印度尼西亚索林帕萨铜多金属矿成矿流体地球化学和矿床成因  

Geochemistry of Ore-Forming Fluids and Genesis of Soripesa Cu-Polymetallic Deposit in Indonesia

作　　者：梁业恒[1] 孙晓明[1,2] 翟伟[1] 李爱菊[1,2] 徐莉[1] 汤倩[1] 梁金龙[1] 

机构地区：[1]中山大学地球科学系,广州510275 [2]中山大学有色金属华东地勘局隐伏矿床勘查研究院,南京210007

出　　处：《地质与勘探》2009年第1期41-45,共5页Geology and Exploration

基　　金：江苏省有色金属华东地质勘查局委托研究项目(编号:32110-4206243)资助

摘　　要：文章对印度尼西亚索林帕萨铜多金属矿含矿石英脉流体包裹体进行了显微测温与氢氧同位素测定,发现石英脉中含有3种类型的流体包裹体:A.纯液相水溶液包裹体;B.富液相气液两相水溶液包裹体和C.富气相气液两相水溶液包裹体,其中以B类为主。三种流体包裹体同时出现,表明石英脉形成时流体可能发生过沸腾作用。成矿流体均一温度为198.9℃~356.4℃,冰点温度为-0.6℃^-2.3℃,相应流体盐度变化范围为0.94%~3.76%NaCleq.。质谱测定显示成矿流体的氢氧同位素组成分别为δDH2O=-61.0‰^-81.0‰,δ18OH2O=-3.08‰~0.17‰,表明成矿流体主要为大气降水,不排除有少量岩浆水加入。根据成矿流体地球化学与围岩蚀变类型,初步推断该矿属于酸性-硫酸盐(高硫)型的浅成低温多金属矿床,沸腾作用是成矿物质沉淀的主要因素。Three types of fluid inclusions were recognized in the mineralized quartz veins from Soripesa Cu -polymetallic deposit in West Nusa Tengo gara, Indonesia. They are： A. liquid aqueous inclusions, B. liquid - rich two - phase fluid inclusions, and C. gas - rich two - phase inclusions. The type B predominates in the fluid inclusions. Coexisting of different types of inclusions with greatly - varied vapor/liquid rations implies that boiling might have occurred during formation of the mineralized quartz veins. The ice melting temperatures of the fluid inclusions range from -0. 6℃ to -2.3℃, and the corresponding salinities of the ore - forming fluids vary from 0.94% to 3.76% NaCl eq. The homogenization temperatures vary from 198.9℃ to 356.4℃. Besides, mass spectrometer analyses show that δDH2O and δ^18OH2O of the fluid inclusions are - 61.0‰ to - 81.0‰ and - 3.08‰ to 0.17‰ respectively, indicating that ore - forming fluids for the Soripesa Cu - polymetallie deposit were composed mainly of meteoric water, with involvement of magmatie fluids. Based on the characteristics of the ore - forming fluids and wall rock alteration at the edge of the mineralized quartz veins, we preliminarily proposed that the deposit belongs to a high sulphidation epithermal polymetallic deposit, and boiling might have played an important role in the mineralization.

关 键 词：流体包裹体 浅成低温热液矿床 沸腾作用 索林帕萨矿区 印度尼西亚 

分 类 号：P618.41[天文地球—矿床学]