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矿床地质  2003 

新疆红十井金矿床特征及成因

Keywords: 地球化学,金矿床,成因,红十井,新疆

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Abstract:

文章通过K-Ar同位素年龄,氢、氧、硫、铅等同位素测试和流体包裹研究,结合红十井金矿床的地质、矿区岩石化学、微量元素及稀土元素地球化学特征,探讨了红十井金矿床含金建造与金矿关系及矿床成因。研究表明红十井金矿床为晚古生代裂谷带火山岩区受韧性剪切带控制的中_低温热液矿床,矿体赋存于中石炭统玄武(玢)岩及凝灰质砂岩组成的含金建造内,成矿物质主要来源于含金建造,矿化以蚀变岩型和石英脉型为主。成矿年龄为209~267Ma。成矿流体为岩浆水、玄武(玢)岩和凝灰质砂岩的变质水、建造水和大气降水的混合溶液,δD为-114.6‰~-68.8‰,δ18OH2O变化为-2.47‰~5.91‰。成矿温度为115~381℃,成矿压力为471.8×105~675.9×105Pa;流体盐度w(NaCleq)为2.18%~16.77%,平均7.79%,流体属中-低盐度、H2O-CO2体系。

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