Titre:	U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite : juvenile paleoproterozoic crust in the basement of the neoproterozoic Brasília belt, Goiás, central Brazil
Auteur(s):	Fischel, Danielle Piuzana Pimentel, Márcio Martins Fuck, Reinhardt Adolfo Armstrong, Richard
Assunto::	Rochas Geocronologia Granito
Date de publication:	sep-2001
Editeur:	Academia Brasileira de Ciências
Référence bibliographique:	FISCHEL, Danielle Piuzana et al. U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt, Goiás, central Brazil. Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 73, n. 3, p. 445-460, set. 2001. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300012&lng=en&nrm=iso>. Acesso em: 02 jun. 2016. http://dx.doi.org/10.1590/S0001-37652001000300012.
Abstract:	U-Pb SHRIMP and Sm-Nd isotopic ages were determined for felsic metavolcanic rocks from the Silvânia Sequence and Jurubatuba Granite in the central part of the Brasília Belt. Zircon grains from a metavolcanic sample yielded 2115 ± 23 Ma and from the granite yielded 2089 ± 14 Ma, interpreted as crystallization ages of these rocks. Six metavolcanic samples of the Silvânia Sequence yielded a six-point whole-rock Sm-Nd isochron indicating a crystallization age of 2262 ± 110 Ma and positive eNd(T) = +3.0 interpreted as a juvenile magmatic event. Nd isotopic analyses on samples from the Jurubatuba Granite have Paleoproterozoic TDM model ages between 2.30 and 2.42 Ga and eNd(T) values vary between -0.22 and -0.58. The oldest TDM value refers to a sedimentary xenolith in the granite. These results suggest crystallization ages of Silvânia volcanics and Jurubatuba Granite are the first evidence of a ca. 2.14-2.08 juvenile magmatic event in the basement of the central part of the Brasília Belt that implies the presence of arc/suture hidden in reworked basement of the Brasília Belt.
Licença::	Anais 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=S0001-37652001000300012&lng=en&nrm=iso&tlng=en. Acesso em: 02 jun. 2016.
DOI:	http://dx.doi.org/10.1590/S0001-37652001000300012
Collection(s) :	Artigos publicados em periódicos e afins

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