世界核地质科学2023，Vol.40Issue(4)：889-907,19.DOI:10.3969/j.issn.1672-0636.2023.04.002
纳米比亚白岗岩型铀成矿作用评述
A Review of the Mineralization of Leucogranite-Type Uranium Deposit in Namibia
摘要
Abstract
Namibia is very rich in uranium resources,known as the"strategic metal reserve",among which the leucogranite-type uranium deposit is one of the most important uranium deposits,with huge metallogenic potentiality,mainly controlled by structure,lithology and stratum,some deposits also exist late hydrothermal superimposition enrichment.Metalization are of lithological specialization which means only type D,type E leucogranite are mineralized and the other four types of leucogranite and Salem-type granite are barren as a result of the differences of formation age.Type D,type E leucogranite are U-rich because they formed after D3 deformation associated with the partial melting of uranium rich baserock,while the other types formed before the D3 formation without the participation of uranium baserock melting.The ore bodies mainly occur in ductile shear zone with predominant direction of NNE,corner of fold,margin of dome and structural variation position(twist or expand),which provide abundant space for uranium mineralization.At the same time,Welwitschia regional faults act as the transportation way of uranium.In terms of strata,mineralized leucogranite presented as veins and network veins intruded into Rossing formation,Khan formation,Chuos formation,Karibib formation(with respect to the loss or reduction of Rossing formation).The decarbonization reaction between marble and magma resulted from the creasing of the contents of CO2 in the ore forming fluids,led the magma boiling easily,which was profitable for the precipitation of uranium.The mineralization of the leucogranite-type uranium deposit can be divided into three stages:crystallization differentiation of protomagma,superimposed reformation of late hydrothermal fluid and supergene oxidation.关键词
白岗岩型铀矿/铀成矿作用/成矿机理/达马拉造山带/纳米比亚Key words
leucogranite-type uranium deposit/uranium mineralization/metallogenetic mechanism/Damara Orogen/Namibia分类
天文与地球科学引用本文复制引用
陈金勇,范洪海,何德宝,耿瑞瑞,王生云,陈东欢,陈旭..纳米比亚白岗岩型铀成矿作用评述[J].世界核地质科学,2023,40(4):889-907,19.基金项目
中核集团集中研发项目"罗辛铀矿及外围资源扩大研究"和中国铀业有限公司与东华理工大学联合创新基金项目(编号:NRE2021-04)共同资助. （编号:NRE2021-04）
