江西科学2025，Vol.43Issue(6)：1073-1079,7.DOI:10.13990/j.issn1001-3679.2025.06.009
江西相山铀矿田碎斑熔岩中绿泥石特征及意义
Chlorite Characteristics and Significance in Brecciated Lava of the Xiangshan Uranium Field,Jiangxi Province
摘要
Abstract
The Xiangshan uranium field,the largest volcanic-hosted uranium deposit in Chi-na,has brecciated lava as one of its principal ore-hosting lithologies.Chloritization,identi-fied as a critical alteration type,is considered to hold indicative significance for uranium min-eralization processes.In this study,the chemical composition,formation temperatures,and oxygen fugacity characteristics of chlorite within three subfacies zones of the brecciated lava were systematically investigated through petrographic observations and electron probe micro-analysis.The key results are summarized as follows:1)Chlorite was characterized by FeO enrichment(31.36%～37.40%)and MgO depletion(4.90%～9.22%).Decreasing Al2O3 contents from the marginal subfacies(18.38 wt.%)to the central subfacies(15.53 wt.%)were interpreted as indicating reducing conditions;2)The chlorite was mainly chamosite and ferro-magnesian chlorite;3)Parent rocks were inferred to be argillaceous and mafic materi-als,possibly related to exotic breccias;4)A progressive decline in chlorite formation temper-atures(323℃→236℃)and oxygen fugacity(-43.09→-44.61)from the marginal to the central subfacies was observed,reflecting waning hydrothermal activity.This research eluci-dates the spatial zonation of hydrothermal alteration and provides geochemical constraints on the hydrothermal evolution during uranium mineralization.关键词
相山铀矿田/碎斑熔岩/绿泥石化/热液蚀变Key words
Xiangshan uranium field/brecciated lava/chloritization/hydrothermal alteration分类
天文与地球科学引用本文复制引用
SHEN Yujie,WAN Kang,ZHANG Xin,CHEN Yu,LIU Long,ZHANG Shuming..江西相山铀矿田碎斑熔岩中绿泥石特征及意义[J].江西科学,2025,43(6):1073-1079,7.基金项目
国家自然科学基金项目(41862006). （41862006）
