512—1铀矿床矿化特征及其成因探讨

512-1铀矿床位于白依背斜北翼志留系下统中,含矿岩层为碳质泥质板岩所夹的硅灰岩透镜体。区内岩浆岩不发育。铀矿体受地层、岩性、东西向走向断层和北东向切层断裂破碎带控制,呈透镜状,以边幕式斜列产出。合矿岩石主要为破碎或碎裂的硅质灰岩、硅岩。铀赋存形式以吸附状态为主,有少量的沥青铀矿、铀黑和铀的次生矿物。铀通过同生富集,后生再造等多期地质作用富集成工业矿体。

DISCUSSION ON MINERALIZATION CHARACTERISTICS AND ORIGIN OF THE URANIUM DEPOSIT No. 512-1

The uranium deposit is located in the Lower Silurian on the northflank of the Baiyi Anticline. The ore-bearing horizon consists ofsilicalite-limestone lenses intercalated with carbonaceous-argillaceousslate. Magmatic rocks are not developed in this area. Uranium orebodiesare controlled by strata, lithologies, EW-trending fault and NE strike-cutting fracture zone, occurring as en echelon lenses. Host rocks are mainlycomposed of fractured and cataclastic siliceous limestone and silicalite.Uranium exists mainly in the form of adsorption with minor amounts ofpitchblende, uranium black and secondary uranium minerals. Uranium wasconcentrated as economically important orebodies by multiple-stage geologicprocess such as syngenetic concentration and epigenetic reworking.