辽宁清原王家大沟金矿床流体包裹体特征及矿床成因研究  

Study on fluid inclusion features and genesis of Wangjiadagou gold deposit in Qingyuan county,Liaolin province

作　　者：钱烨[1] 孙丰月[1] 张雅静[1] 马芳芳[1] 

机构地区：[1]吉林大学地球科学学院

出　　处：《黄金》2011年第10期17-22,共6页Gold

摘　　要：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NaCl-H2 O体系类型。成矿流体具有中等盐度(w(NaCl)为17.19%～22.88%)、低密度(0.73～0.92 g/cm3)的特点,成矿峰值温度为200～220℃,成矿平均压力27.73 MPa,成矿深度2.8 km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.

关 键 词：流体包裹体 矿床成因 造山型金矿床 王家大沟金矿床 

分 类 号：P618.51[天文地球—矿床学]