上升热液浸取成矿过程中铀的迁移沉淀机制探讨——以希望铀矿床为例  

MECHANISM OF THE MIGRATION AND DEPOSITION OF URANIUM IN ASCENDING HYDROTHERMAL SOLUTIONS——EVIDENCE FROM THE XIWANG URANIUM DEPOSIT

作　　者：胡瑞忠[1] 金景福[2] 

机构地区：[1]中国科学院地球化学研究所 [2]成都地质学院

出　　处：《地质论评》1990年第4期317-325,共9页Geological Review

摘　　要：本文主要根据热力学的理论和方法,以希望铀矿床为例探讨了上升热液浸取成矿过程中铀的迁移沉淀机制。研究表明,虽然热液在上升过程中的氧化性逐渐增强,但是,铀源体中的四价铀在深部相对还原性热液作用下的氧化迁移(浸取)以及热液中的六价铀在浅部相对氧化性条件下的还原沉淀(成矿)都是可能的。这主要取决于热液演化过程中∑CO_2的动态以及受其制约的热液中六价铀的存在形式。According to the theories and methods of thermodynamics, this paper focusses on the mechanism of migration and deposition of uranium in ascending hydrothermal solutions, taking the Xiwang uranium deposit for example. The studies show that it is highly possible that tetravalent uranium in uranium-source bodies may be oxidized and migrate at relatively reducing conditions at depth and, on the other hand, that hexavalent uranium in hydrothermal solutions can be reduced and deposited at relatively oxidizing conditions at shallow depth, which depends mainly on the mode of occurrence of hexavalent uranium in the solution controlled by the behaviors of ∑CO_2 in the evolution of the hydrothermal solutions.

关 键 词：热液 成矿 铀矿 铀 迁移 沉淀 

分 类 号：P619.140.5[天文地球—矿床学]