相山铀矿田6122矿床凝灰岩铀矿石成因探讨

Discusson on the Origin of Tuff Uraniun Ore at 6122 Uranium Deposit of the Xiangshan Uranium Mineral Field

在相山铀矿田 612 2矿床 4号带的主要含矿岩石英安岩和“碎斑熔岩”之外发现了新的含矿岩石凝灰岩。铀矿石中绿泥石含量较高 ,并且含铀达 7.13 %。经过对含矿凝灰岩特征、矿化与构造的关系、与铀矿物共生矿物的特征进行研究 ,笔者认为成矿热液来自于地壳深部 ,曾经经历过高温阶段。在矿化蚀变过程中形成大量绿泥石、水云母等粘土矿物 ,它们使铀酰络离子稳定性、溶解度降低而解体 ,使铀还原沉淀并被绿泥石。

At 6122 Deposit fourth zone of the XiangShan Uranium Mineral Field, it is thought that the main rock contained ore are dacite and mortar-lava. But the authors find the uranium ore contained in tuff. By analyzing and studying, the chlorite in uranium ore contains much more the amount of uranium, the amount of uranium reaching to 7.13%. Through the contained ore tuff characters, the relationship of mineralization and structure and mineral characters intergrowth with uranium mineral studied, the authors think that the hydrothermal ore-forming solution come from the deep earth crust section and underwent the high temperature phase ever. The mass clay mineral such as chlorite and hydro-mica formatted at the process of mineralizing alteration reduce the stability and solubility of uranyl complexion, and decompose it, and then ,reduce and precipitate uranium. At last, uranium is absorbed by such as chlorite and hydro-mica.