江西东乡铜矿流体包裹体研究  

Study on the fluid inclusion from Dongxiang copper deposit,Jiangxi Province,China

作　　者：蔡逸涛[1] 倪培[1] 沈昆 朱筱婷[1,3] 黄苏锦 张秀昌 徐积辉 

机构地区：[1]南京大学内生金属矿床成矿机制研究国家重点实验室地质流体研究所地球科学与工程学院,南京210093 [2]山东省地质科学研究院,济南250013 [3]南京地质矿产研究所,南京210016 [4]江西铜业股份有限公司东同矿业公司,东乡331812 [5]江西铜业集团地勘工程公司,德兴334224

出　　处：《岩石学报》2011年第5期1375-1386,共12页Acta Petrologica Sinica

基　　金：全国危机矿山接替资源找矿项目(20089935)资助

摘　　要：本文主要对江西东乡铜矿成矿流体进行研究,探讨其成矿机制,分析成矿流体性质以及成矿流体来源。通过石英中流体包裹体的岩相学研究和显微测温可以发现,第一阶段石英中流体包裹体的温度介于144～195℃,流体盐度0.35%～4.95%NaCleqv,第二阶段的流体温度有所升高,均一温度193～298℃,盐度1.40%～6.59%NaCleqv。第三阶段属于成矿期流体,捕获了富气相、富液相和含子晶三相包裹体,其端员均一温度主要在300～340℃和280～320℃之间,盐度介于0.35%～5.86%NaCleqv和29.4%～41.9%NaCleqv之间。激光拉曼探针分析表明,拉曼探针分析反映了前两个阶段流体挥发份主要为水蒸气。第三阶段石英中流体包裹体的气相成分含有H2O、CO2和CH4。流体包裹体研究表明,东乡铜矿第三阶段的流体包裹体发生了明显的沸腾作用,因此,减压沸腾可能是导致流体中金属元素卸载的主要因素。同时,第三阶段流体的H-O同位素特征显示东乡铜矿具有岩浆水特征。According to the study on the metallogenic fluid characteristic from Dongxiang copper deposit,we examine the metallogenic mechanism,the nature and origin of ore-forming fluid.Based on petrographic observations of ore-bearing quartz collected from the deposit,we have found that there are three different generations of quartz.Fluid inclusion studies show that the homogenization temperature and primary salinities are 144~195℃ and 0.35%~4.95% NaCleqv in the first generation,respectively.The second generation formed in relatively higher temperature range 193~298℃,and salinities are 1.40%~6.59% NaCleqv.The thrid generation of quartz mainly consists of pyrite,chalcopyrite and quartz,the primary inclusions are generally three types：vapor（type II）,brine（type I）,and daughter-mineral bearing multiphase inclusions（type V）in the third generation.The statistics on the measured filling temperatures of type II and type V reveal peaks at 300~340℃ and 280~320℃ respectively,while those on the salinities of fluid inclusions peak at 0.35%~5.86% NaCleqv and 29.4%~41.9% NaCleqv respectively.Raman analysis of the fluid inclusions indicates that,in the gaseous phase,water vapor is dominant with small amount of CO2 and CH4.Hydrogen and Oxygen isotopic compositions are within the range of magmatic water.Fluid boiling resulted in the discharge of a large amount of copper from Cu-bearing fluid.

关 键 词：流体包裹体 显微测温 激光拉曼光谱 东乡铜矿 江西 

分 类 号：P618.41[天文地球—矿床学]