Caracterização química de cromitas nos maciços de cromínia e mairipotaba, goiás, Brasil
dc.contributor.author | Angeli, Nélson [UNESP] | |
dc.contributor.author | Beltran Navarro, Guillermo Rafael [UNESP] | |
dc.contributor.author | Farias Vlach, Silvio Roberto [UNESP] | |
dc.contributor.author | Zanardo, Antenor | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.contributor.institution | Universidade de São Paulo (USP) | |
dc.date.accessioned | 2014-05-27T11:24:38Z | |
dc.date.available | 2014-05-27T11:24:38Z | |
dc.date.issued | 2010-03-01 | |
dc.description.abstract | Metaultramafic 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.affiliation | Departamento de Petrologia e Metalogenia UNESP, Av. 24-A 1.515, CEP 13506-900, Rio Claro, SP | |
dc.description.affiliation | Pós-graduação em Geologia Regional Instituto de Geociências e Ciências Exatas UNESP, Rio Claro, SP | |
dc.description.affiliation | Departamento de Mineralogia e Geotectônica Instituto de Geociências USP, São Paulo, SP | |
dc.description.affiliationUnesp | Departamento de Petrologia e Metalogenia UNESP, Av. 24-A 1.515, CEP 13506-900, Rio Claro, SP | |
dc.description.affiliationUnesp | Pós-graduação em Geologia Regional Instituto de Geociências e Ciências Exatas UNESP, Rio Claro, SP | |
dc.format.extent | 87-99 | |
dc.identifier | http://dx.doi.org/10.5327/Z1519-874X2010000100007 | |
dc.identifier.citation | Geologia USP - Serie Cientifica, v. 10, n. 1, p. 87-99, 2010. | |
dc.identifier.doi | 10.5327/Z1519-874X2010000100007 | |
dc.identifier.file | 2-s2.0-77951069166.pdf | |
dc.identifier.issn | 1519-874X | |
dc.identifier.lattes | 0864918679971906 | |
dc.identifier.lattes | 6893272900174059 | |
dc.identifier.scopus | 2-s2.0-77951069166 | |
dc.identifier.uri | http://hdl.handle.net/11449/71594 | |
dc.language.iso | por | |
dc.relation.ispartof | Geologia USP: Serie Cientifica | |
dc.rights.accessRights | Acesso aberto | |
dc.source | Scopus | |
dc.subject | Araxá group | |
dc.subject | Brasilia belt | |
dc.subject | Chromite | |
dc.subject | Mineral chemistry | |
dc.subject | Ophiolitic melange | |
dc.subject | chemical composition | |
dc.subject | chromite | |
dc.subject | chromitite | |
dc.subject | concentration (composition) | |
dc.subject | geochemistry | |
dc.subject | greenschist facies | |
dc.subject | melange | |
dc.subject | olivine | |
dc.subject | ophiolite | |
dc.subject | orthopyroxene | |
dc.subject | paragenesis | |
dc.subject | parent body | |
dc.subject | source rock | |
dc.subject | Brasilia Belt | |
dc.subject | Brazil | |
dc.subject | Goias | |
dc.title | Caracterização química de cromitas nos maciços de cromínia e mairipotaba, goiás, Brasil | pt |
dc.title.alternative | Chemical characterization of chromite from the crominia and mairipotaba massifs, goiás, Brazil | en |
dc.type | Artigo | |
dcterms.license | http://www.revistas.usp.br/guspsc/about/editorialPolicies#openAccessPolicy | |
unesp.author.lattes | 0864918679971906 | |
unesp.author.lattes | 6893272900174059 | |
unesp.campus | Universidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claro | pt |
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