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矿床地质  2000 

兰坪-思茅盆地砂页岩中铜矿床同位素地球化学

Keywords: 砂页岩,铜矿床,同位素,地球化学,兰坪,思茅盆地,云南

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Abstract:

兰坪思茅中新生代盆地中的铜矿床,主要产于由砂岩、粉砂岩和页岩组成的含盐红色碎屑岩建造中。对矿床的同位素组成研究表明:成矿溶液主要来自大气降水,矿化和蚀变作用是在水/岩比值较低的体系中进行的:铅来自赋矿的沉积岩与基底岩石的混合;硫、碳和硅则具有多来源的特性。矿床地质特征和同位素组成特点表明,所研究的铜矿床与典型砂页岩型铜矿床存在显著差异,而与一些地热区的矿化作用相似。说明研究区砂页岩中的铜矿床具有特殊的成矿机理,即在经历了沉积成岩作用发生矿质初步聚集后又通过陆相喷流作用而形成工业矿床的。

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