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• W1995608652 abstract "The southern São Francisco Craton, northeastern Brazil, consists of an Archean block surrounded by a Paleoproterozoic belt related to the Transamazonian Orogeny (ca. 2.0 Ga). A calc-alkaline plutonic arc developed within the belt and the granitoid plutons comprise two distinct groups. One group displays Archean TDM ages (3.07–2.62 Ga), εNd(t) values between −11.0 and −3.8 and high initial 87Sr/86Sr values, and it consists mainly of peraluminous granites. TDM ages for the other group are Paleoproterozoic (2.43–2.27 Ga), and εNd(t) values range between −2.8 and +1.3; the plutons are metaluminous tonalites (trondhjemites) to granodiorites. The Transamazonian granitoids can be related to contrasting source-regions, from mantle- to crust-derived ones. A number of them are probably derived from mixing of Paleoproterozoic juvenile material and variable proportions of Archean crust material. Magmatism related to deep faulting, during the compressional stages of the Transamazonian Orogeny, is a plausible model for granitoid generation. The contribution of mantle-derived material to the granitoid sources supports the idea that a significant episode of new crust formation occurred during the Transamazonian Orogeny. A porção meridional do Cráton do São Francisco consiste de um núcleo arqueano parcialmente circundado por um cinturão paleoproterozóico, relacionado à Orogênese Transamazônica (ca. 2,0 Ga). Um arco plutônico de natureza cálcio-alcalina desenvolveu-se neste cinturão, incluindo dois grupos de plutons granitóides. Um grupo, essencialmente composto por granitos peraluminosos, exibe idades TDM arqueanas (3,07–2,62 Ga), valores de εNd(t) entre −11,0 e −3.8 e altas razões iniciais de 87Sr/86Sr. Para o outro grupo, que inclui tonalitos (trondhjemitos) e granodioritos de caráter metaluminoso, as idades TDM são Paleoproterozóicas (2,43–2,27 Ga) e os valores de εNd(t) variam entre −2.8 e +1.3. Os granitóides Transamazônicos podem ser relacionados a áreas-fonte distintas, de derivação mantélica a crustal. Alguns plutons parecem ser produtos de mistura entre material juvenil paleoproterozóico e diferentes proporções de material crustal arqueano. Sugere-se um modelo de granitogênese ligada a falhamentos profundos, no contexto da fase compressiva da Orogênese Transamazônica. A indicação de contribuição mantélica para os plutons estudados reforça a hipótese de que a Orogênese Transamazônica representou um importante episódio de geração de crosta continental." @default.
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• W1995608652 date "2000-07-01" @default.
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• W1995608652 title "Isotopic signatures of Paleoproterozoic granitoids from the southern São Francisco Craton and implications for the evolution of the Transamazonian Orogeny" @default.
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• W1995608652 doi "https://doi.org/10.1016/s0895-9811(00)00019-5" @default.
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