地质学报2025，Vol.99Issue(4)：1312-1331,中插46,21.DOI:10.19762/j.cni.dizhixuebao.2023385
黔北遵义二叠纪沉积碳酸锰矿中稀土元素富集过程
Enrichment process of rare earth elements in Permian sedimentary manganese carbonate deposits from the Zunyi area,northern Guizhou
摘要
Abstract
As strategic and critical minerals,rare earth elements and yttrium(REY)have long been of great concern.Recent studies have reported that numerous sedimentary manganese(Mn)ores are significantly enriched in REY(＞500×10-6).However,the source,carriers,and enrichment process of the REY in sedimentary Mn ores remain poorly constrained.Notably,careful compositional analyses have revealed substantial REY enrichment in the Zunyi Mn deposits.Specifically,the average ΣREY content in the ores and the underlying tuffaceous clay is 658 × 10-6 and 1465 × 10-6,respectively,which is mainly characterized by the enrichment of La,Ce,Nd,and Y,and is the first reported REY-bearing carbonate Mn deposits in China.The lower ore-bed developed hydrothermal brecciated Mn ores,and monazite veins crosscut rhodochrosite were observed in Mn ores,and coupled with Mn ores has REY fractionation characteristics similar to the underlying tuff,indicate that the enrichment of Mn and REY primarily originated from the magmatic-hydrothermal system of the Emeishan Large Igneous Province(ELIP).The REY in Mn ores and tuffaceous claystone mainly occurs as monazite,xenotime,and goyazite,indicating phosphate minerals as the principal REY carriers in the Zunyi Mn deposits.Monazite and xenotime are mainly fine-grained(＜10 μm)anhedral particles form,coexisting with authigenic minerals(e.g.,rhodochrosite and capillitite),and closely symbiosis with residual Fe-Mn oxides and altered tuffs within rhodochrosite.Meanwhile,goyazite appears in microcrystalline or colloidal form,closely symbiosis with fine-grained minerals(e.g.,illite and quartz),and locally coexisting with residual altered volcanic debris.In conclusion,we suggest that the REY enrichment was controlled by ELIP paleotectono-magma-hydrothermal activity,multiple carriers,and multiple sedimentary stages.REY initially occurs in Fe-Mn oxide and tuff and then transfers to phosphate minerals during the early diagenesis-alteration process.关键词
REY富集/含稀土磷酸盐/碳酸锰矿床/二叠纪/遵义Key words
REY enrichment/REY-bearing phosphate/Mn carbonate deposit/Permian/Zunyi引用本文复制引用
徐海,高军波,杨瑞东,徐进鸿,刘志臣,谯文浪,叶飞,张旭..黔北遵义二叠纪沉积碳酸锰矿中稀土元素富集过程[J].地质学报,2025,99(4):1312-1331,中插46,21.基金项目
本文为国家重点研发计划项目(编号2022YFC2903403)、国家自然科学基金项目(编号42362014,42163006,42462008)、贵州省科技计划项目(编号黔科合基础-ZK[2023]一般463、黔科合基础-ZK[2024]一般684)、贵州省教育厅高等学校科学研究青年项目(编号黔教技[2022]349号,黔教技[2022]350号)、贵州省地质矿产勘查开发局重大科研项目(编号黔地矿科合[2021]03)、铜仁学院博士科研启动基金(编号trxyDH202214)、铜仁市博士人才科技计划项目(编号铜市科研(2024)3号)和喀斯特地质资源与环境教育部重点实验室(编号贵州大学)开放基金(编号KST202203)联合资助的成果. （编号2022YFC2903403）
