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该铀矿床位于我国西南。本文的目的是,通过矿物包裹体研究,进一步查明该铀矿的成矿物理化学条件并探讨矿床成因。加里东晚期,志留系形成含铀地层,它是本铀矿的矿源层。燕山期和喜山期,在地表水和地下水作用下,矿源层中铀被迁移而后富集成矿。主要成矿阶段的温度为166～195℃,压力是100—200巴。成矿溶液的pH=6.5～6.8,盐度为5.6～16.7％。矿物包裹体氢,氧同位素结果,δD=-4.75～-8.99‰(SMOW),δ~(18)O_(H2O)=3.14～7.11‰(SMOW),说明成矿溶液为被加热的大气降水。本铀矿床属低温浅成地下热水型矿床。
The uranium deposit is located in southwest China. The purpose of this paper is to further elucidate the mineralization physicochemical conditions of this uranium deposit and to explore the genesis of the deposit by studying mineral inclusions. Late Caledonian, Silurian formed uranium-bearing strata, which is the uranium ore source layer. During the Yanshan period and the Himalayan period, under the action of surface water and groundwater, the uranium in the source bed was migrated and then enriched in mineralization. The main mineralization temperature is 166 ~ 195 ℃, the pressure is 100-200 bar. The pH of ore-forming solution is 6.5 ~ 6.8, and the salinity is 5.6 ~ 16.7%. The results of δ18 = -4.75 ~ -8.99 ‰ (SMOW) and δ ~ (18) O_ (H2O) = 3.14 ~ 7.11 ‰ (SMOW) show that the ore-forming solution is heated by atmospheric precipitation. The uranium deposit belongs to low-temperature epithermal underground water deposit.