华南碳酸盐岩型铀矿床中有机质及其与铀成矿的关系

华南碳酸盐岩铀矿床,分布广泛,产于泥盒—二叠纪的各地层中。矿床受岩相、构造、水文地球化学等多种条件控制。矿化与有机质关系密切,而有机质的分布受泻湖相带控制。经研究对比,与成矿有关的有机质属于腐泥型,来源于海相微体生物和藻类。铀在各地层中的含量不均匀,富里酸和腐殖酸是含铀的主要有机质。

Organic Matter Andits Relation With Uranium Mineralization In Carbonate-Type Uranium Deposits In South China

Carbonate-type uranium deposits, widely distributed in south China, occur in lots of sequences of the Devonian-Permian strata, and are controlled combinedly by such factors as lithologic facies, faults, fissures and hydrogeochemical conditions. The mineralization is in close relation with organic matter which, in turn, is governed by lagoonal facies zone. This paper points out that the organic matter is of sapropel type. In the ores 21-64 per cent, of uranium is directly related to organic matter, mainly humic acid and fulvic acid, and the remaining part also has something to do with these acids in space. This shows that the organic matter of sapropel type likewise played an important role in Uranium mineralization. The process took place in both early sedimentary- diagenetic stage and eigenetic stage.