中文摘要：

302铀矿床规模大，垂幅深（达1000多米），是我国华南主要产铀花岗岩型铀矿床之一。研究表明该矿床的方解石是经大气降水与围岩发生水岩反应后的流体去气沉淀的；矿化剂∑CO2主要源自受控于岩石圈伸展导致的地幔去气，对铀成矿的作用一方面表现为加入到贫矿化剂的地下水中以便铀元素迁移，另一方面表现在从成矿流体中逸出，改变热液络离子组成，导致铀沉淀成矿；印支碰撞运动使华南地壳叠加增厚，部分熔融含铀结晶基底，为产铀岩体提供丰富的成矿物质来源；白垩纪-古近纪地壳拉张、岩石圈伸展所形成的深大断裂等不仅是矿化剂∑CO2主要通道，而且还是控制铀矿床形成的关键因素。

英文摘要：

：The No. 302 uranium deposit is big in scale and the vertical interval of ore-bodies extends about 1000 m. Thus, it is one of the main U-producing granite-type uranium deposits in South China. The results indicated that calcites were precipitated during fluid degassing after water-rock interaction between meteoric water and the wall rocks. The mineralizer ∑ CO2 mainly originated from mantle degassing which was controlled by lithospheric extension. Ura- nium could be transported easily after CO2 found its way into groundwater which was free from ∑ CO2. On the other hand, the anionic complex composition of fluid was changed when COz escaped from the ore-forming fluid, thus, U could be precipitated easily. The Indosinian collision movement caused the lithosphere thickened, leading to the formation of a partially melted uranium-bearing crystal basement in South China, therefore, it provided abundant oreforming materials for U-producing granites. Deep-large faults which were formed during lithospheric extension in the Cretaceous-Paleogene period were not only the main channels of mineralizer ∑ CO2, but also the key factors which controlled uranium deposition.