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Local concentration of middle and heavy rare earth elements in the col on the weathered crust elution-deposited rare earth ores 被引量:10
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作者 Zhenyue Zhang Ningjie Sun +1 位作者 Zhengyan He Ru'an Chi 《Journal of Rare Earths》 SCIE EI CAS CSCD 2018年第5期552-558,共7页
This present study focused on investigating the content and relative enrichment multiple of rare earth elements(REEs) in different terrain of weathered ore body, and the value of light rare earth elements/middle and... This present study focused on investigating the content and relative enrichment multiple of rare earth elements(REEs) in different terrain of weathered ore body, and the value of light rare earth elements/middle and heavy rare earth elements(LREEs/HREEs), in order to understand the mobilization and redistribution of HREEs, Furthermore, the abrasion pH was investigated as well, The results show that the average contents of HREEs in the knap, ridge and col are 37.26, 61.71, and 271.3 μg/g, respectively. The value of LREEs/HREEs is decreased from 16.78 to 7.914 between knap and col and the relative enrichment multiple of HREEs is as follows: CCol-HREEs 〉 CRidge-HREEs 〉 0. It is indicated the HREEs is concentrated in the col and the enrichment degree of HREEs is stronger than the ridge and the knap. Rare earth elements fractionation is exhibited in the different terrain of weathered ore body. Based on this study, the finding that HREEs concentrate in the lower terrain of weathered crust elution-deposited rare earth ores, such as in the col, would become a marker or indicator to search for middle and heavy rare earth enriched zone. 展开更多
关键词 Weathered crust elution-deposited rareearth ores Topography conditions Middle and heavy rare earth elements Local concentration
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Dissolved rare earth elements estimation of ion-absorption rare earth ores using reflectance spectroscopy in south Jiangxi province,China 被引量:1
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作者 Jingjing Dai Denghong Wang Zhenghui Chen 《Journal of Rare Earths》 SCIE EI CAS CSCD 2021年第10期1300-1310,I0005,共12页
Ion-absorption rare earth ores are an important mineral resource in China.Nowadays,the unauthorized mining has become a serious problem,resulting in severe water pollution and the wastage of rare earth elements(REEs).... Ion-absorption rare earth ores are an important mineral resource in China.Nowadays,the unauthorized mining has become a serious problem,resulting in severe water pollution and the wastage of rare earth elements(REEs).Being able to estimate the concentration of dissolved REEs in water bodies near mines is essential for tackling this environmental problem.Conventionally,quantitative analyses of the contents of dissolved REEs are performed using laboratory-based techniques,which can be time consuming and costly.Spectral reflectance is a rapid and cost-effective means of characterizing the chemical compositions of light-absorbing materials.In this study,reflectance spectroscopy was performed on dissolved REEs,and the correlation between their reflectance characteristics and REE content was determined.A total of 50 aqueous media samples collected in south Jiangxi Province and 25 laboratory-produced aqueous media samples were tested,and their reflectance spectra and REE contents were measured using reflectance spectroscopy and inductively coupled plasma mass spectrometry,respectively.Next,the reflectance,differential reflectance,and absorption depth were analysed based on the REE content.Six diagnostic absorption features related to REEs are recognised in the visible and near-infrared wavelength regions,along with several smaller peaks.It indicates that the results of the absorption depth analysis are in accordance with the absorption spectra characteristics of the REEs,with the R2 value being higher than 0.97.The intensity of each of the six absorption bands exhibits a linear correlation to the total REE content.Therefore,linear regressio n models can be derived for estimating the total concentration of REEs in aqueous media samples.What’s more,the detection limit for REEs is determined to be about 30μg/L.Thus,it can be concluded that reflectance spectroscopy is a suitable technique for estimating the concentration of dissolved REEs. 展开更多
关键词 rare earth elements Ion-absorption rare earth ores Spectroscopy concentration Correlation analysis
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琼河坝矿集区花岗岩体的Sr-Nd,Pb同位素特征及地质意义 被引量:4
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作者 王得权 刘建朝 +4 位作者 程建新 彭素霞 张海东 郑利宏 王瑞美 《矿物岩石》 CAS CSCD 北大核心 2014年第1期70-77,共8页
琼河坝地区在志留纪一泥盆纪频繁的岩浆活动与成矿关系密切。矿集区中花岗岩∑REE含量23.16×10-6~110.24×10-6,平均值68.19×10-6,总体上稀土含量较低。(La/Yb)N一3.23~10.97平均值为5.74,显示轻、重稀土... 琼河坝地区在志留纪一泥盆纪频繁的岩浆活动与成矿关系密切。矿集区中花岗岩∑REE含量23.16×10-6~110.24×10-6,平均值68.19×10-6,总体上稀土含量较低。(La/Yb)N一3.23~10.97平均值为5.74,显示轻、重稀土分馏不明显,且轻稀土元素较重稀土元素富集。蒙西、琼河坝、和尔赛三个花岗岩体Sr-Nd、Pb同位素值很近,表明琼河坝花岗岩具有相近的成因。(87Sr/86Sr)、值为0.70401~0.70442,平均值为0.70419;(148Nd/144Nd),值为0.512300~0.512478,平均值为0.512415;(208Pb/204Pb),值17.600~17.910,平均值为17.738,(207Pb/204Pb),值为15.410~15.547,平均值为15.459,(206Pb/204Pb).值为37.250~38.019平均值为37.534。表现出壳幔混染的特征。εsr(t)值为一0.3~7.8,eNd(ε)值为2.9~7.2,为较小的正值,表现出洋壳的特征。花岗岩Al2O3,sr,Y,Yb和3Eu的特征与埃达克岩相近,可能为俯冲洋壳熔融的产物。因此该地区众多铜矿点的出现,应该与埃达克岩有关。 展开更多
关键词 琼河坝矿集区 稀土元素 Sr-Nd Pb同位素 埃达克岩
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