滇东北茂租大型铅锌矿床成矿物质来源及成矿机制
SOURCES OF ORE-FORMING METALS AND FLUIDS, AND MECHANISM OF MINERALIZATION,MAOZU LARGE CARBONARE-HOSTED LEAD-ZNIC DEPOSIT, NORTHEAST YUNNAN PROVINCE
查看参考文献34篇
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文摘
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茂租铅锌矿床地处扬子地块西缘,是川滇黔铅锌成矿域内赋存于震旦系灯影组白云岩中大型铅锌矿床的典型代表。其工业矿体呈似层状、脉状和不规则状。热液方解石和矿石硫化物(闪锌矿、方铅矿和黄铁矿)是主要矿物,其形成贯穿整个成矿过程。在矿床地质特征解析基础上,获得了热液方解石C-O同位素和矿石硫化物S-Pb同位素数据,结果表明热液方解石δ~(13) C_(PDB)值和δ~(18) O_(SMOW)值变化范围较窄,分别为-3.73‰~-1.95‰和+13.80‰~+14.95‰,在δ~(13) C_(PDB)与δ~(18) O_(SMOW)图上介于海相碳酸盐岩和原生碳酸岩范围间,呈弱负相关趋势,表明成矿流体中的CO_2主要由海相碳酸盐岩溶解作用形成,并存在慢源和有机CO_2加入;硫化物δ~(34) S_(CDT)值介于+13.35‰~+15.37‰,暗示成矿流体中的硫是海相硫酸盐岩热化学还原的产物,而含硫有机质热降解也有贡献;硫化物Pb同位素组成稳定,~(206)Pb/~(204)Pb,~(207)Pb/~(204)Pb和~(208)Pb/~(204)Pb值范围,分别为18.129~18.375,15.644~15.686和38.220~38.577,位于上地壳和造山带Pb演化线之间,落入基底岩石(昆阳群和会理群)Pb同位素组成范围内,表明成矿物质具有壳源特征,主要由基底岩石提供。综合各类地质-地球化学信息,认为茂租铅锌矿床成矿流体中不同组分来源不同,具有"多来源混合"特征,其成矿机制可以用"流体混合"模式来解释。 |
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其他语种文摘
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The Maozu Pb-Zn deposit, a typical large Pb-Zn deposit in Sichuan-Yunnan-GuizhouPb-Zn metallogenic province, is located on the western margin of Yangtze Block and hosted in thedolomite of Dengying Formation of Upper Sinian. The industrial ore-bodies are stratiform-like, vein and irregular shaped. Hydrothermal calcite and sulfide(sphalerite, galena and pyrite)are themain gangue and ore minerals, which were formed throughout the ore-forming process. C-O iso-topic compositions of hydrothermal calcites, S-Pb isotopic compositions of sulfides were analyzedin this paper. It was showed that δ~(13)C_(PDB)and δ~(18) O_(SMOW)values of hydrothermal calcites varied in anarrow range of -3.73‰ to -1.95‰ and +13.80‰ to +14.95‰, respectively. All the samplesare plotted into the field between the marine carbonate and mantle in the diagram of δ~(13)C_(PDB) vs δ~(18) O_(SMOW), and show a weak negative correlation, implicating that the CO_2 in the ore-forming fluidswere mainly produced by dissolution of marine carbonate, and contributed by organic and mantleCO_2. δ~(34) S_(CDT) values of sulfides separates range from +13.35‰ to +15.37‰. It shows that thereduced sulfur in the ore-forming fluids is the production of thermo-chemical sulfate reduction, and added by thermal degradation of sulfur-bearing organic matter. ~(206)Pb/~(204)Pb, ~(207)Pb/~(204)Pb and ~(208)Pb/~(204)Pb ratios of sulfide separates have a narrow range of 18.129to 18.375, 15.644to 15.686和38.220to 38.577, respectively, which lies in the region between Upper Crust and orogenic Pbarea, and plots into the field of basement rocks(Kunyang and Huili Groups), indicating that thecrust source features of ore-forming metals mainly supplied by basement rocks. All the geologicaland geochemical information show that the source of ore-forming metals and fluids of the MaozuPb-Zn deposit is mixed product and the mechanism of mineralization could be explained by "fluidsmixing" model. |
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来源
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矿物岩石
,2012,32(3):62-69 【核心库】
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关键词
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C-O-S-Pb同位素
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成矿物质和流体来源
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流体混合
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茂租大型铅锌矿床
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地址
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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昆明理工大学国土资源工程学院, 云南, 昆明, 650093
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成都理工大学地球科学学院, 四川, 成都, 610059
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语种
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中文 |
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ISSN
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1001-6872 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:4673542
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