川南滇北含自然铜杏仁状玄武岩的矿物组合与成因

发布时间：2018-04-12 13:45

  本文选题：自然铜 + 杏仁状玄武岩　； 参考：《矿物学报》2017年06期

【摘要】：峨眉山玄武岩铜矿与基韦诺超大型铜矿相似,杏仁状玄武岩中的自然铜矿石就是该类型铜矿床中的主要组成部分之一,本文称其为"杏仁体式"自然铜矿床。通过矿石矿物标型特征、矿物组合特征以及固溶体分离结构特征等分析研究,认为川南滇北"杏仁体式"自然铜矿为火山热液矿床,形成于低温还原环境,成矿作用发生在岩浆作用结束期及间歇期热液阶段,成矿经历过热液蚀变改造。铜矿物生成顺序为:自然铜→斑铜矿、辉铜矿、黄铜矿→赤铜矿、黑铜矿、孔雀石等。玄武岩中广泛分布的沥青与自然铜同时形成,并为自然铜及铜的硫化物的形成提供了强还原环境。沥青形成温度和斑铜矿-辉铜矿的固溶体分解温度将自然铜形成温度区间限定为290~225℃。
[Abstract]:Emeishan basalt copper deposit is similar to that of Jiveno superlarge copper deposit. The natural copper ore in almond basalt is one of the main components of this type of copper deposit, which is called "almond type" natural copper deposit in this paper.Based on the analysis of mineral typomorphic characteristics, mineral assemblage characteristics and separation structure of solid solution, it is considered that the "almond type" natural copper deposit in the north and south of Sichuan is a volcanic hydrothermal deposit formed in a low temperature reduction environment.The mineralization took place at the end of magmatism and the intermission hydrothermal stage, and the ore-forming went through the alteration of superheated fluid.The order of copper mineral formation is: natural copper chalcocite chalcopyrite chalcopyrite chalcopyrite malachite and so on.Bitumen, which is widely distributed in basalt, is formed simultaneously with natural copper, which provides a strong reduction environment for the formation of natural copper and copper sulphide.The formation temperature of bitumen and the solid solution decomposition temperature of copper-chalcopyrite are limited to 290 ~ 225 鈩，

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