Shrimp and conventional U-Pb age, Sm-Nd isotopic characteristics and tectonic significance of the K-rich Itapuranga suite in Goiás, Central Brazil

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorPimentel, Márcio Martins-
Autor(es): dc.creatorDantas, Elton Luiz-
Autor(es): dc.creatorFuck, Reinhardt Adolfo-
Autor(es): dc.creatorArmstrong, Richard-
Data de aceite: dc.date.accessioned2021-10-14T18:10:10Z-
Data de disponibilização: dc.date.available2021-10-14T18:10:10Z-
Data de envio: dc.date.issued2017-02-14-
Data de envio: dc.date.issued2017-02-14-
Data de envio: dc.date.issued2003-03-
Fonte completa do material: dc.identifierhttp://repositorio.unb.br/handle/10482/22505-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1590/S0001-37652003000100011-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/625138-
Descrição: dc.descriptionThe Itapuranga alkali granite and Uruana quartz syenite are large K-rich EW-elongated intrusions, in the central part of the Neoproterozoic Brasília Belt, central Brazil. They are associated with Pireneus lineaments, which cut the regional NNW-SSE structures of the southern part of the belt. SHRIMP and conventional U-Pb data for the Itapuranga and Uruana intrusions indicate crystallization ages of 624 ± 10 Ma and 618 ± 4 Ma, respectively. Three zircon cores from the Itapuranga granite yielded U-Pb ages between 1.79 and 1.49 Ga. Sm-Nd TDM ages for both intrusions are 1.44 Ga and eNd(T) values are -5.1 and -5.7, suggesting the input of material derived from older (Paleo- to Mesoproterozoic) sialic crust in the origin of the parental magmas. Magma mixing structures indicate co-existence of mafic and felsic end-members. The felsic end-member of the intrusions is dominantly represented by crust-derived melts, formed in response to the invasion of Paleo/Mesoproterozoic sialic crust by alkali-rich mafic magmas at ca. 620 Ma. These intrusions are roughly contemporaneous with, or perhaps slightly younger than, the peak of regional metamorphism in the southern Brasília Belt. Their emplacement along the Pireneus lineament suggest a syn-tectonic origin for them, most probably in transtensional settings along these faults.-
Formato: dc.formatapplication/pdf-
Publicador: dc.publisherAcademia Brasileira de Ciências-
Direitos: dc.rightsAcesso Aberto-
Direitos: dc.rightsAnais da Academia Brasileira de Ciências - All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License (Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)). Fonte: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100011&lng=en&nrm=iso&tlng=en. Acesso em: 02 jun. 2016.-
Palavras-chave: dc.subjectRochas-
Palavras-chave: dc.subjectGranito-
Palavras-chave: dc.subjectQuartzo-
Título: dc.titleShrimp and conventional U-Pb age, Sm-Nd isotopic characteristics and tectonic significance of the K-rich Itapuranga suite in Goiás, Central Brazil-
Tipo de arquivo: dc.typelivro digital-
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