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- W2912398474 abstract "On a procede a l'examen des donnees existantes sur la composition chimique et les proprietes structurales de columbite-tantalite, ferrotapiolite-manganotapiolite, ixiolite, wodginite, rutile tantalifere et niobifere, cassiterite niobo-tantalifere, et du groupe de pyrochlore. La comprehension de la cristallochimie de certaines de ces especes apparait quelque peu erronee. La synthese des observations sur les parageneses primaires des mineraux de Nb-Ta, caracteristiques des differents types de pegmatites a elements rares, met en evidence des lacunes considerables lorsque l'on reinterprete les anciennes donnees partiellement desuetes. Par contre, les donnees sur les mineraux exotiques niobo-tantaliferes, recemment decouverts, sont completees par un resume bien documente des phenomenes de remplacement et d'alterations tardives. On met en evidence des variations considerables du fractionnement chimique de la columbite-tantalite dans certaines pegmatites et districts pegmatitiques. Afin de comprendre les facteurs qui president a ce fractionnement, il est indispensable d'acquerir les donnees supplementaires sur differents types de pegmatites, completees par des etudes experimentales. Les conditions de stabilite chimique et structurale sont mal connues. Leur comprehension necessite une etude experimentale detaillee, menee dans des conditions comparables a celles de la cristallisation des bains et fluides pegmatitiques ." @default.
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- W2912398474 date "1985-01-01" @default.
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- W2912398474 title "Some recent advances in the mineralogy and geochemistry of Nb and Ta in rare-element granitic pegmatites" @default.
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- W2912398474 doi "https://doi.org/10.3406/bulmi.1985.7846" @default.
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