高校地质学报2017，Vol.23Issue(2)：202-212,11.DOI:10.16108/j.issn1006-7493.2016222
纳米比亚欢乐谷地区白岗岩型铀矿成矿机理剖析
Discussion on Mineralization Mechanism of Leucogranite-type Uranium Deposit in Gaudeanmus Area, Namibia
摘要
Abstract
This paper presents a systematic study of uranium mineralogy,metallogenic epoch,ore-controlling factors,ore-forming material sources,and mineralization mechanism of leucogranite-type uranium deposit in Gaudeanmus area,Namibia.The results show that the formation of this deposit was controlled by multiple factors including structure,lithology,stratum,mafic veins or dykes,and late hydrothermal superimposition.The ore bodies mainly occur in the hinge of folds,margins of domes and various positions of structures (twisted or expanded portion),which provide abundant space for uranium mineralization.At the same time,the Welwitschia regional faults are the conduits for uranium transport.Mineralized leucogranite has metallogenetic specialization suggesting that D,E-type leucogranites were mineralized and other four types of leucogranite and Salem-type granite were not mineralized.Besides,mineralized leucogranite occurs as veins intruded into Karibib Formation and Kuiseb Formation.The late hydrothermal superimposition occurs in fractures making mineralized leucogranite strongly altered and apparently increasing ore grade.This stage of uranium mineralization is closely related to the intrusion of Jurassic mafic magma.The U-rich pre-Damara basement dominantly contributed to the ore-forming material during the main mineralization epoch,whereas the additional uranium infilling at the hydrothermal superimposition-reformation epoch possibly came from the primary uranium minerals themselves.Finally,a four-stage three-epoch "four dimensional" metallogenic model was constructed.关键词
成矿机理/成矿模式/控矿因素/白岗岩型铀矿/纳米比亚欢乐谷地区Key words
mineralization mechanism/metallogenic model/ore-controlling factors/leucogranite-type uranium deposit/Gaudeanmus area, Namibia分类
天文与地球科学引用本文复制引用
陈金勇,范洪海,王生云,顾大钊..纳米比亚欢乐谷地区白岗岩型铀矿成矿机理剖析[J].高校地质学报,2017,23(2):202-212,11.基金项目
非洲中南部古老地块铀矿综合识别评价技术及应用研究项目 （）
