现为：在海西期构造的基础上,燕山期发生旋转,即在F1、F2等NE向压扭性左行断裂构造夹持的地块因剪切作用而发生整体顺时针的旋转;形成的配套构造包括呈羽状排布与同步剪切的近SN向的F3、F4、F5、F6压扭性断裂和NWW向张扭性断裂（矿脉主要充填于该组中）;同时造成矿区内地层、岩脉的走向与区域上的走向的极不协调.

ROTATIONAL STRUCTURE SYSTEM OF DAJING COPPER TIN POLYMETALLIC DEPOSIT IN INNER MONGOLIA

It is proposed for the first time that the so called rotational structure system played an extremely important role in copper and tin mineralization in the area and it controlled the distribution and occurrence of strata,dykes,structures and veins.The main structure framework in the region is characterized by the structure rotation in Yanshanian period based on the Hercynian tectonic structures,namely there was a total clockwise rotation happened in the terrain hold between NE striking compression-shear left lateral fractures as F_1 and F_2 etc by shearing process;a set of correlative structures were formed including plumose and in-phase shearing F_3,F_4,F_5,F_6 which are nearly SN striking and NWW striking tenso-shear fractures(with ore veins mainly filling in this group of fractures),at the same time,the occurrence discordance in Strata and igneous dykes between Dajing District(NWW striking) and the peripheral region(generally NE striking) was also occurred.