| 滇黔交界地区玄武岩铜矿同位素地球化学特征 |
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| 引用本文：.2004.Isotopic Geochemistry of Emeishan Basalt Copper Deposits in Northeastern Yunna n and Western Guizhou[J].Mineral Deposits,23(2):132~240 |
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| 基金项目:中国地质调查局地质调查课题(200310200002)和国家重点基础规划发展项目(G1999043211） |
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| 中文摘要:对滇黔交界地区玄武岩铜矿进行了同位素地球化学示踪。铜矿石 中沥青δ13CPDB为-33.1‰～-30.9‰，炭质δ13CPDB为-2 3.2‰～-20.2‰；方解石的δ13CPDB一般为-13.5‰～-19.4‰，δ18OSMOW一般为19.0‰～23.5‰；石英流体包裹体水δD为-69‰～-89‰，δ18O石英-SMOW为15.7‰～17.4‰，与其平衡的流体的δ18O水-SMOW为2.2‰～3.9‰；各种矿物的铅同位素组成一般为206Pb/204Pb 17.855～18.923，207Pb/204Pb 15.503～15.694，208 Pb/204Pb 38.293～39.036；辉铜矿δ34SCDT为19.2‰和20.7‰。这些特征综合显示峨眉山玄武岩铜矿的成矿作用与盆地流体的对流循环及从玄武岩中萃取成矿物质有关，有机质对成矿流体的还原和对成矿物质的吸附作用可能是成矿的重要机制。 |
| 中文关键词:地球化学 有机碳同位素 碳氧同位素 氢氧同位素 铅同位素 硫同位素 铜矿 玄武岩 |
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| Isotopic Geochemistry of Emeishan Basalt Copper Deposits in Northeastern Yunna n and Western Guizhou |
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| Abstract:This paper has studied isotopic geochemistry of basalt copper deposits in northe ast Yunnan Province and west Guizhou Province. δ13CV-PDB of bitumen from copper ore in basalts and carbonaceous matter from copper ore in carbonace ous sedimentary rocks are from -33.1‰ to -30.9‰ and from -23.2‰ to -20.2‰, r espectively. δ13CV-PDB and δ18OV-SMOW of calcite from copper ore are generally from -13.5‰ to -19.4‰ and from 19.0‰ to 23.5‰, respectively. δDV-SMOW and δ18OV-SMOW of quartz from copper ore are from -69‰ to -89‰ and from 15.7‰ to 17.4‰, respectively, and the δ18OH2O-SMOW of fluids are from 2.2‰ to 3.9‰.206Pb/204Pb,207Pb/204Pb and 208Pb/204Pb of minerals from copper deposits are generally from 17.855 to 18.923, from 15.503 to 15.694 and from 38.293 to 39.036, respectively. The δ34SV-CDT of chalcocite from copper ore are 19.2‰ and 20.7‰. All these data suggest that Emeishan basalt copper deposits are epigenetic hydrothermal ones, and thei r mineralization is related to the convection of basin fluid and its extraction of copper from basalt as well as to the reduction and adsorption action of organ ic matters. |
| keywords:geochemistry, organic carbon isotope, C-O isotope, H-O isotope, Pb isotope, S isotope, copper deposit, basalt |
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