PEGMATITES IN SOUTHEASTERN BRAZIL

PEGMATITES IN SOUTHEASTERN BRAZIL

dc.contributoren-US
dc.contributorpt-BR
dc.creatorBILAL, ESSAÏD
dc.creatorNEVES, JOSÉ MARQUES CORREIA
dc.creatorFUZIKAWA, KAZUO
dc.creatorHORN, ADOLF HEINRICH
dc.creatorMARCIANO, VITÓRIA RÉGIA PERES DA ROCHA OLIVEIROS
dc.creatorFERNANDES, MARIA LOURDES SOUZA
dc.creatorMOUTTE, JAQUES
dc.creatorMELLO, FERNANDO MACHADO DE
dc.creatorNASRAQUI, MOHAMED
dc.date2017-03-29
dc.date.accessioned2023-06-19T16:35:22Z
dc.date.available2023-06-19T16:35:22Z
dc.identifierhttps://ppegeo.igc.usp.br/index.php/rbg/article/view/10655
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/6693877
dc.descriptionTwo pegmatite groups are represented in southeastern Brazil. The first group, resulting from fractional crystallization, is linked to syn-tectonic granites (580 Ma – deformation event D1) and the second one is associated with another partial melting event of the crust which simultaneously produced porphyritic leucogranites [(520-500 Ma)- later deformation event D2 ] and pegmatites themselves. The Fe/Mn ratios of tourmalines, micas and columbite-tantalites decrease continuously from simple pegmatites to gem quality elbaite-rich ones. The Fe/Mn ratio has been used as a qualitative fractionation index which seems to reflect the regional zoning of the first pegmatites group around a hidden granite body. The Fe/Mn ratio values correlate negatively with Na and Li contents in tourmalines and mica. The REE, Nb, Co and Zn contents in tourmalines, micas, and columbite-tantalites are controlled by their mineral assemblages.en-US
dc.descriptionTwo pegmatite groups are represented in southeastern Brazil. The first group, resulting from fractional crystallization, is linked to syn-tectonic granites (580 Ma – deformation event D1) and the second one is associated with another partial melting event of the crust which simultaneously produced porphyritic leucogranites [(520-500 Ma)- later deformation event D2 ] and pegmatites themselves. The Fe/Mn ratios of tourmalines, micas and columbite-tantalites decrease continuously from simple pegmatites to gem quality elbaite-rich ones. The Fe/Mn ratio has been used as a qualitative fractionation index which seems to reflect the regional zoning of the first pegmatites group around a hidden granite body. The Fe/Mn ratio values correlate negatively with Na and Li contents in tourmalines and mica. The REE, Nb, Co and Zn contents in tourmalines, micas, and columbite-tantalites are controlled by their mineral assemblages.pt-BR
dc.formatapplication/pdf
dc.languageeng
dc.publisherSociedade Brasileira de Geologiapt-BR
dc.relationhttps://ppegeo.igc.usp.br/index.php/rbg/article/view/10655/10152
dc.rightsDireitos autorais 2017 Revista Brasileira de Geociênciaspt-BR
dc.sourceRevista Brasileira de Geociências; v. 30, n. 2 (2000); 234-237en-US
dc.sourceRevista Brasileira de Geociências; v. 30, n. 2 (2000); 234-237es-ES
dc.sourceRevista Brasileira de Geociências; v. 30, n. 2 (2000); 234-237pt-BR
dc.source0375-7536
dc.subjectSchorl;Elbaites; Gems; Columbite-tantalite; Li-pegmatites; Minas Gerais-Brazil.en-US
dc.subjectSchorl;Elbaites; Gems; Columbite-tantalite; Li-pegmatites; Minas Gerais-Brazil.pt-BR
dc.titlePEGMATITES IN SOUTHEASTERN BRAZILen-US
dc.titlePEGMATITES IN SOUTHEASTERN BRAZILpt-BR
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typept-BR


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