论文部分内容阅读
本文对570矿床成矿的地质特征进行了分析,结果表明,该矿床的形成受断裂构造及基底、盖层岩石的含铀性双重控制。稳定同位素特征揭示了矿质来说从围岩中淋取;成矿溶液主要来源于大气降水。包裹体的研究表明,成矿温度为150℃左右,属中低温热液矿床。铀在成矿溶液中以UO_2(CO_3) ̄(2_)_2形式迁移,当矿液途经容矿构造时,压力剧减、CO)2逸出、温度降低,还原性的物理化学条件,有利于UO_2的分解和的还原沉淀成矿。
In this paper, the geological characteristics of the metallogenic 570 ore deposit are analyzed. The results show that the formation of this deposit is controlled by the fracture structure and the uranium content of the basement and caprock. Stable isotopic characteristics reveal mineral leaching from surrounding rocks; ore-forming solutions are mainly derived from atmospheric precipitation. The study of the inclusions shows that the metallogenetic temperature is about 150 ℃ and belongs to the medium-low temperature hydrothermal deposit. Uranium migrates as UO_2 (CO_3) ~ (2_) _2 in the ore-forming solution. When the ore solution passes through the ore-hosting structure, the pressure drastically decreases and the CO 2 escapes, the temperature decreases and the physicochemical conditions of reduction are favorable UO_2 decomposition and reduction of sedimentary mineralization.