川滇黔地区与峨眉山玄武岩有关的自然铜矿床成因实验研究  

An Experimental Study on Genesis of Emeishan Basalt-Related Native Copper Deposit in the Sichuan-Yunnan-Guizhou Area

作　　者：王富东[1,2] 朱笑青[1] 韩涛[1,2] 王中刚[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550002 [2]中国科学院研究生院,北京100049

出　　处：《矿物学报》2011年第3期322-327,共6页Acta Mineralogica Sinica

基　　金：国家重点基础研究发展规划项目"华南陆块陆内成矿作用:背景与过程"(973)(编号:2007CB411401);矿床地球化学国家重点实验室专项经费以及国家自然科学基金项目(编号:40773035)

摘　　要：在室温和pH值为中性的开放体系下,选用川滇黔地区与峨眉山玄武岩自然铜矿床相关的不同类型矿物,对配制的铜胶体溶液和Cu2+溶液进行吸附试验,结果表明,矿物对铜胶体和Cu2+的吸附率从高到低分别为硫化物、有机质(沥青)、粘土矿物、硅酸盐矿物。这一实验结果与川滇黔地区自然铜矿的赋矿围岩为玄武质角砾岩、铝土-粘土质沉积岩,自然铜与有机质伴生等地质现象一致,并表明有机质在自然铜成矿作用中不仅提供了还原条件,而且是很好的吸附剂。文章还探讨了与峨眉山玄武岩有关的自然铜矿床中铜的迁移形式:认为铜不仅能以离子或络合物的形式迁移,还可能以纳米粒级单质铜的形式迁移。This study selected deferent minerals from Emeishan basah-related native Cu deposits in the Sichuan-Yun- nan-Guizhou area for colloid Cu and Cu2＋ solution adsorption investigations under room temperature and neutral pH conditions. Adsorption rate of colloid Cu and Cu2 ~ solution by different minerals decreases according the order of sul- fides, organic matters （bitumen） , clay minerals and silicates. The adsorption result is consistent with the fact that n- ative Cu in the Sichuan-Yunan-Guizhou area is mostly hosted in basaltic breecias and aluminous-clayey sedimentary rocks. Native Cu is generally associated with organic matters, which are ideal adsorbent, indicating reducing condi- tions during ore forming stage. This study also discussed Cu migrating ways in the Emeishan basalt-related Cu depos- its. Cu can migrate not only in forms of ions or complexes, but also in nanometer-level simple substances.

关 键 词：峨眉山玄武岩 自然铜 纳米 矿床成因 吸附实验 

分 类 号：P579[天文地球—矿物学] P599[天文地球—地质学]