铀矿地质2026，Vol.42Issue(1)：82-94,13.DOI:10.3969/j.issn.1000-0658.2026.42.006
赣中金滩岩体印支晚期二云母花岗岩年代学、地球化学特征及地质意义
Chronological and Geochemical Characteristics of Late Indosinian Two-mica Granite in Jintan Pluton,Central Jiangxi and Their Geological Significance
摘要
Abstract
Located in central Jiangxi Province,Jintan pluton is a complex pluton formed in Indosinian period and one medium-sized Xiali uranium deposit has been identified in the pluton,However,studies on the uranium-bearing granites are seldom reported.This paper investigated the petrographic,geochronological,and geochemical characteristics of two-mica granites in the pluton and explored their genetic relationship with uranium mineralization.Particular attention was given to the petrogenesis,source characteristics,tectonic setting,and mineralization association.Zircon U-Pb dating yields the crystallization ages of 215.5 Ma±1.0 Ma and 215.0 Ma±1.7 Ma,indicating the granite emplaced during Late Indosinian period.These granites are characterized by high silica and alkali contents,with peraluminous compositions.Geochemical analyses reveal that the granites are enriched in large-ion lithophile elements(Rb,U,Th)and depleted in high-field-strength elements(Ba,Sr,Eu),which are consistent with those of Indosinian S-type granites in South China.The elevated Rb/Sr and Rb/Ba ratios,together with low CaO/Na2O values,suggested the two-mica granite were derivated from the partial melting of argillaceous crustal sources which originated from the Paleoproterozoic crustal materials in a post-orogenic extensional tectonic setting.These granites were found with the uranium concentrations ranging from 11.11×10-6 to 42.27×10-6,and might have provided uranium source for the subsequent uranium mineralization events.关键词
二云母花岗岩/S型花岗岩/地球化学/岩石成因/产铀潜力/赣中Key words
two-mica granite/S-type granite/geochemistry/petrogenesis/uranium-production potential/central Jiangxi province分类
天文与地球科学引用本文复制引用
刘龙,张树明,袁庚红,孟平虹,许谱林,章闽..赣中金滩岩体印支晚期二云母花岗岩年代学、地球化学特征及地质意义[J].铀矿地质,2026,42(1):82-94,13.基金项目
赣东学院博士科研启动基金项目(编号:122000802)资助. （编号:122000802）
