铀矿地质2024，Vol.40Issue(3)：480-487,8.DOI:10.3969/j.issn.1000-0658.2024.40.042
广西金鸡盆地砂岩型铀矿成矿机理和成矿模式研究
Study on Metallogenic Mechanism and Model of Sandstone-type Uranium Deposit in Jinji Basin,Guangxi
摘要
Abstract
Jinji Basin is a Meso-Cenozoic continental fault basin with the earliest discovery of sandstone type uranium mineralization in Guangxi.Its uranium host layers are featured with typical gray colour in red colour.The study on its metallogenic mechanism and metallogenic model may provide reference for uranium exploration with similar area of tectonic setting and horizon.This thesis analyzed its geological conditions of uranium mineralization from five aspects,including lithofacies paleogeography,paleoclimate,redox zone,uranium reservoir and uranium source by combining analogy analysis etc.Based on ground investigation and drilling disclosure,the basin uranium metallogenic mechanism and metallogenic model were summarized through analysis on orebody morphology,surrounding rock alteration and ore lithology as well as alteration characteristics.The uranium metallogenic space in Jinji Basin is controlled by gray reduction sand body.The studies showed that uranium mineralization in Jinji Basin had experienced four stages:the formation of thick purplish red oxidized sand bodies deposited in the early Lower Cretaceous which provided storage space for pooled uranium;formation of gray reduction sand bodies deposited in the late Lower Cretaceous which provided necessary geological conditions for uranium mineralization;the migration of U6+ in the oxidized sand body with pore water during the compaction diagenetic process and the reduction to U4+ in the sand body which were adsorbed by carbonaceous clasts and organic-containing mudstones in gray sandstone;the limited superposition mineralization in the small porosity rocks on the both sides of the structural plane by the late tectonic fluid activities.关键词
金鸡盆地/砂岩型铀矿/铀储层/成矿机理/成矿模式Key words
Jinji Basin/sandstone-type uranium deposit/uranium reservoir metallogenic mechanism/metallogenic model分类
天文与地球科学引用本文复制引用
赖传勇..广西金鸡盆地砂岩型铀矿成矿机理和成矿模式研究[J].铀矿地质,2024,40(3):480-487,8.基金项目
广西自然资源厅项目"广西藤县金鸡盆地铀矿普查"(编号:桂核办[2022]12号)资助. （编号:桂核办[2022]12号）
