Publicação:
40Ar/39Ar geochronological evidence for multiple magmatic events during the emplacement of Tapira alkaline-carbonatite complex, Minas Gerais, Brazil

dc.contributor.authorConceição, Fabiano T. [UNESP]
dc.contributor.authorVasconcelos, Paulo M.
dc.contributor.authorGodoy, Letícia H. [UNESP]
dc.contributor.authorNavarro, Guillermo R.B. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionSchool of Earth Science
dc.date.accessioned2020-12-12T01:05:55Z
dc.date.available2020-12-12T01:05:55Z
dc.date.issued2020-01-01
dc.description.abstractThe Alto Parnaíba Igneous Province (APIP) is a voluminous magmatic province composed of various alkaline-carbonatite complexes emplaced in the Brasilia Mobile Belt during the Cretaceous. Relative timing of emplacement of silicate and carbonate magmas in most of these complexes remains mostly unresolved due to conflicting geochronological results. To determine the duration of magmatism and to test the possible existence of multiple magmatic events, we employ 40Ar/39Ar phlogopite single crystal dating to determine the history of magma emplacement at the Tapira alkaline-carbonatite complex, Minas Gerais, Brazil. The new single crystal data indicate at least two magmatic events during the emplacement of this complex, the first at > 96.2 ± 0.8 Ma and the second at 79.15 ± 0.6 Ma. The first igneous event was responsible for emplacement of the silicate plutonic series, while the second event corresponds to the emplacement of primarily carbonatitic magmas, generating metasomatic phlogopite alteration in bebedourites. The ages of intrusion and cooling of the alkaline-carbonatite complexes in the APIP must be investigated in other complexes to determine if intrusion intervals of ~17 Ma or more are common regionally. Protracted intrusive events, if related to magma generation by passage of South America over a stationary Trindade plume, requires complex ponding and lateral magma flow below a slow-moving continent.en
dc.description.affiliationUNESP - Universidade Estadual Paulista Instituto de Geociências e Ciências Exatas
dc.description.affiliationUniversity of Queensland School of Earth Science
dc.description.affiliationUnespUNESP - Universidade Estadual Paulista Instituto de Geociências e Ciências Exatas
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipUniversity of Queensland
dc.description.sponsorshipIdFAPESP: 2005/59203-1
dc.description.sponsorshipIdCNPq: 200775/2008-1
dc.identifierhttp://dx.doi.org/10.1016/j.jsames.2019.102416
dc.identifier.citationJournal of South American Earth Sciences, v. 97.
dc.identifier.doi10.1016/j.jsames.2019.102416
dc.identifier.issn0895-9811
dc.identifier.scopus2-s2.0-85075403763
dc.identifier.urihttp://hdl.handle.net/11449/198184
dc.language.isoeng
dc.relation.ispartofJournal of South American Earth Sciences
dc.sourceScopus
dc.subject40Ar/39Ar geochronology
dc.subjectalkaline-carbonatite rocks
dc.subjectAPIP emplacement
dc.subjectBrazil
dc.title40Ar/39Ar geochronological evidence for multiple magmatic events during the emplacement of Tapira alkaline-carbonatite complex, Minas Gerais, Brazilen
dc.typeArtigo
dspace.entity.typePublication

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