Linnen R. L. auteur aut IRD Van Lichtervelde Marieke auteur aut IRD Cerny P. auteur aut IRD text journalArticle eng text/pdf born digital access Rare-element granitic pegmatites are well recognized for the diversity and concentrations of metal ores that they host. The supply of some of these elements is of concern, and the European Commission recently designated metals such as tantalum and niobium as "critical materials" or "strategic resources." Field relationships, mineral chemistry, and experimental constraints indicate that these elements are concentrated dominantly by magmatic processes. The granitic melts involved in these processes are very unusual because they contain high concentrations of fluxing compounds, which play a key role at both the primary magmatic and metasomatic stages. In particular, the latter may involve highly fluxed melts rather than aqueous fluids. specialized strategic rare element fractionation metasomatism ore genesis 064 8 4 275-280 2012 1811-5209 https://www.documentation.ird.fr/hor/PAR00009310 10.2113/gselements.8.4.275 1811-5209 [F B010083581] https://www.documentation.ird.fr/hor/PAR00009310 https://www.documentation.ird.fr/intranet/publi/2021-12/010083581.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2012-11-09 2021-12-16 PAR00009310 fre