某古岩溶铀矿床中铀,钼,铼的赋存状态

本文采用电子探针、透射电镜和化学物相法，查明某古岩溶铀矿床中铀主要呈显微和超显微状沥青铀矿、铀石，其次呈分散吸附状和铀酰（次生）矿物形态存在；钼主要呈蓝钼矿、钼钙矿、钼华、钼铅矿等氧化物，其次呈胶硫钼矿等形态存在；铼主要呈吸附状，其次可能在黄铁矿中呈二硫化物包裹体形态产出。最后讨论了该三个元素赋存状态与该铀矿床形成地球化学环境之间的关系。

A STUDY ON THE EXISTING FORMS OF URANIUM, MOLYBDENUM AND RHENIUM IN A PALEOKARST-HOSTED URANIUM DEPOSIT

The existing forms of uranium, molybdenum and rhenium in a paleokarstfhosted uranium deposit in South China, were studied using electron microprobe, transmission electron microscope and selective solution analyses of chemical facies. It is shown that uranium in the ores exists mainly as ultra-micrograins of pltchblende and coffinite, and secondly as being adsorbed on organic matter and clays. Molybdenum in the ores exlsts mainly as oxides, such as ilsemannite, wulfenite and molybdine, and minor amounts of Mo occur as jordisite. Most of the rhenium in the ores was adsorbed on organic matter and clays and minor may occur as ReS2 in pyrite. This mineral assemblage is attributed to the genesis of the uranium deposit, which was formed in a paleokarst system and is of epigenesis.