华南铀成矿省花岗岩型铀矿矿质卸载机制研究

Study on Mineral Discharge Mechanism of Granite Type Uranium Deposits in South China Uranium Metallogenic Province

花岗岩型铀矿是华南铀成矿省最重要的铀矿类型,但以往花岗岩型铀矿成矿作用过程中矿质卸载机制研究较为薄弱。在阐述华南花岗岩型铀矿成矿区域地质背景、产铀花岗岩特征及铀矿时空分布特征的基础上,总结了不同类型铀矿床的赋存部位及矿体空间分布特征,认为成矿流体温压快速降低、成矿流体的湍流运动、还原作用和新物质(矿化剂)的加入是华南花岗岩型铀矿矿质卸载的重要机制,不同类型铀矿床有其主要的矿质卸载机制,但不是唯一的,矿床的形成可以存在多种矿质卸载机制。通过对产铀岩体可能的卸载空间分析,结合矿质卸载机制研究,有利于拓展勘查空间及找矿部署。

Although granite-type uranium deposit is the most important one in south China uranium met- allogenic province, study on the mineral discharge of uranium metallogenisiswas relatively weak. By studying the regional geological background of uranium metallogenisis, characteristics of uranium-bearing granite, spatial and temporal distribution characteristics of granite type uranium deposit in the metallo- genic province, we summarized the deposit arrangement and ore-body spatial distribution characteristics of different uranium deposits, and found that the rapid descent of. temperature, pressure and turbulent velocity of mineralization solution, the reduction and addition of new materials （mineralizers） are the im- portant factors to control the mineral discharge mechanism for the formation of granite type uranium de- posits in south China. Different types uranium deposits have their main mineral discharge mechanism but not the only one, there may be many mineral discharge mechanisms in the formation of uranium deposits. It is helpful to analyze the possible discharge space and study the mineral discharge mechanism of urani- um-bearing granite in expanding prospect space and deploy further exploration.