辽宁清原王家大沟金矿床位于华北克拉通北缘清原花岗-绿岩地体内,矿体为石英脉型;控矿构造为NEE向浑河断裂和NW向苏子河断裂,控矿岩体为中生代南口前岩体;成矿动力学背景为中生代碰撞造山过程的挤压-伸展转换期.矿床流体包裹体研究表明,包裹体以气液二相为主,成矿流体属于NaCI-H2O体系类型.成矿流体具有中等盐度(w(NaCI)为17.19%22.88%)、低密度(0.73-0.92g/cm3)的特点,成矿峰值温度为200-220℃,成矿平均压力27.73MPa,成矿深度2.8km左右.矿质卸载沉淀的主要原因为流体有限沸腾与单纯冷却.稳定同位素研究结果表明:矿床成矿流体来源以岩浆水为主,成矿物质主要来自幔源.综合研究表明,王家大沟金矿床成因类型属造山型金矿床.%Wangjiadagou gold deposit, in Qingyuan granite-greenstone terrain of North China Craton, was quartz vein type. NEE-direction Hunhe fault and NW-direction Suzihe fault in the area were the main ore-controlling structures, and the ore-controlling rock mass was Nankouqian rock mass. The metallogenic dynamics background was the transition from Mesozoic era collisional compression to extension. Features of fluid inclusions were characterized by NaCl-H2O system, medium salinity(17.19 % -22.88 %) , low density(0.73 -0.92 g/cm3)and medium temperature (200 -220 ℃ ). The average pressure of ore-forming was 27.73 Mpa and the metallogenic depth was about 2. 8 km. Ore-depositing was mainly caused by limited boiling and pure cooling of fluids. Stable isotope research results indicated that the ore-forming fluids derived from the magmatic hydrothermal, while metals mainly generated from mantle. Comprehensive studies have suggested that Wangjiadagou gold deposit belonged to orogenic gold deposit.
展开▼
