| 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 |
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| 引用本文： | 张海坤,胡鹏,曹亮,程湘,战明国,潘罗忠,戴昱,潘贝红.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[J].地质科技通报,2020,39(3):170-178. |
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| 作者姓名： | 张海坤 胡鹏 曹亮 程湘 战明国 潘罗忠 戴昱 潘贝红 |
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| 基金项目： | 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 |
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| 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℃；②δDV-SMOW值范围为-68.7‰~-76.4‰，平均为-72.9‰，δ18OV-SMOW值范围为+5.9‰~+19.5‰，平均为+16.6‰；③黄铁矿δ34SCDT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。
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| 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 |
| 收稿时间： | 2019-01-27 |
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 |
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| Abstract: | 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 of δ18OV-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 positive δ34SCDT values from +25.49‰ to +26.36‰; (4)lead isotopes possess high μ values of 9.92-10.17(averaging 10.04) and ω values 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. |
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