摘要
近年被露采剥露的３７３铀矿床已确凿地显示出大型古岩溶成因地质特征：铀矿体沿古岩溶系统永久循环带的地下廊道排列，壮观的古溶洞沉积铀矿化，典型的成年期古岩溶地质剖面，矿石中铀基本呈淋积吸附状态存在等。笔者拟将该矿床划为古岩溶型矿床中的古岩溶矿床亚类，是我国迄今已发现铀矿床中唯一大型古岩溶铀矿床。
No.373 uranium deposit,on the south side of Guangxi Province,is a strata-bound oredeposit.The deposit has high-tonnage and high-grade orebodies and relatively shallow burieddepth.The ores occurred in filled sediments of paleokarst caves in limestone of the middleDevonian Donggangling Formation.It is in part similar to the occurrence of ore in some Mis-sissippi Valley-type base metal deposits.The ore bodies are distributed along undergroundpaleokarst corridor.The deposit has a typical paleokarstic profile:upper permeable zone,middle permanent circulation zone and lower general imbibition zone.Uranium in the ore oc-curs in the form of adsorption,a bit as micro-granules of pitchblende.Associated minerals arepyrite,sphalerite,ilsemannit,pitchblende,molybdine,Wulfenite,Uranophane,autunite,cal-cite,dolomite,quartz and clay mineral.The mineralization ages are 140-120 m.y.(early Cre-taceous)and 65m.y.(Paleogene).The deposit is refered to paleokarst uranium deposit ingenesis.
出处
《中国岩溶》
CAS
CSCD
北大核心
1995年第4期289-294,共6页
Carsologica Sinica
基金
国家教委博士点科研基金
中国科学院矿床地球化学开放研究实验室基金资助项目
关键词
铀矿床
古岩溶
地质特征
淋积吸附
uranium deposit
paleokarst
geological feature
leaching-accumutive ad-sorption.
