衡山变质核杂岩体西缘剥离断层及其对铀成矿的控制作用

ON DENUDATIONAL FAULT AND ITS CONTROL OVER URANIUM METALLOGENESIS AT THE WESTERN MARGIN OF HENGSHAN METAMORPHIC CORE COMPLEX

衡山变质核杂岩体是由元古界深变质岩和燕山期复式花岗岩体组成，其西缘的界牌剥离断层是区域深断裂的一部分，在断裂下盘出现糜棱岩－混合岩带具韧性变形特征，沿断裂已发现一些有意义的铀矿化。根据剥离断层控矿模式，提出在断裂上盘王冲－谢马冲地段寻找陡倾正断层与剥离断层交切处的隐伏铀矿的设想。

Hengshan metamorphic core complex is composed of Proterozoic kata-rnetarnorphicrocks and Yanshanian composite granitic massif,and the Jiepai denudational fault occurringat its western margin is a part of the regional deep faults. The mylonite-migrnatite zone appears at the footwall of the fault characterized by ductile deformation and some uranium rnineralization of economic significance has been discovered along the fault.on the basis of orecontrolling model for denudational fault,an idea is proposed to find concealed uranium deposits at the intersection between steeply inclined normal fault and denudational fault on thehanging wall of the fault in Wangchong Xiemachong area.