广西大厂锡矿长坡—铜坑矿区赋矿硅质岩研究  

A research on ore-bearing silica rocks in Changpo-Tongkeng mining area of Dachang Sn deposit in Guangxi

作　　者：刘陈明[1] 秦德先[2] 杨德敏[2] 

机构地区：[1]云南国土资源职业学院,云南昆明650093 [2]昆明理工大学矿产地质研究所,云南昆明650093

出　　处：《矿产与地质》2014年第3期321-329,共9页Mineral Resources and Geology

摘　　要：通过对大厂锡矿长坡―铜坑矿区主要赋矿层位硅质岩岩石学、岩石化学的研究,认为矿床赋矿硅质岩以及其中各类纹层、条带状含电气石、长石及硫化物的沉积物是海底热液循环系统中喷出海底的热水溶液以化学沉积方式形成的,生物可能参与了部分硅质岩的形成;另外,在某些热水沉积作用减弱时期,可能有少量陆源碎屑物质的加入,形成了硅质岩建造中少量绢云母泥质纹层条带;并且得出形成硅质岩的硅质来源,主要来自海底热卤水循环系统,部分来自海底中基性火山岩海解或脱玻的产物,硅质岩的形成同大厂锡矿床的形成在成因上有着一致性关系。Based on the research of petrology and petrochemistry of the primary ore-bearing stratigraphic posi-tion in Changpo-Tongkeng mining area of Dachang Sn deposit,the author believes that ore-bearing silica rocks and the various laminar or banded sediments which contain tourmaline,feldspar and sulphides are formed by submarine hydrothermal solution erupted from submarine hydrothermal circulation system by means of chemogenic deposit,and organism may be involved in the formation of part of silica rocks.Besides, when hydrothermal sedimentation partially weakens,a small amount of detrital material of terrigenous origin may be involved to form a small amount of sericite and muddy lamellar strip in the building process of silica rocks.It is concluded that the siliceous source of silica rocks is mainly from the submarine hot brine circula-tion system,and is partially from the halmyrolitic or devitrified products of the submarine intermediate-basic volcanic rocks.The genesis of silica rocks is consistent with that of Dachang Sn deposit.

关 键 词：热水沉积岩 硅质岩 大厂 锡矿床 

分 类 号：P588.2[天文地球—岩石学]