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

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Author	FISCHEL DANIELLE P. PIMENTEL MÁRCIO M. FUCK REINHARDT A. ARMSTRONG RICHARD
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 epsilonNd(T) = +3.0 interpreted as a juvenile magmatic event. Nd isotopic analyses on samples from the Jurubatuba Granite have Paleoproterozoic T DM model ages between 2.30 and 2.42 Ga and epsilonNd(T) values vary between -0.22 and -0.58. The oldest T DM 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.
Related Links	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300012
ISSN	00013765
e-ISSN	16782690
Journal	Anais da Academia Brasileira de Ciências
Issue Number	3
Volume Number	73
Language	English
Publisher	Academia Brasileira de Ciências
Publisher Date	2001-01-01
Publisher Place	Brazil
Access Restriction	Open
Subject Keyword	Science U-pb Shrimp Sm-nd Isotopic Data Brasília Belt Basement Rocks
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary