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, central Brazil
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)...[Show more]
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|Source:||Anais da Academia Brasileira de Ciencias|
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