论文部分内容阅读
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。
302 uranium deposit is large in size and deep in depth (more than 1000 meters). It is one of the major uranium granite-type uranium deposits in southern China. The study shows that the calcite in this deposit is precipitated by fluid dewatering after rock and water reaction with the surrounding rock. The mineralized agent ΣCO2 mainly comes from the goaf that is controlled by the extension of the lithosphere, On the one hand, it is added to the lean mineralizer groundwater to facilitate the migration of uranium, on the other hand, it escapes from the ore-forming fluids and changes the hydrothermal complex ion composition, resulting in uranium precipitation and mineralization. The crust of South China is thickened and partially melted with uranium-bearing crystalline basement, which provides a rich source of ore-forming materials for the uranium-bearing rock mass. The Cretaceous-Paleogene crustal extension and the deep faults formed by lithospheric extension are not only mineralized Agent ΣCO2 main channel, but also control the formation of uranium deposit key factors.