衡阳盆地西缘卧龙岗铀矿床成矿地质特征

Metallogenic Geological Characteristics of the Wolonggang Uranium Deposit in the Western Margin of the Hengyang Basin

卧龙岗铀矿床位于衡阳盆地西缘关帝庙岩体南侧外接触带,是衡阳地区少有的花岗岩外接触带亚类型铀矿床。放射性物探测量显示,区内寒武系香楠组是主要富铀和含铀层。该矿床为中低温热液成因,发育硅化破碎带型和脉体充填型两种铀矿化。矿床赋矿围岩为香楠组地层,矿体多呈脉状、网脉状、透镜状。云煌岩脉为铀成矿提供一定热源、还原性挥发分,是重要控矿岩脉。以往勘查成果显示,矿区成矿地质条件良好且铀矿勘查前景巨大。

The Wolonggang uranium deposit is located in the Southern contact zone of the Guandimiao plu-ton in the western margin of the Hengyang basin. It is a rare perigranitic subtype uranium deposit in the Hengyang area. The radiogeophysical survey shows that the Cambrian Xiangnan formation in the area is the main uranium-rich and uranium-bearing stratum. The deposit is of medium-low temperature hydrothermal origin and is characterized by two subtypes of uranium mineralization: silicified fracture type and vein type. The host-rock of the deposit is the Xiangnan formation, and the ore bodies are mostly vein shaped and lenticular. The host-rock is Xiangnan formation, and the ore bodies mostly occur as veins, network veins, and lenticulars. The minette vein is an important ore-controlling vein, which provides certain heat-source and reduces volatiles for uranium mineralization. Previous exploration results show that the mine area has good geological conditions for mineralization and great prospects for uranium exploration.