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甘肃阳山金矿碳氢氧同位素与成矿流体来源

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李晶,陈衍景,李强之,毛世东,秦艳,郭俊华,南争路,杨荣生. 甘肃阳山金矿碳氢氧同位素与成矿流体来源[J]. 岩石学报, 2008, 24(4).
引用本文: 李晶,陈衍景,李强之,毛世东,秦艳,郭俊华,南争路,杨荣生. 甘肃阳山金矿碳氢氧同位素与成矿流体来源[J]. 岩石学报, 2008, 24(4).
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The C-H-O isotope systematics of the Yangshan gold deposit, Gansu and its implication for the ore-fluid origin[J]. Acta Petrologica Sinica, 2008, 24(4).
Citation: The C-H-O isotope systematics of the Yangshan gold deposit, Gansu and its implication for the ore-fluid origin[J]. Acta Petrologica Sinica, 2008, 24(4).
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甘肃阳山金矿碳氢氧同位素与成矿流体来源

  • 基金项目:

    国家973计划2006CB403500项目、国家自然科学基金项目 , 科学院百人计划项目和武警黄金部队科研项目的资助

The C-H-O isotope systematics of the Yangshan gold deposit, Gansu and its implication for the ore-fluid origin

    摘要
  • 甘肃文县阳山金矿的探明黄金储量已达308t,平均品位4.74g/t,是我国地质勘查储量最大的金矿床.该矿床产于西秦岭造山带,是一个同碰撞形成的类卡林型金矿床,矿体受EW向韧脆性剪切带控制,赋矿围岩为泥盆系碳质千枚岩-板岩-碳酸盐-硅质岩和侵入其中的花岗斑岩脉.热液石英的流体包裹体之δ13CCO2(PDB)值为-2.5‰～-5.6‰,δ13CCH4(PDB)值为-23.1‰～-32.6‰,说明成矿流体来源于碳酸盐地层或相似岩石建造的变质或/和改造脱水作用.该结论尚被流体氢氧同位素研究结果所证明,成矿早阶段和主阶段流体的δ18OW值介于9.5‰～15.3‰,δDW值为-86‰～-73‰.两件矿化晚阶段流体的δ18OW氧分别为2.7‰和6.8‰,表明有强烈的大气降水热液混入.总体而言,成矿流体系统从早到晚、从深到浅.由变质热液演变为大气降水热液.特别补充说明,上述研究结果和认识与我们根据流体包裹体和矿床地质研究得出的结论相吻合.
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