河南祁雨沟金矿流体包裹体及矿床成因类型研究  

Study of fluid inclusions and ore genetic type of the Qiyugou gold deposit,Henan

作　　者：李诺[1] 赖勇[1] 鲁颖淮[1] 郭东升[1] 

机构地区：[1]北京大学造山带与地壳演化重点实验室,北京100871

出　　处：《中国地质》2008年第6期1230-1239,共10页Geology in China

基　　金：国家"973"项目(2006CB4035008和2006CB403501);国家自然科学基金项目(40352003和40425006)资助

摘　　要：河南祁雨沟金矿位于华北克拉通南缘的熊耳地体,产于燕山期火山隐爆角砾岩筒内。流体包裹体研究表明,祁雨沟金矿不同成矿阶段的石英中的流体包裹体有3种类型:水溶液包裹体、含子矿物包裹体和含CO2包裹体。成矿早期流体为高温(>350°C)、高盐度(>30wt%NaCl.eqv)、高氧逸度、富CO2的岩浆流体,经流体减压沸腾、挥发分逸失、氧逸度降低、温度降低演化为导致大量金属硫化物及金沉淀的还原性流体,再经大气降水的混入和降温等过程,演化为晚阶段低温、低盐度的大气降水热液。祁雨沟金矿的地质和成矿流体特征指示其应为爆破角砾岩型,而非浅成低温热液型。The Qiyugou gold deposit, Songxian County, Henan Province, is associated with subvolcanic breccia pipes in the Xiong＇er terrane, southern margin of the North China craton. In hydrothermal quartz three types of fluid inclusions can be observed. They are H2O-rich, daughter mineral-bearing, and CO2-rich. The initial ore- forming fluids are magmatic in origin and characterized by high temperature （〉350℃）, high salinity （〉30wt% NaCl.eqv）, high oxygen-fugacity and CO2-rich. Then the fluids boiled and resulted in CO2-release, oxygen- fugacity decrease and rapid precipitation of ore-forming materials. The late stage fluids, characteristic of low temperature, low salinity and lack of daughter mineral, could be sourced from meteoric water. The ore-forming fluid system and geological characteristics of the Qiyugou gold deposit suggest that it is a typical explosive breccia-type gold deposit, instead of an epithermal-type deposit.

关 键 词：流体包裹体 爆破角砾岩型金矿 祁雨沟 河南 

分 类 号：P618.51[天文地球—矿床学]