赣东北地区铀矿地球化学成矿规律研究

Study on geochemical metallogenic regularity of uranium deposits in northeast Jiangxi

赣东北地区火山岩型铀矿床(点)分布广泛,区内不同地段地球化学元素组合分布特征各不相同,本文通过对赣东北地区不同地段铀矿成矿地球化学类型总结归纳,将区内的矿化元素组合划分为六种基本类型。以此为基础,得出赣东北地区矿化元素组合空间分布规律是以东乡-广丰深断裂北部主干断裂为界,以南主要发育一套内生成矿作用的矿化元素组合特征,以北主要发育一套外生成矿作用的矿化元素组合特征,且矿化元素组合明显存在着“纵向分段、横向和垂向分带”规律。在区域上铀矿床(田、带)定位于成矿系列和矿化系列的特定位置上;区段上铀矿床(区)定位于矿化元素组合空间分带规律;局部空间上,铀矿床(体)定位于指示元素空间分带规律的一定位置上。

Volcanic type uranium deposits(points)are widely distributed in northeast Jiangxi,and geochemical element assemblages in different sections are different in this area.In this paper,the mineralization element assemblages in this area are divided into six basic types through the study of uranium metallogenic geochemical types in different sections in northeast Jiangxi.Based on these results,it is concluded that the spatial distribution of mineralized element assemblage in northeast Jiangxi is bound by the main fault in the north of Dongxiang-Guangfeng deep fault.A set of mineralized element assemblage features of endogenous mineralization are mainly developed in the south,and that of exogenous mineralization are mainly developed in the north.The mineralized element assemblage obviously has the rule of“longitudinal segment,horizontal and vertical zoning”.In the region,uranium deposits(fields,belts)are located in the specific position of metallogenic series and mineralization series.The uranium deposits(areas)in the upper section are located in the zoning law of mineralized element assemblage space.Locally,the uranium deposit(body)is located at a certain position indicating the spatial zoning regularity of elements.