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矿床地质  2010 

黑龙江三道湾子碲化物型金矿床流体包裹体及硫同位素研究

Keywords: 地球化学,碲化物型金矿床,浅成中低温热液矿床,流体包裹体,硫同位素,三道湾子,黑龙江省

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Abstract:

三道湾子金矿床是新近发现的一个典型的碲化物型浅成热液金矿床,金银以碲化物形式赋存于石英脉中。含矿石英脉中石英内流体包裹体的主要类型为液体包裹体,其气相分数大多集中在5%~15%。对应于早矿化阶段、主成矿阶段、晚矿化阶段的流体包裹体的均一温度分别为230~396℃;220~320℃(峰值260~280℃);140~300℃(峰值180~240℃)。激光拉曼探针原位成分分析表明,各阶段流体包裹体的气、液相成分主要为H2O,部分气相含有甲烷、丙烷、丁炔等烃类;主成矿阶段的纯气体包裹体的成分为甲烷,其次为丙烷、丁炔等,可能是深源流体的启示。δ34S值在0附近,为较小的正值或负值,具有地幔硫的特征。上述分析揭示出,三道湾子金矿床是中低温热液矿床。伴随着早白垩世区域伸展作用期间的亚碱性火山作用,深源流体与大气水混合,促使热液携带的成矿物质在浅部地壳卸载、沉淀和结晶,并以裂隙充填占主导的成矿作用方式多阶段成矿。

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