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矿床地质  2011 

胶西北新城金矿成矿流体与矿床成因

Keywords: 地球化学,流体包裹体,稳定同位素,蚀变岩型金矿床,新城,胶西北

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Abstract:

新城金矿是胶东招远_莱州成矿带内重要的蚀变岩型金矿。流体包裹体研究表明,新城金矿蚀变岩石和各成矿阶段金矿石中的流体包裹体主要有3种类型:H2O-CO2包裹体、富CO2包裹体和H2O溶液包裹体。早期乳白色石英中主要赋存原生的H2O-CO2包裹体;成矿期黄铁矿石英脉中的富CO2包裹体主要为原生,随机分布,常与同时期的H2O溶液包裹体共生且均一温度接近;在成矿晚期的石英和方解石中主要发育原生H2O溶液包裹体。显微测温结果显示,完全均一温度:成矿早期H2O-CO2包裹体为310~380℃,主成矿期富CO2包裹体为240~315℃,同期的H2O溶液包裹体为209~311℃,成矿晚期H2O溶液包裹体为147~170℃。氢、氧同位素表明新城金矿成矿流体为岩浆水与大气水形成的混合热液,硫同位素进一步揭示了金矿的物质来源为以围岩S或壳源S与幔源S相互作用的结果。区域应力场转变导致的流体减压沸腾作用可能是新城金矿金沉淀成矿的主要因素。

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