内蒙古朱拉扎嘎金矿床成矿特征及其与穆龙套型金矿床的异同性

摘要

内蒙古朱拉扎嘎金矿床是一个低品位、规模大,并具有细脉-微细脉浸染和蚀变特征的金矿床.矿床赋存于中新元古代沉积变质岩中,受层间破碎带的控制.矿石矿物组成有金属硫化物石英、长石,少量方解石、黏土矿.金以晶隙金为主,成矿溶液主要来自岩浆热液活动,成矿温度平均在286℃,成矿物质来源既有赋矿地层的提供,也有深部物质的参与.该矿床在成矿地质背景、赋矿岩石、矿化形成、矿物组合和成矿作用等方面均与穆龙套型金矿床具有可对比性.%The Zhulazaga gold deposit in Inner Mongolia is characterized by large reserves,low grade and intense alteration and dissemination of veinlet and micro-veinlet.The deposit occurs in the Meso-Neoproterozoic sedimentary metamorphic rocks,controlled by interlayer fracture zones.Sulfides are the dominant ore minerals,with quartz,feldspar and minus calcite and clay minerals.The gold is mainly of intercrystalline.The ore-forming fluid is derived mainly from magmatic hydrothermal activities,with average temperature of 286 ℃.The ore materials are originated mainly from the host strata and partially from the deep.As for its geological setting,ore-hostingrock,metallogenesis and mineral assemblage,the Zhulazaga gold deposit is comparable with the Muruntau gold deposit.