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• W3011763399 abstract "Abstract We report new whole-rock Nd and Sr isotope data for two strongly peraluminous and one slightly peraluminous Carboniferous A-type granitic plutons in the eastern Sierras Pampeanas of Argentina. Our study also integrates previous petrological and geochemical information with in situ U–Pb and Hf isotope data from magmatic and inherited zircon. Strongly peraluminous samples have pronounced negative eNdt values (−7.6 and −7.0) and very high (87Sr/86Sr)t values (0.728778 and 0.747092). These are similar to isotope compositions reported for the Puncoviscan Series, a metasedimentary sequence metamorphosed during the Lower Cambrian and intruded by these granites. Nd and Sr isotope data for the slightly peraluminous sample (eNdt = −3.5 and 87Sr/86Srt = 0.708074), together with previously reported petrological and geochemical data, indicate that the basement of the Sierras de Cordoba participated in the generation of the parental magma. The new data are not easily reconciled with the positive zircon eHft values previously reported for these samples, which suggest dominantly juvenile material in the source. We propose that Hf was transferred from inherited zircon toward the magmatic rim, without complete isotopic homogenization with the magma, as has been hypothesized in previous works. Our results reveal that the indiscriminate use of Hf databases can lead to false inference of crustal growth by mantle addition through time and misleading comparisons between granitic rocks worldwide." @default.
• W3011763399 created "2020-03-23" @default.
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• W3011763399 date "2020-06-01" @default.
• W3011763399 modified "2023-10-09" @default.
• W3011763399 title "A combined zircon Hf isotope and whole-rock Nd and Sr isotopes study of Carboniferous A-type granites, Sierras Pampeanas of Argentina" @default.
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• W3011763399 doi "https://doi.org/10.1016/j.jsames.2020.102545" @default.
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