矿床地质2026，Vol.45Issue(2)：391-404,14.DOI:10.16111/j.0258-7106.2026.02.010
鄂东南丰山矿田铜金矿床方解石的稀土元素地球化学特征
REE geochemistry of calcites from copper-gold deposits in Fengshan ore field,southeastern Hubei
摘要
Abstract
The genetic connection between skarn Cu-Au deposits and peripheral distal low-temperature Au deposits re-mains controversial.Calcite,a ubiquitous alteration mineral in both deposit types,provides a valuable geochemi-cal tracer for mineralization processes.This study investigates the hydrothermal rare earth element(REE)geo-chemistry of calcites from the Jilongshan skarn Cu-Au deposit,and the Caojiashan and Zhulintang distal low-temperature Au deposits within the Fengshan orefield,southeastern Hubei,to elucidate genetic links between these contrasting deposit styles.Results show that calcites from both deposit types exhibit light REE(LREE)-en-riched patterns(LaN/YbN=2.21～20.28),primarily controlled by REE complex stability in the fluid and mineral crystallization differentiation.REE patterns indicate a dominant magmatic-hydrothermal fluid source associated with Yanshanian magmatism.Europium anomalies(δEu)effectively record redox conditions and temperature:calcites from the Jilongshan Cu-Au deposit display positive δEu anomalies(0.92～1.45),indicating a high-temper-ature reducing environment;ore-stage calcites from Zhulintang typically show negative δEu anomalies(as low as 0.56)and lower ΣREE,reflecting a low-temperature oxidizing environment;ore-stage and post-ore calcites from Caojiashan differ significantly in both ΣREE and δEu,with the latter's elevated values attributed to Mn2+influence.Integrating these findings with regional geological evidences,we propose that the distal low-temperature Au depos-its and the skarn Cu-Au deposit constitute a unified magmatic-hydrothermal mineralization system.关键词
成矿流体/稀土元素/C-O同位素/丰山矿田/鄂东南矿集区Key words
ore-forming fluid/REE geochemistry/C-O isotope/Fengshan ore field/southeastern Hubei ore concentration area分类
天文与地球科学引用本文复制引用
葛昊,谢桂青,吴晓林..鄂东南丰山矿田铜金矿床方解石的稀土元素地球化学特征[J].矿床地质,2026,45(2):391-404,14.基金项目
本文得到国家自然科学基金项目(编号:92162217、92462306、41925011)资助 （编号:92162217、92462306、41925011）
