| 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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| 关键词:organic carbon in Daye Group Zn-Pb deposits biological and abiological Sulphate reduction |
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| Organic Geochemical Studies for Bilogical and Abiological Sulphate Reduction during Zn-Pb Sulphide Mineralization, Shizilishan-Fenglishan, Huangshi, Hubei |
| 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℃). |
| Hu Mingan,Luo Xuechang,Gao Guangli.1996.Organic Geochemical Studies for Bilogical and Abiological Sulphate Reduction during Zn-Pb Sulphide Mineralization, Shizilishan-Fenglishan, Huangshi, Hubei[J].Acta Geoscientica Sinica,17(z1):97-103. |
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