诸广—贵东大型铀矿聚集区富铀矿成矿地质条件

The Geological Setting for the Formation of Rich Uranium Ores in Zhuguang-Guidong Large-scale Uranium Metallogenetic Area

位于南岭中部的诸广—贵东地区是中国花岗岩型铀矿最为重要的大型矿聚集区,已发现数个花岗岩型铀矿田,发育有数十个铀矿床,它们主要集中分布在诸广岩体南部和贵东岩体东部。区内富铀矿的形成与富铀古陆块、深部构造环境、幔涌区强烈深源岩浆活动、挤压向拉伸转变的构造环境、富铀沉积建造及富铀岩体、多期次热液蚀变叠加、高低差异的放射性元素迁移、良好的还原条件和封闭环境等区域地质背景和条件有着十分密切的关系。富铀矿在诸广、贵东两岩体内的集中分布和一系列有利于铀成矿的良好地质背景表明,该区乃至整个南岭范围地质背景相似的地区是铀成矿的有利地区,仍存在着寻找隐伏富大铀矿的巨大潜力。

Zhuguang-Guidong area, located in the middle part of Nanling, the bordering region of Hunan, Guangdong, Jiangxi and Guangxi Provinces, is the most important large-uranium-ore-concentrated area of granite type in China. Dozens of granite type uranium deposits have been proved in this area, especially in the Southern Part of Zhuguang Rock Mass and the Eastern Part of Guidong Rock Mass. The formation of rich uranium ore deposits in this area is closely related with the very favourable geological setting which includes the uranium-rich old landmass, deep-seated structures, intensive abyssal magamatic activities, tectonic settings of extension transformed from compression, uranium-rich sedimentary formations and rock masses, superimposed multi-stage hydrothermal alterations, radioactive element migrations, and the favourable reducing and closed geological environments. The relatively clustered distribution of uranium deposits in Zhuguang and Guidong rock masses and the very favorable geological setting for uranium mineralizations suggest that the Zhuguang-Guidong area and probably some other areas having similar geological settings in the whole Nanling region are the target area for rich and giant blind ore deposits.