| 鄂东铅锌矿床成矿中磷酸盐生物和非生物还原作用的有机地球化学研究 |
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| 引用本文：胡明安,罗学常,高广立.1996.鄂东铅锌矿床成矿中磷酸盐生物和非生物还原作用的有机地球化学研究[J].地球学报,17(z1):97-103. |
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| 中文摘要:矿床产于三叠系大冶群碳酸盐岩中，有机质来自海相浮游生物和微生物。矿层中有机质发生成熟异常，已达过成熟作用早期。这得到镜质体反射率（Ro达4.6%）和矿物包裹体测温（均—温度达210℃）的证实。部分标本中有机质被微生物降解。硫同位素δ34S值大部分为正值，小部分为负值。综合研究表明在鄂东铅锌硫化物矿床的形成过程中，硫酸盐的生物和非生物还原作用，均具有十分重要的成矿意义。 |
| 中文关键词:大冶群碳酸盐岩 铅锌矿床 硫酸盐生物及非生物还原 |
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| Organic Geochemical Studies for Bilogical and Abiological Sulphate Reduction during Zn-Pb Sulphide Mineralization, Shizilishan-Fenglishan, Huangshi, Hubei |
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| Abstract:The organic carbon in the Lower Triassic Daye Group in Huangshi area, Hubei is of syngenetic origin, and its average content is comparable to that of similar rocks in the world. The primary organic mateer, belonging to kerogen of sapropel type (Ⅱtype), was derived from marine organisme, mainly algae. The origin and the mature anormaly of the organic mateer in Shizilishan-Fenglishan Zn-Pb deposit are determined in terms of studies of the microfacies, abundance, soluble species, saturated hydrocarbon and vitrinite re-flectance for the organic mateer in this deposit.
The organic matter in the mining area is comparatively high and unevenly distributed in ore-bearing karst breccias, which is over matured due to hydrothermal activities. The overmaturation of the organic matter in this deposit is confirmed by the data on the vitri-nite reflectance (R0=2.84%-4.66%)and the homogenization temperature of fluid inclu-sion (210℃). Theevident absence on the saturated hydrocarbon of the partial samples in the mining area resulted from intensive degradation by microorganisme whose participation is proved by the study on the sulphur istotpe (δ34S=-12.94‰)and the data on the ho-mogenization temperature of fluid inclusion (80℃).
The studies on organic geochemistry show that the sulfurated hydrogens which were responsible for Zn-Pb sulphide mineralization come from biological reduction of formation sulphate by sulphate reducing bacteria at a lower temperature (≈80℃)as well as from abiological reduction of this sulphate at a comparatively high temperature (≈210℃). |
| keywords:organic carbon in Daye Group Zn-Pb deposits biological and abiological Sulphate reduction |
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