四川宁南银厂沟铅锌矿田硅质岩成因  

Origin of chert of Yinchanggou Pb-Zn ore field in Ningnan County,Sichuan Province

作　　者：黎应书[1] 李波[1] 祡大博 贺磊[1] 

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093

出　　处：《有色金属（矿山部分）》2017年第6期25-29,共5页NONFERROUS METALS(Mining Section）

基　　金：国家自然科学基金项目(41272111)

摘　　要：四川省宁南县银厂沟铅锌矿区的含矿层位上震旦统灯影组中含有大量的硅质条带,研究其地球化学特征不仅能够表明其成因,而且还能够反映矿床的成因类型。通过野外地质调研和室内岩石学、常量元素、微量元素以及稀土元素等的研究,表明该硅质岩主要由蛋白石、玉髓和石英组成,硅质岩的稀土元素总量为(1.36~88.9)×10-6,为轻稀土富集的右倾型。Fe/Ti在48.751~194.44,(Fe+Mn)/Ti在51.143~197.22,Al/(Al+Fe+Mn)在0.03~0.265,该硅质岩主要由喷流热水沉积作用形成。In Yinchanggou lead-zinc mining area of Ningnan county in Sichuan province,there are many cherts in Dengying formation of upper Sinian series.Research on geochemical characteristics of the cherts not only indicates its origin,but also reflects the genetic type of the deposit.By means of research on geological survey on field,petrology,major elements,trace elements and rare earth elements of the siliceous rocks,it＇s proved that the siliceous rocks are chiefly composed of opal,jade and quartz,total amount of rare earth elements of the cherts for（1.36~88.9）×10^-6,which is the light rare earth enrichment.Fe/Ti is between 48.751 and 194.44,（Fe＋Mn）/Ti is between 51.143 and 197.22,Al/（Al＋Fe＋ Mn）is between 0.03 and 0.265,the cherts is mainly formed by hydrothermal sedimentation.

关 键 词：硅质岩 热水沉积 成因 四川省宁南县银厂沟 

分 类 号：TD15[矿业工程—矿山地质测量]