横涧—岗上英矿床多期次热液活动与铀成矿关系的探讨

Discussion on relationship between uranium metallogenesis and multiperiodic hydrothermal activities in Hengjian～Gangshangying Deposit

分析了火山盆地基底变质岩在区域变质、构造变形以及深熔岩浆的分异、演化过程中铀的迁移、富集规律,指出基底的富铀建造所形成的深熔岩浆充分分异演化释放的铀是相山矿田的主要铀源,通过分析横涧—岗上英矿床成矿热液各阶段蚀变矿物组合,探讨成矿热液组分的演化过程,认为该矿床属中、低温热液铀矿床。

Migration and enrichment of uranium in the basement metamorphic rock of Xiangshang volcanic basin during the regional metamorphism, tectonic deformation, differentiation and evolution of the anatectic magmas are analyzed. It is pointed out that uranium which is liberated by the complete differentiation and evolution of the anatectic magmas formed by the uranium enriched formation in the basement is the major uranium sources of Xiangshan ore-field. By analyzing the altered mineral assemblages in different stages of ore-forming hydrothermal activity in Hengjian-Gangshangying Deposit, evolutionary processes of metallogenic hydrthermal compositions are discussed. It is considered that this deposit belongs to middle to low temperature hydrothermal uranium deposit.