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矿床地质  2008 

黑龙江省东宁县金厂金矿床角砾型铜金矿体流体包裹体研究

Keywords: 地质学,金厂超大型铜金矿床,角砾型铜金矿体,矿物流体包裹体,黑龙江省,黑龙江省,东宁县,金厂金矿床,角砾岩,铜金矿体,流体包裹体,研究,golddeposit,inclusions,Fluid,Province,沉淀,压力,含矿流体,沸腾作用,发生,地壳浅部,热流体,幔源岩浆,演化过程

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Abstract:

金厂金矿床是中国东部陆缘超大型热液金矿床之一,矿床主要由角砾型金矿体和铜金矿体构成.为研究2种矿体的成矿流体来源、演化之间的联系,对铜金矿体中石英等矿物的流体包裹体进行了岩相学、显微测温和单个包裹体气液相成分激光拉曼探针分析.研究表明:①流体包裹体类型有纯气相包裹体、气液两相(包括富气相)包裹体、含子矿物多相包裹体和纯液相包裹体;②均一温度变化范围在230~600℃(600℃)之间,其中,钾长石-石英-黄铁矿阶段、石英-黄铁矿阶段、石英-多金属硫化物阶段的温度分别为510~600℃、410~510℃、270~410℃;③盐度w(NaCleq)变化在2.57%~73.96%之间,可分为高温高盐度(35.99%~73.96%)、高温中高盐度(38.94%~57.09%)和高中温中低盐度(2.57%~19.05%)3类;④流体包裹体气相成分主要为H2O、CO2,少量N2、C4H6、H2;⑤多相流体包裹体中的子矿物有石盐、钾盐、石膏、重晶石和黄铜矿等.这些特征揭示成矿流体为高氧化岩浆热液(H2O-CO2-NaCl-SO2-4型).结合前人对角砾岩型金矿体(1号)的流体包裹体研究,初步确定成矿流体的演化过程为,来自幔源岩浆期后的热流体,上升到达地壳浅部发生隐爆、沸腾作用,形成低盐度和高盐度含矿流体后,伴随着温度和压力的降低,流体结晶沉淀,形成角砾岩型铜金矿体.

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