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矿床地质  2002 

新疆京希-伊尔曼德金矿床矿化类型热液蚀变及流体包裹体证据

Keywords: 矿化类型,热液蚀变,高硫化,流体包裹体,新疆

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Abstract:

京希-伊尔曼德金矿床位于新疆伊宁县北部。金矿(化)体赋存于下石炭统大哈拉军山组下部粗碎屑岩中同时受控于断裂构造和岩眭。该矿床形成于浅成低温环境的高硫化体系中。初始强酸胜的含金热液流体在沿断裂构造向上迁移时,与围岩发生水-岩反应形成由内向外的物理化学梯度变化,表现为以硅化(发育酸胜淋滤形成的多孔状石英构造)、高级泥化和泥化构成蚀变分带。迪开石+高岭石+多孔状.硅化石英等热液蚀变矿物构成高级泥化主蚀变。金主要沉淀富集于硅化带和高级泥化带。蚀变矿物组合及流体包裹体资料确定的成矿流体胜质为:酸眭(pH早期为2~3,晚期为3~5)、低盐度[w(NaCI)eq<5%]及低温(成矿温度为180~270℃)。

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