华南中新生代构造-岩浆活动驱动机制与铀成矿研究进展

Driving Mechanism of Structure-magmatic Activity and Uranium Mineralization of Mesozoic and Cenozoic,South China

华南地区大规模金属成矿作用主要发生在中生代,区内的铀成矿作用明显不同于其它金属的成矿作用,如成矿时代上从中生代延续到新生代、矿岩时差大、铀矿聚集分布、铀源及矿化剂具幔源性等。基于众多铀成矿理论,从构造-岩浆活动的驱动力与铀成矿的关系出发,系统总结华南中新生代构造-岩浆活动与铀成矿的关系,认为当前华南铀成矿的动力学观点有四个,即构造体制转换铀成矿观、热点(地幔柱)铀成矿观、幔汁活动铀成矿观、原地重熔铀成矿观。

Large-scale mineralization in South China mainly occurs in Mesozoic. However, uranium mineralization in this area lasts from Mesozoic to Cenozoic with the features as follows ： （ Ⅰ ） the time gap of diagenesis and ura nium mineralization is large; （ Ⅱ ） the large uranium deposits are aggregated distribution; （Ⅲ）the uranium source and the mineralizer is mantle-derived; （IV） the uranium exploration has no great breakthrough for a long time. This paper takes the relation between the driving force of strueture-magmatic activity and uranium minerali zation as a starting point, combines with many uranium mineralization theories and studies the relation between structure-magmatic activity and uranium mineralization in South China systematically in Mesozoic and Cenozoic. According to the study, the relation between structure-magmatic activity and uranium mineralization in Mesozoic and Cenozoic of South China can be divided into four categories ： Tectonic regime transformation uranium minerali zation view, Hot spot （mantle plume） uranium mineralization view, Mantle ichor activity uranium mineralization view and ln-situ melting uranium mineralization view.