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<title lang=en>Fluorine-rich xenotime from the world-class madeira Nb-Ta-Sn deposit associated with the albite-enriched granite aat Pitinga, Amazonia, Brazil</title>
<creator>Bastos Neto, Artur C.</creator>
<creator>Pires, Amanda C.</creator>
<creator>Barbanson, Luc</creator>
<creator>Chauvet, Alain</creator>
<contributor>Instituto de Geociências ; Universidade Federal do Rio Grande do Sul [Porto Alegre] (UFRGS)</contributor>
<contributor>Instituto de Geociências ; Universidade Federal de Roraima</contributor>
<contributor>Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) ; Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) - Institut national des sciences de l'Univers (INSU - CNRS) - Université d'Orléans (UO) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Agência para o Desenvolvimento Tecnológico da Indústria Mineral do Brasil (ADIMB), the Departamento Nacional da Produção Mineral (DNPM), the Financiadora de Estudos e Projetos (FINEP), the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and the CTMINERAL for financial support</contributor>
<description>International audience</description>
<source>The Canadian Mineralogist</source>
<identifier>insu-00805907</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00805907</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-00805907</source>
<source>The Canadian Mineralogist, 2012, 50, pp.1453-1466. 〈10.3749/canmin.50.6.1453〉</source>
<identifier>DOI : 10.3749/canmin.50.6.1453</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.3749/canmin.50.6.1453</relation>
<language>en</language>
<subject lang=it>xenotime</subject>
<subject lang=it>yttrium</subject>
<subject lang=it>rare-earth elements</subject>
<subject lang=it>fluorine</subject>
<subject lang=it>albite-enriched granite</subject>
<subject lang=it>Pitinga</subject>
<subject lang=it>Amazonia</subject>
<subject lang=it>Brazil</subject>
<subject>[SDU.STU.MI] Sciences of the Universe [physics]/Earth Sciences/Mineralogy</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The Madeira deposit (Sn, Nb, Ta) at Pitinga, Amazonia, in Brazil, is associated with the albite-enriched facies of the A-type Madeira granite (~1,820 Ma). Fluorine (cryolite), Y, REE, Li, Zr, and Th are potential by-products of the disseminated ore. We studied the xenotime from the core albite-enriched (CAG), transitional albite-enriched granite (TAG) and pegmatitic albite-enriched granite (PAG). In all these rocks, xenotime is magmatic, has high HREE contents (0.37 to 0.54 atoms per formula unit; LREE are not detected), and low U, Th and Ca content. The CAG xenotime is the richest in REE, followed by that in the PAG and TAG units. Fluorine was detected in all xenotime crystals from CAG (up to 5.10%) and from PAG (up to 1.40%) and in most crystals from TAG (up to 0.68%). Where the xenotime is richer in F, the Na and Si increase, the P, Ca, and the effectiveness of a thorite-type substitution decrease. Fluorine controls the ratio REE/Y; the richer the xenotime in F, the richer it is in REE, in particular Er and Yb. The cell parameters a and c are significantly shortened in F-rich xenotime. There is no evidence of OH in the structure. We contend that fluorine substitutes for O to form PO3F tetrahedra, as in bobdownsite. The formation of the PO3F tetrahedra in the xenotime accounts well for the compatibility between the crystallographic characteristics and the chemical composition.</description>
<date>2012</date>
</dc>
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