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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。
The copper deposits in the Lanping-Simao Mesozoic-Cenozoic basin were mainly produced in salt-rich red clastic rocks composed of sandstone, siltstone and shale. The isotopic composition of the deposit shows that the ore-forming solution is mainly derived from the atmospheric precipitation, the mineralization and alteration are carried out in a system with low water / rock ratio, the lead comes from the mixture of sedimentary and basement rocks, Carbon and silicon have a multi-sourced character. The geological characteristics and isotopic compositions of the deposits show that the studied copper deposits are significantly different from the typical sandstone-type copper deposits and similar to the mineralization in some geothermal areas. It shows that the copper deposits in the sand shale area of the study area have a special metallogenic mechanism, that is, the industrial deposit is formed by the continental jet flow after the initial mineral accumulation undergoing diagenesis.