| 双王角砾岩型金矿床地质地球化学及成矿机制 |
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| 引用本文：.2004.Geology, Geochemistry and Metallogenic Mechanism of Shuangwang Breccia Type Go ld Deposit [J].Mineral Deposits,23(2):241~252 |
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| 基金项目:国家重点基础研究发展规划项目(No. G1999043211) |
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| 中文摘要:文章在对双王角砾岩型金矿床地质特征进行简要描述的基础上，探讨了含 金角砾岩体的成因，系统地研究了流体包裹体的特征和矿石碳、〖JP3〗氢、氧同位素的组 成。结果表明双王金矿床成矿流体以富CO2、高温、中低盐度为特征，碳明显具有深源(幔 源)特征，而成矿流体以典型岩浆水为主，混入有一定程度的变质水，在成矿作用晚期可能 有大气降水加入到成矿系统中。结合区域地质构造背景和成岩成矿年代资料，探讨了双王金 矿床的成矿作用和成矿机制。 |
| 中文关键词:地球化学 流体包裹体 碳、氢、氧同位素 成矿机制 双王金矿床 |
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| Geology, Geochemistry and Metallogenic Mechanism of Shuangwang Breccia Type Go ld Deposit |
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| Abstract:Based on a description of geological characteristics of the Shuangwang gold depo sit in the West Qinling orogenic belt and a discussion on the origin of its auri ferous breccia body, this paper deals emphatically with the fluid inclusions and the carbon, hydrogen and oxygen isotopes of the ores. Fluid inclusion studies o f both ankerite from the main ore_forming stage and quartz from the late stage s how that the fluid inclusions can be divided into three compositional types, i.e . CO2_H2O, CO2_rich and aqueous ones. The homogenization temperatures of t he aqueous and CO2_H2O inclusions in ankerite of the main stage display wide temperature ranges of 130～370℃ and 260～400℃, but with the same peak of 330 ℃. The salinity of the two_phase aqueous inclusion ranges from 4.00% to 22.70% w(NaCleq), with a peak of 10.0 %, and that of CO2_H2O inclusions between 1.03% and 6.63% w(NaCleq). The CO2_NaCl_H2O fluid is the m ain ore_forming fluid characterized by enrichment of CO2, low salinity and hig h temperature. The δ13C values of ankerite range mainly from -5.6‰ to -7 .8‰, probably suggesting that the carbon in ores of the Shuangwang gold deposit was mainly derived from the great depth. The hydrogen and oxygen isotope analys es show that magmatic water was the dominant ore_forming fluid with the mixture of some metamorphic water in the ore_forming process of the main ore_forming sta ge. Besides, some amounts of meteoric water were involved in mineralization in t he late ore_forming system of the Shuangwang gold deposit. |
| keywords:geochemistry, C, H, and O isotope, fluid inclusion, metallogenic mechanism, Shuangwang gold deposit |
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