铀矿地质2025，Vol.41Issue(6)：1023-1042,20.DOI:10.3969/j.issn.1000-0658.2025.41.071
鹿井小山铀矿床深部绿泥石地球化学特征及其对铀成矿特征的指示
Geochemical Characteristics and Metallogenic Implications of Chlorite in the Deep of Xiaoshan Uranium Deposit,Lujing Uranium Ore Field
摘要
Abstract
Xiaoshan uranium deposit,located in the central part of Lujing ore uranium field,is a typical fracture-alteration type associated with alkali metasomatism.Chlorite is widely distributed in Xiaoshan deposit,chloritization is a hydrothermal alteration process associated with uranium mineralization.This study focuses on the mineralogical and geochemical characteristics of chlorite and uranium minerals from Xiaoshan uranium deposit,so as to find the types,genesis,and formation environment of chlorite and their relation to uranium metallization.The results show that chlorite in Xiaoshan deposit can be classified into four types:fracture-filling,disseminated,biotite-altered,and feldspar-altered.Mineralogical and geochemical analyses indicate that the first two types are closely related to uranium mineralization,whereas the latter two are not.Classification diagrams and cation-Mg plots suggest that most chlorite belongs to the Fe-chlorite type,with a small amount of Fe-Mg chlorite,reflecting multiple stages of hydrothermal activity.Chlorite geothermometry indicates that chlorite associated with uranium mineralization formed at temperatures ranging from 355℃to 410℃,with an average of 379℃,while those unrelated to uranium mineralization formed at higher temperatures of 366℃to 435℃,averaging 401℃.The existence of vein altered crystalline uranium indicates that the deposit has the characteristics of high temperature hydrothermal uranium mineralization.In conclusion,all four types of chlorite in Xiaoshan uranium deposit are Fe-rich.Uranium mineralization occurred in a reducing environment.The chlorite unrelated to uranium mineralization formed at higher temperatures(401℃)than those coexisting with uranium(379℃),suggesting that temperature decrease and the reducing environment may played a critical role in uranium precipitation.关键词
绿泥石/铀矿物/地质温度计/电子探针/小山铀矿床Key words
chlorite/uranium minerals/geothermometer/electron microprobe/Xiaoshan uranium deposit分类
地质学引用本文复制引用
刘绪江,余驰达,党飞鹏,李志鹏,刘文恒,王凯兴,孙立强,刘晓东..鹿井小山铀矿床深部绿泥石地球化学特征及其对铀成矿特征的指示[J].铀矿地质,2025,41(6):1023-1042,20.基金项目
东华理工大学博士科研基金(编号:DHBK2020013)和中国铀业有限公司-东华理工大学核资源与环境国家重点实验室联合创新基金(编号:2023NRE-LH-13)联合资助. （编号:DHBK2020013）
