中文摘要:包裹体地球化学和氢氧同位素研究结果表明,淘金冲金矿床成矿溶液为中低温、中压、弱碱性和还原性的Ca-Mg-C-S体系,成矿溶液早期以变质水为主,中晚期则以建造水为主(大气降水来源),明显具混合成因特点,其矿床成因类型属受地下水改造成因的层控金矿或特征的“江南型”金矿。
Abstract:According to geochemical studies of inclusions in the Taojinehong gold Deposit, the ore-forming temperature of the deposit is 130~230℃, its ore-forming pressure is some 60~80 MPa, its cations in the ore-forming solution are mainly Ca2+ and Mg2+, its anions are chiefly HCO3- and HS-, its salinity is 3%~8% NaCl, its density is 0.88~0.97 g/cm3, and its ore-formingsolution shows weakly alkaline and reducing behaviors. In the ore-forming solution, gold is transported mainly in the form of [Au(HS)2]-, and the precipitation of gold is mainly attributed to the decrease in temperature, pressure, pH value and ∑S concentration. Hydrogen and oxygen isotope studies of the ore deposit show that the ore-forming solution is dominated by metamorphio water at the early stage and by formation water derived from meteoric water at the middle-late stage, showing obvious character of mixed genesis. The Taojinchong gold deposit derived its ore-forming materials from ore-control strata and its ore-forming energy from Xuefengian tectonism and metamorphism. Genetically, it is a stratabound gold deposit that has undergone reformation by groundwater or a characteristic"Jiangnan" type gold deposit.
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基金项目:国家自然科学基金和国家教委博士点基金资助项目
引用文本:
阎明,马东升,刘英俊.1994.淘金冲金矿成矿流体地球化学和矿床成因研究[J].矿床地质,13(2):156~162.1994.Ore-forming fluid geochemistry and genesis of the Taojinchong gold deposit[J].Mineral Deposits13(2):156~162
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