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- W2021805286 abstract "SHRIMP U–Pb zircon ages are reported from a sample of the Santana Granite that represents the beginning of alkaline magmatic activity in the Neoproterozoic of the Sul-Rio-Grandense Shield, Brazil. This granite outcrops in the city of Porto Alegre and has a NE–SW elongated shape (20 km long and 5 km wide). It is a medium- to coarse-grained syenogranitic rock with subvertical magmatic foliation and subhorizontal lineation with NE–SW trends, overprinted by a weak solid-state fabric. Zircons of this rock with 206Pb/238U ages between ca. 575 and ca. 617 Ma are interpreted as having formed during magmatic crystallisation; the best fit for this age using five analyses provided a mean 206Pb/238U age of 600±10 Ma. This age is also interpreted as the age of the reactivation of the Porto Alegre Suture, a crustal discontinuity along which the Santana Granite was emplaced. Younger isotopic data (<575 Ma) for zircons from this sample are interpreted as due to Pb loss from metamictization. The 600-Ma age is consistent with previous results and marks a magmatic episode, probably related to an extensional tectonic episode that affected the NE of the Sul-Rio-Grandense Shield at the end of the Brasiliano Cycle." @default.
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- W2021805286 date "2001-04-01" @default.
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- W2021805286 title "SHRIMP U–Pb age for the emplacement of the Santana Granite and reactivation of the Porto Alegre Suture, southern Brazil" @default.
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- W2021805286 doi "https://doi.org/10.1016/s0895-9811(01)00004-9" @default.
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