化工矿产地质2026，Vol.48Issue(2)：128-135,8.
赣南大埠岩体与象洞岩体元素地球化学特征对比及其对稀土成矿的指示
Geochemical Contrast Between the Dabu and Xiangdong Plutons in Southern Jiangxi:Implications for Rare Earth Element Mineralization
摘要
Abstract
To explore the formation relationship between the granites and ionic rare earth deposits in Southern Jiangxi,this paper conducts a detailed comparative study of the geological context,petrological and geochemical characteristics,and patterns of mineralisation and enrichment of the rare earth deposits in the Dabu intrusion in southern Jiangxi,using the Xiangdong intrusion as a reference.Results show that the ore-forming parent rocks of both the Dabu and Xiangdong plutons are typical peraluminous high-K calc-alkaline rocks,exhibiting the typical characteristics of highly fractionated S-type granites.Both display significantly enrichment in Rb,Th,U,K,Nb,Nd,Zr,and Y,and strong depletion in Ba,P,Sr,and Ti,indicating crust-derived magma affinities.Moreover,the magma differentiation degree of the Dabu pluton is markedly higher than that of the Xiangdong pluton.Distinct differences exist in the total rare earth element contents,characteristic values,and partition patterns between the two plutons,suggesting that they may originate from different magma sources.The rare earth element distribution pattern of the weathered crust of the Dabu granite generally shows enrichment in light rare earth elements and depletion in heavy rare eatth elements,with an overall characteristic of being high on the left and low on the right.Combined with the trace element composition,these collectively indicate that the ore-forming materials of the Dabu rare earth deposit primarily originates from granites formed by partial melting of the crust.The weathered crust of the Dabu granite pluton presents obvious vertical zonation,with the rare earth element content showing a distribution pattern of depletion in the upper and lower parts and enrichment in the surface layer and middle part.The average total rare earth oxide content ΣRE2O3 in the middle completely weathered layer reaches 207.11 × 10-6,which is far higher than the industrial cutoff grade of rare earth ores,essentially constituting an industrial ore body.关键词
大埠岩体/离子型稀土矿/地球化学特征/赣南Key words
Dabu pluton/Ion-adsorption rare earth elements/Geochemical characteristics/Southern Jiangxi分类
天文与地球科学引用本文复制引用
冯晓琪,吴德海,张栋梁,张蕊,王舸,洪涛,孙以聆佳,张淑山..赣南大埠岩体与象洞岩体元素地球化学特征对比及其对稀土成矿的指示[J].化工矿产地质,2026,48(2):128-135,8.基金项目
江西省教育厅科学技术研究项目重点项目 江西足洞重稀土矿床精细矿物学与成矿机制研究(编号:GJJ214902)、江西省级财政出资地质勘查项目 江西省安远县石头坪离子型中重稀土成矿作用及绿色采选技术实验(编号:20220014)、江西应用技术职业学院博士启动基金项目 稀土与铀矿资源勘查开发教学科研团队(编号:JXYY-G2022004) （编号:GJJ214902）
