华南赣杭构造带火山岩型铀矿成矿规律与成矿作用研究进展

Advanceson Metallogenesis of Volcanic-type Uranium Deposits in Gan-Hang Tectonic Belt,Southeast China

华南赣杭构造带是典型的火山岩型铀矿床成矿带,其铀矿成矿时代、控矿规律及热液蚀变等方面有一定的共同特征。铀成矿流体主要为深源高温、高压、中高盐度、富含挥发分的还原性流体,晚期有大气降水加入,富铀基底和富集地幔可能共同提供了成矿物质,成矿期铀可能主要以正四价杂化配合物形式运移。矿床的形成是中生代大陆热点作用晚期的产物。

The Gan-Hang tectonic belt is a typical volcanic-type uranium mineralization belt. There arecertain extent common features in mineralization ages, ore-controlled characteristics, mineral association and hydrothermal alteration for the uranium deposits in this region. The min-eralization fluids are chartered by high temperature, high pressure, middle-high salinity, volatile-bearing and deoxidize and influxing of circulated meteoric water in later stage. The ore-forming mattersare sourced fromuranium-enriched basement and enriched mantle, and the uranium was mainlymigrated astheuranous hybrid complexes in metallogenic stage. The formation of uranium deposits is closely associated with Mesozoic continental hot spots.