辽宁东五家子金矿地球化学特征研究  

Geochemical features of the Dongwujiazi gold deposit,Liaoning Province

作　　者：朴寿成[1] 师磊[1] 杨明亮 王宝岩 常国林 

机构地区：[1]吉林大学 [2]辽宁朝阳万华企业集团

出　　处：《黄金》2007年第12期7-11,共5页Gold

摘　　要：东五家子金矿矿脉主要围岩为太古宙建平群小塔子沟组变质杂岩，矿床距燕山期石英二长岩南约6kin。该金矿成矿流体的温度为168℃，主要在150℃～185℃之间变化；盐度（S）为8．5％NaCl，主要在6％～11％之间变化；成矿压力为41．8×10^6～46．0×10^6Pa，矿化深度为1．39～1．84km，是低温浅成热液矿床。成矿流体为岩浆水和大气降水的混合源，矿石中黄铁矿和方铅矿δ^34S的变化范围为1．91‰～3．14‰，矿石中的硫可能来自上地幔。局部矿脉产状变缓，石英脉透镜体存在，并出现中一细粒它形一半自形粒状黄铁矿、方铅矿等硫化物是富矿体存在的标志。盐度（S）和K2O／Na2O比值都可用于预测矿脉的标高（H）或剥蚀程度。The gold lodes in the Dongwujiazi gold deposit are mainly hosted in the metamorphic complex of the Archean Xiaotazigou Formation, Jianping Group. The deposit is 6 km from a Mesozoic quartz monzonite. The temperature of the ore fluid changes between 150℃ and 185℃and is averaged at 168℃. Their salinity（S）varies in a range of 6% - 11% of NaCl, averaged at 8.5% ;The ore-forming pressure is around 41.8 ×10^6 - 46.0 × 10^6Pa, corresponding a mineralizing depth of 1.39 - 1.84 km. The ore fluid is suggested to be derived from a mixing sources of magmatic and meteoric waters. The δ34S value of pyrite and galena in ores is from 1.91‰ - 3.14‰, indicating a upper mantle source for sulphur. Local gentle dipping of the lodes, presence of quartz lenses, and concentration of the medium -small, xenomorphic grained pyrite and galena indicate the sites of richer ores. Both the salinity（S） and ratio of K2O/Na2O could be used to predict the altitude of the lodes or their erosion degrees.

关 键 词：东五家子金矿 流体包裹体 稳定同位素 元素地球化学 

分 类 号：P618.51[天文地球—矿床学]