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地球学报  2004 

粤西河台金矿床富硫化物石英脉Rb-Sr等时线年龄讨论

Keywords: 河台金矿床,富硫化物石英脉,Rb-Sr等时线年龄

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Abstract:

河台金矿床产于河台韧性剪切带中,成矿作用分为韧性剪切变质成矿期的韧性剪切变质成矿阶段和热液蚀变成矿期金石英脉阶段、金硫化物阶段和方铅矿闪锌矿碳酸盐脉阶段。金的成矿主要发生在金石英脉阶段和金硫化物阶段,形成的矿石有蚀变糜棱岩型和富硫化物石英脉型。富硫化物石英脉单矿物石英中富含以富CO2液相为主的流体包裹体、流体熔融包裹体及熔融包裹体。与以往用流体包裹体热爆法和压碎法提取Rb、Sr的方法不同,本文用石英全溶法测得富硫化物石英脉中石英的RbSr等时线年龄为172±2Ma(1σ),初始比值为0.72816±0.00096,对比已有的同位素年龄数据及区域成矿特征,认为这一年龄值可能代表了河台金矿床的成矿年龄。

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