Evidences of ion-adsorption clay-type rey enrichment in a weathered crust of the sÃo francisco granite (SÃo paulo, Brazil)

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Federal de Uberlândia (UFU)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorFaria Júnior, Ilio Rodarte-
Autor(es): dc.creatorLuvizotto, George Luiz [UNESP]-
Autor(es): dc.creatorRosolen, Vania Silvia [UNESP]-
Data de aceite: dc.date.accessioned2022-08-04T22:11:45Z-
Data de disponibilização: dc.date.available2022-08-04T22:11:45Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2021-08-06-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/222194-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/222194-
Descrição: dc.descriptionThe rare earth elements and yttrium (REY) ion-adsorption clay deposits (IAC) are important in the global supply chain of these metals, and originated by the weathering of biotite and/or muscovite syenogranite carrying REY weatherable minerals, with enrichment of REY occurring by adsorpotion in neoformed clay minerals, mainly kaolinite and halloysite. Evidences of REY IAC enrichment is reported, for the first time, in the 6,1 to 7,8-m-thick weathering profile on the São Francisco Granite (SFG-southeastern Brazil), a late-tectonic metaluminous to peraluminous greisenized syenogranite. Petrography and SEM/EDS analysis indicates that the parent rock, a peraluminous syenogranite, hosts REY-(fluor)carbonate minerals originated by alteration process. X-ray diffraction of the weathering profile, with soil and saprolite horizons, indicates the presence of neoformed kaolinite and halloysite. Chemical analysis of the weathered profile indicates REY content modification along the weathering horizons. The enrichment factor presents REY loss in horizons with positive cerium anomalies and a high chemical index of alteration (CIA>90) (soils and the saprolite of the P1 weathering profile). Meanwhile, REY gain was observed in saprolite horizon with negative cerium anomalies and lower chemical alteration index (CIA<90 and >70) (saprolite of the P3 weathering profile). Mass balance calculation demonstrates the REY mobility and mass gain in the weathering profile in similar conditions to the Asian REY-IAC deposits.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionUniversidade Federal de Uberlândia Instituto de Geografia, Km 1, Rodovia LMG-746-
Descrição: dc.descriptionUniversidade Estadual Paulista-UNESP Instituto de Geociências e Ciências Exatas, Av. 24A, 1515, Bela Vista-
Descrição: dc.descriptionUniversidade Estadual Paulista-UNESP Instituto de Geociências e Ciências Exatas, Av. 24A, 1515, Bela Vista-
Descrição: dc.descriptionCNPq: 141449/2017-9-
Formato: dc.format339-356-
Idioma: dc.languagept_BR-
Relação: dc.relationGeociencias-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectIon-exchangeable-
Palavras-chave: dc.subjectMass balance-
Palavras-chave: dc.subjectNeoformed clay minerals-
Palavras-chave: dc.subjectRare earth elements-
Palavras-chave: dc.subjectWeathering enrichment-
Título: dc.titleEvidences of ion-adsorption clay-type rey enrichment in a weathered crust of the sÃo francisco granite (SÃo paulo, Brazil)-
Título: dc.titleEvidências de enriquecimento de etr do tipo ion-adsorption clay no perfil de intemperismo do granito são francisco (São paulo, Brasil)-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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