| Campo DC | Valor | Idioma |
|---|
| dc.contributor.author | Fischel, Danielle Piuzana | - |
| dc.contributor.author | Pimentel, Márcio Martins | - |
| dc.contributor.author | Fuck, Reinhardt Adolfo | - |
| dc.contributor.author | Armstrong, Richard | - |
| dc.date.accessioned | 2017-02-14T10:50:30Z | - |
| dc.date.available | 2017-02-14T10:50:30Z | - |
| dc.date.issued | 2001-09 | - |
| dc.identifier.citation | 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. | en |
| dc.identifier.uri | http://repositorio.unb.br/handle/10482/22506 | - |
| dc.language.iso | Inglês | en |
| dc.publisher | Academia Brasileira de Ciências | en |
| dc.rights | Acesso Aberto | en |
| dc.title | 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 | en |
| dc.type | Artigo | en |
| dc.subject.keyword | Rochas | en |
| dc.subject.keyword | Geocronologia | en |
| dc.subject.keyword | Granito | en |
| dc.rights.license | 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. | en |
| dc.identifier.doi | http://dx.doi.org/10.1590/S0001-37652001000300012 | en |
| dc.description.abstract1 | 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. | en |
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