印度尼西亚戴里Sedex型铅锌矿集区成矿流体特征及成矿物质来源:流体包裹体及同位素地球化学证据  

Characteristics of Mineralization Fluids and Mineralization Material Sources of the Sedex-type Dairi Pb-Zn Ore Concentration Area in Indonesia:Evidence from Fluid Inclusions and Isotopic Geochemistry

作　　者：张海坤[1] 胡鹏[1] 曹亮[1] 程湘[1] 战明国 潘罗忠 戴昱 潘贝红 Zhang Haikun;Hu Peng;Cao Liang;Cheng Xiang;Zhan Mingguo;Pan Luozhong;Dai Yu;Pan Beihong(Wuhan Center,China Geological Survey,Wuhan 430205,China;Guangxi Bureau of Geology and Mineral Prospecting and Exploitation,Nanning 530023,China;China-Asean Geoscience Cooperation Center(Nanning),Nanning 530023,China;Regional Geological Survey Institute of Guangxi Zhuang Autonomous Region,Guangxi Guilin 541000,China)

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205 [2]广西壮族自治区地质矿产勘查开发局,南宁530023 [3]中国东盟地学合作中心(南宁),南宁530023 [4]广西壮族自治区区域地质调查研究院,广西桂林541000

出　　处：《地质科技通报》2020年第3期170-177,共8页Bulletin of Geological Science and Technology

基　　金：中国地质调查局地质调查项目“印度尼西亚苏门答腊岛铜多金属资源潜力评价”(DD20160114);广西壮族自治区地质矿产勘查开发局地质勘查基金项目“广西与东盟特提斯构造过程与大规模成矿作用对比研究”(桂地矿外任[2018]1号)。

摘　　要：戴里铅锌矿集区位于印度尼西亚苏门答腊岛西北部,是一个主要产于页岩、具有巨型规模的Sedex型铅锌矿。通过系统的流体包裹体测试及H、O、S、Pb等同位素分析,以对其成因进行约束。分析结果表明:①戴里铅锌矿流体包裹体均一温度范围为189~315℃,峰值为220~240℃;②δD V-SMOW值范围为-68.7‰^-76.4‰,平均为-72.9‰,δ^18 O V-SMOW值范围为+5.9‰^+19.5‰,平均为+16.6‰;③黄铁矿δ34 S CDT值为正值,集中分布在+25.49‰^+26.36‰之间;④铅同位素显示较高的μ值(9.92~10.17,平均值为10.04)和ω值(38.06~40.51,平均值为39.26)。该矿床成矿流体温度为中温(220~240℃),成矿流体可能以岩浆水为主,有少量浅源水的加入,硫、铅均为单一来源,其中硫主要来自海水,铅来源于上地壳。The Dairi Pb-Zn ore concentration area,hosted by shale and displaying Sedex-type Pb-Zn mineralization of giant scale,is located in northwestern Sumatra,Indonesia.Systematic analysis of fluid inclusions and H,O,S and Pb isotopes was performed to probe its genesis.The results show that(1)the homogenization temperatures range from 189 to 315℃,with a peak at 220-240℃,indicating medium temperature for mineralization;(2)values ofδ^18 O V-SMOW vary from+5.9‰to+19.5‰,with an average of+16.6‰,implying a magma water-dominated mineralization fluid with minor addition of shallow water;(3)pyrites have positiveδ34 S CDT values from+25.49‰to+26.36‰;(4)lead isotopes possess highμvalues of 9.92-10.17(averaging 10.04)andωvalues of 38.06-40.51(averaging 39.26).It is indicated that the ores from Dairi formed at medium temperatures,having a fluid source dominated by magma water with minor addition of shallow water,a sulfur source comparable to ocean water and a single lead source from the crust.

关 键 词：印度尼西亚 戴里铅锌矿集区 SEDEX型 流体包裹体 硫铅同位素 

分 类 号：P618.4[天文地球—矿床学]