Caracterização química de cromitas nos maciços de cromínia e mairipotaba, goiás, Brasil

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dc.contributor.authorAngeli, Nélson [UNESP]
dc.contributor.authorBeltran Navarro, Guillermo Rafael [UNESP]
dc.contributor.authorFarias Vlach, Silvio Roberto [UNESP]
dc.contributor.authorZanardo, Antenor
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-27T11:24:38Z
dc.date.available2014-05-27T11:24:38Z
dc.date.issued2010-03-01
dc.description.abstractMetaultramafic bodies tectonically emplaced within the metasedimentary sequence of the Araxá Group are associated with an ophiolitic melange in southeast Goiás. In the region of Crominia - Mairipotaba, they occur as lenticular bodies aligned E-W. Cumulate textures and geochemical data indicate that the parent rocks had harzburgitic to dunitic compositions. Relicts of primary crystals of olivine and orthopyroxene are suggestive of amphibolite facies metamorphic re-equilibration fabrics, even though the paragenesis and mineral associations of these metaultramafic rocks are typical of greenschist facies (T < 550°C and P = 5.5 kbar). The chromitites exhibit massive to breccioid structure and pull-apart texture, with chromite crystals around 0.5 mm in size. Chromite concentrations in the chromitite levels reach 70 to 85% by volume of the rock. The crystals are dispersed in the matrix, which is composed essentially of serpentine, and subordinately of chlorite and talc. The textures and geochemical data (Cr 2O 3 x TiO 2 and Mg x Cr ratios present in the chromitite) are similar to those observed in ophiolitic complexes. Hence, they correspond to allochthonous bodies (Alpine type) associated with an ophiolitic mélange.en
dc.description.affiliationDepartamento de Petrologia e Metalogenia UNESP, Av. 24-A 1.515, CEP 13506-900, Rio Claro, SP
dc.description.affiliationPós-graduação em Geologia Regional Instituto de Geociências e Ciências Exatas UNESP, Rio Claro, SP
dc.description.affiliationDepartamento de Mineralogia e Geotectônica Instituto de Geociências USP, São Paulo, SP
dc.description.affiliationUnespDepartamento de Petrologia e Metalogenia UNESP, Av. 24-A 1.515, CEP 13506-900, Rio Claro, SP
dc.description.affiliationUnespPós-graduação em Geologia Regional Instituto de Geociências e Ciências Exatas UNESP, Rio Claro, SP
dc.format.extent87-99
dc.identifierhttp://dx.doi.org/10.5327/Z1519-874X2010000100007
dc.identifier.citationGeologia USP - Serie Cientifica, v. 10, n. 1, p. 87-99, 2010.
dc.identifier.doi10.5327/Z1519-874X2010000100007
dc.identifier.file2-s2.0-77951069166.pdf
dc.identifier.issn1519-874X
dc.identifier.lattes0864918679971906
dc.identifier.lattes6893272900174059
dc.identifier.scopus2-s2.0-77951069166
dc.identifier.urihttp://hdl.handle.net/11449/71594
dc.language.isopor
dc.relation.ispartofGeologia USP: Serie Cientifica
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectAraxá group
dc.subjectBrasilia belt
dc.subjectChromite
dc.subjectMineral chemistry
dc.subjectOphiolitic melange
dc.subjectchemical composition
dc.subjectchromite
dc.subjectchromitite
dc.subjectconcentration (composition)
dc.subjectgeochemistry
dc.subjectgreenschist facies
dc.subjectmelange
dc.subjectolivine
dc.subjectophiolite
dc.subjectorthopyroxene
dc.subjectparagenesis
dc.subjectparent body
dc.subjectsource rock
dc.subjectBrasilia Belt
dc.subjectBrazil
dc.subjectGoias
dc.titleCaracterização química de cromitas nos maciços de cromínia e mairipotaba, goiás, Brasilpt
dc.title.alternativeChemical characterization of chromite from the crominia and mairipotaba massifs, goiás, Brazilen
dc.typeArtigo
dcterms.licensehttp://www.revistas.usp.br/guspsc/about/editorialPolicies#openAccessPolicy
unesp.author.lattes0864918679971906
unesp.author.lattes6893272900174059
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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