尼日尔阿泽里克铀矿床铀的赋存状态

Existing Form of Uranium in Azelik Uranium Deposit,Niger

笔者采用电子探针研究尼日尔阿泽里克铀矿床的矿石矿物,确认铀主要以铀矿物形式存在,并将其划分为两大种类,即沥青铀矿和铀石;共生矿物为黄铁矿、黄铜矿、辉铜矿、自然铜。当原生矿物遭受氧化后,次生铀矿物与铁、铜氧化物共生。根据铀矿物与共生矿物的关系,划分了成矿期次。

Electronic probe microanalyser was adopted to study ore minerals in Azelik uranium depos-it. Uranium were confirmed to occurs mainly as individual mineral which can be classified into two clas- ses： pitchblende and coffinite and the associated minerals of pyrite, ehaleopyrite, chaleocite, native copper. Secondary uranium minerals will occurred with iron and copper oxide when primary uranium min- erals are oxidized. On the base of paragenetic relationship of uranium minerals and associated minerals, the metallogenic epochs were divided for the deposit.