The Belterra Clay On The Bauxite Deposits Of Rondon Do Pará, Eastern Amazon

dc.citation.issue3pt_BR
dc.citation.spage473pt_BR
dc.citation.volume48pt_BR
dc.creatorNEGRÃO, Leonardo Boiadeiro Ayres
dc.creatorCOSTA, Marcondes Lima da
dc.creatorPOELLMANN, Herbert
dc.creator.Latteshttp://lattes.cnpq.br/6368499132328060pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/1639498384851302pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/4178421482868762pt_BR
dc.date.accessioned2019-05-29T17:34:05Z
dc.date.available2019-05-29T17:34:05Z
dc.date.issued2018-09
dc.description.abstractBauxite deposits in the Amazon region are commonly covered by yellowish clays which can reach up to 25m thick, known as Belterra Clay (BTC). In Rondon do Pará, Eastern Amazon, BTC is 13m thick and covers world-class bauxite reserves. Three pilot bauxite mines were investigated in Rondon do Pará for an initial characterization of the local BTC. In discordant contact with the lateritic profile, the BTC has reddish brown colors at its base to ocher tones towards the top. It has a massive structure with silt-clayey texture and nodular bauxitic fragments at its base. Rietveld mineral quantification of the material attests that it is dominated by kaolinite, with goethite, gibbsite, hematite, anatase and residual quartz. The thermal behavior of the material also confirms its mineralogical composition. Kaolinite is of low structural order, which was considered the main difficulty in the application of the Rietveld method. Goethite has up to 33 mol% of Al. As observed by scanning electron microscopy (SEM), the minerals represent pseudo-hexagonal crystals measuring from 150 to 700 nm. The BTC in the studied area is correlated to BTC on others bauxitic deposits of the Amazon region, suggesting this material experienced the same genesis and geological evolution, probably during the Pliocene.pt_BR
dc.description.affiliationNEGRÃO, L. B. A; COSTA, M. L. Universidade Federal do Parápt_BR
dc.description.sponsorshipPETROBRAS
dc.identifier.citationNEGRÃO, Leonardo Boiadeiro Ayres, COSTA, Marcondes Lima da, POLLMANN, Herbert. The Belterra Clay On The Bauxite Deposits Of Rondon Do Pará, Eastern Amazon. Brazilian Journal of Geology, São Paulo, jul./set.2018. v. 48, n. 3, p. 473-484, jul./set. 2018. DOI: http://dx.doi.org/10.1590/2317-4889201820180128. Disponível em: http://repositorio.ufpa.br/jspui/handle/2011/11223. Acesso em:.pt_BR
dc.identifier.doihttp://dx.doi.org/10.1590/2317-4889201820180128 pt_BR
dc.identifier.issn2317-4692pt_BR
dc.identifier.urihttps://repositorio.ufpa.br/handle/2011/11223
dc.languageengpt_BR
dc.publisherSociedade Brasileira de Geologiapt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.initialsSBGpt_BR
dc.relation.ispartofBrazilian Journal of Geologypt_BR
dc.rightsAcesso Abertopt_BR
dc.source.urihttp://ref.scielo.org/hpzngvpt_BR
dc.subjectBauxiteen
dc.subjectMineralogyen
dc.subjectKaoliniteen
dc.subjectAl-Goethiteen
dc.subjectRietvelden
dc.subjectChemistryen
dc.titleThe Belterra Clay On The Bauxite Deposits Of Rondon Do Pará, Eastern Amazonpt_BR
dc.title.alternativeThe Belterra Clay On The Bauxite Deposits Of Rondon Do Pará, Eastern Amazonpt_BR
dc.typeArtigo de Periódicopt_BR
dcterms.citation.epage484pt_BR

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