内蒙古乌拉特中旗查干此老金矿床地质特征及成因

Geological Characteristics and Origin of Chagancilao Gold Deposit in Urad Zhongqi，Inner Mongolia

摘要:

查干此老金矿位于内蒙古自治区乌拉特中旗境内，为岩浆热液型金矿床。该文系统阐述了查干此老金矿区地层、构造及岩浆岩特征，详细介绍了金矿床地质特征。通过对查干此老矿床的地质特征、控矿因素及矿床成因的系统研究，认为矿区的金矿化类型以含金石英脉型为主，兼有破碎蚀变岩型。金矿体赋存于二叠纪斜长花岗岩及志留纪蚀变闪长岩中的石英脉、碎裂岩带及糜棱岩带中，其产状、形态、规模严格受NE向断裂构造带控制，未受后期构造影响。该文对查干此老金矿床的构造背景、物质来源进行了研究，确定了该矿床的成矿模式，对该区的金矿成矿预测，深部及外围找矿工作具有一定的指导意义。

Abstract:

Chagancilao gold deposit located in Urad Zhongqi, Inner Mongolia. It is a magmatic hydrothermal type gold deposit. With discussion on the characteristics of strata, structures and magmatic rocks in Chagancilao gold deposit, geological characteristics have been introduced in detail. Through study on geological characteristics, orecontrolling factors and origin of Chagancilao gold deposit, it is regarded that main type gold mineralization is gold-bearing quartz vein type, accompanying with cataclastic altered rock type. Gold ore bodies occur in Permian plagioclase granite and quartz vein, ataclastic rock and mylonite in Silurian alteration diorite. Its occurrence, morphology and size are strictly controlled by the fracture tectonic zone with the trend of NW without tectonic effects. In this paper, tectonic background and the material sources of Chagancilao gold ore deposit have been studied. The metallogenic model of Chagancilao gold deposit has been determined. It has some guiding significance for gold metallogenic prognosis by using the model.