本文選題：自然銅 + 杏仁狀玄武巖�。� 參考：《礦物學(xué)報(bào)》2017年06期

【摘要】：峨眉山玄武巖銅礦與基韋諾超大型銅礦相似,杏仁狀玄武巖中的自然銅礦石就是該類(lèi)型銅礦床中的主要組成部分之一,本文稱(chēng)其為"杏仁體式"自然銅礦床。通過(guò)礦石礦物標(biāo)型特征、礦物組合特征以及固溶體分離結(jié)構(gòu)特征等分析研究,認(rèn)為川南滇北"杏仁體式"自然銅礦為火山熱液礦床,形成于低溫還原環(huán)境,成礦作用發(fā)生在巖漿作用結(jié)束期及間歇期熱液階段,成礦經(jīng)歷過(guò)熱液蝕變改造。銅礦物生成順序?yàn)?自然銅→斑銅礦、輝銅礦、黃銅礦→赤銅礦、黑銅礦、孔雀石等。玄武巖中廣泛分布的瀝青與自然銅同時(shí)形成,并為自然銅及銅的硫化物的形成提供了強(qiáng)還原環(huán)境。瀝青形成溫度和斑銅礦-輝銅礦的固溶體分解溫度將自然銅形成溫度區(qū)間限定為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，

本文編號(hào)：1739998