地质论评2026，Vol.72Issue(5)：1454-1462,9.DOI:10.16509/j.georeview.2026.01.032
云南永善水竹地区宣威组底部稀土元素赋存状态研究
Study on theoccurrence state of rare earth elements at the bottom of the Xuanwei Formation in the Shuizhu area,Yongshan,Yunnan
摘要
Abstract
Objectives:This study intends to investigate the occurrence states of rare earth elements(REEs)in the paleo-terrigenous sedimentary rare earth deposits at the bottom of the Xuanwei Formation in the Shuizhu area,northeastern Yunnan,within the contiguous region of Sichuan,Yunnan and Guizhou.The research is expected to provide crucial clues and a scientific basis for mineral exploration and comprehensive resource utilization of the same type of sedimentary rare earth deposits in the study area and across China. Methods:In this paper,a variety of rock and mineral testing techniques including basic chemical analysis,X-ray diffraction(XRD)analysis,scanning electron microscopy(SEM)analysis,and rare earth leaching experiments were employed to conduct an in-depth mineralogical study on the paleo-continental sedimentary rare earth deposits in the Lianfeng area of Yongshan County,Zhaotong City,Yunnan Province. Results:The analysis results show that the average grade of total rare earth oxides(TREO)ranges from 0.12％to 0.21％,with the maximum content of a single sample reaching 0.23％.The ratio of light rare earths to heavy rare earths is between 1.55 and 2.88,indicating a light-rare-earth-dominated characteristic,where light rare earths account for 61％～73％of the total rare earth content.Mineralogically,the ore is dominated by clay minerals with a total content of approximately 75％,among which kaolinite is the predominant component(45％),followed by montmorillonite(36％)and chlorite(19％).The contents of other minerals are trace,and independent rare earth minerals are extremely scarce.Leaching tests and measurements reveal that the ion-adsorbed phase accounts for only 0.94％～3.86％of the total rare earths,suggesting a relatively low content of ion-exchangeable rare earths.The results indicate that the rare earth elements in the samples are likely to occur as rare-earth-enriched nanomineral particles hosted within clay minerals such as kaolinite.关键词
二叠系宣威组/沉积型稀土矿/赋存状态/云南昭通永善Key words
Permian Xuanwei Formation/sedimentary rare earth ore/occurrence state/Yongshan,Zhaotong,Yunnan引用本文复制引用
王东晖,何松,吴亮,李德宗,肖长源,张浩,于一帆,李致伟,柳勇,李明..云南永善水竹地区宣威组底部稀土元素赋存状态研究[J].地质论评,2026,72(5):1454-1462,9.基金项目
本文为地质调查项目"滇东—黔西黄葛树等4幅1∶5万矿产地质调查"(编号:DD20220967),"云南乌蒙山苞谷脑等3幅1∶5万矿产地质调查"(编号:DD20240207104)的成果. This paper is supported by the 1∶50000 Mineral Geological Survey of Four Sheets Including Huanggeshu in Eastern Yunnan-western Guizhou(No.DD20220967)and Mineral Geological Survey of Three 1∶50000 Scale Maps Including Baogunao in the Wumeng Mountains,Yunnan Province(No.DD20240207104) （编号:DD20220967）
