摘要
根据地球化学急变带控矿的分带性规律 ,在滇黔边界发现了新类型的铜矿化及工业矿体找矿线索。铜矿化一般赋存在二叠系峨眉山玄武岩组 ,二者之间难于识别 ,铜矿物以自然铜和黑铜矿为主 ,赋存于特定的熔结凝灰岩、火山凝灰角砾岩层位 ,形成作用与有机质有关 ,很可能形成一种新的铜矿工业类型。基于野外调研和室内岩矿鉴定 ,按铜矿化的矿物组合及赋存特点 ,初步划分为 :硅质沥青铜矿化 ;次生氧化、硫化物铜矿化 ;团块浸染状自然铜矿化 ;热液蚀变沸石化型黑铜矿化 ;凝灰角砾岩型黄铜矿化和碳质、硅化木铜矿化等 6种铜矿化类型。这些矿化类型分别与相应的玄武岩组韵律层相对应 ,其中 ,沥青质铜矿化类型在区域上分布广泛 ,沥青广泛充填于熔结凝灰岩的气孔和含矿凝灰岩、碳泥质岩石破碎带中 ,自然铜、黑铜矿等矿物赋存于硅质沥青岩中 ,矿化层稳定 ,找矿标志明显 ,具有重要的创新性研究意义和找矿价值。
According to the geochemical steep zonal patternof mineralization,the authors have found the clues in search for a new type ofcopper ore depositsin the border area between Yunnan and Guizhou provinces. The copper mineralization is constrained by the ancient volcanic vents of Permian basaltic eruption.Occurring in the strata of Emeishan basalt Formation,they are difficult to be reco-gnized.Copper ores are dominated by native copper and tenorite in certainspecific strata of ignimbrite and volcanic breccia tuffs. Copper mineralization isclosely related to siliceous bitumen rocks some 15 m in thickness and thus occurs in a reduction environment.A new type of copper ore deposits is very likely to be found.On the basis of field findings, mineral assemblages and modes of occurrence of ores,Copper mineralization has been divided into the following types:①Siliceous asphaltene copper mineralization;②Copper mineralization of secondary oxides and sulfides;③Massive disseminated native copper mineralization;④Hydrothermal zeolitized tenorite mineralization;⑤Tuffaceous breccia typechalcopyrite mineralization;⑥Carbon-siliceous chalcocite and native coppermineralization. Among these types of copper mineralization, the asphaltene copper mineralization is widely distributed in the border area between Yunnan and Guizhou provinces and generally occur in vesicles of ignimbrite and copper materials, which provide copper for mineralization. The copper mineralization is intimately related to reduction environments. Native copper and tenorite widely occur in siliceous bitumen rocks, controlled by specific ore-forming strata. The asphaltene type copper mineralization is of important significance in the innovative research and prospecting work.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2004年第5期503-508,共6页
Acta Geoscientica Sinica
基金
中国科学院知识创新工程重要方向项目 (编号 :KZCX3 SW 12 5 )
国家自然科学基金 (编号 :40 0 72 0 3 3 )
国家重点基础规划发展项目(编号 :G19990 43 2 13 )资助。
