Chemistry and Evolution of Fergusonite—Group Minerals,Bayan Obo,Inner Mongolia |
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摘 要: |
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关 键 词: | 内蒙古 褐钇银矿物 分类标准 化学特征 命名原则 |
Chemistry and evolution of fergusonite-group minerals,Bayan Obo,inner Mongolia |
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Authors: | Gong Weiliang |
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Institution: | (1) Institute of Geochemistry, Acaderma Sinka, 550002 Guiyang |
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Abstract: | A new classification scheme of the fergusnoite-group minerals is suggested on the basis of mineral chemistry and high temperature
XRD. A number of new varieties such as M-thorian fergusonite-(Ce). M-neodymian fergusonite-(Ce). T-titanian fergusonite-(Nd)
and T-yttrian fergusonite-(Nd) have been recognized in the light of detailed chemical studies, particularly with reference
to REE, SRE and solid solution relationship. The results indicate strong REE and SRE differentiation and evolution in the
fergusonite group, which can be interpretated by differences in the stability of various REE complexes in response to variations
in physicochemical conditions during the multi-stage mineralization process in the Bayan Obo ore deposit. The crystallization
of the minerals is closely related to hydrolysis of REE and Nb complexes. REE (OH)3 Nb(OH)5 coprecipitation, dehydration, polymerization and nucleation.The significance of SRE (Eu)in the western part of the deposit
is emphasized.
This project was finantially supported by the National Natural Science Foundation of China. |
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