Proveniência e idade do metamorfismo das rochas da Faixa Brasília, na Região de Tapira (SW de Minas Gerais)

The Vazante and Canastra groups revisited: Sm-Nd and Sr isotopes - evidence for contribution from Tonian intraplate magmatism during passive margin development along the SW São Francisco margin, Brazil

“…The 38 new isotope data for Vazante and Canastra groups' samples were integrated with previously available data for the same units in Figure 4 , Silva et al 2006, Rodrigues 2008, Santana 2011, Rodrigues et al 2012. Vazante and Canastra groups show a range of model ages very similar with highly negative εNd.…”

“…The Vazante and Canastra group samples scatter around a 2.00 Ga reference line, interpreted here as a mixing line of old cratonic sources, which scatter along the 2.70 Ga reference isochron and Tonian Figure 5. T DM histograms for the metasedimentary rocks from Vazante and Canastra groups (n = 100, Pimentel et al 2001, Silva et al 2006, Rodrigues 2008, Santana 2011, Rodrigues et al 2012, Carvalho 2015, along with data from the basement (n = 191, Teixeira 1985, Sato 1998 and Tonian anorogenic magmatic rocks (n = 39, Tack et al 2001, Correa-Gomes & Oliveira 2002, Chaves & Neves 2005, Rosa et al 2005, Girardi et al 2013, Salgado et al 2016 anorogenic metabasic rocks along the 1.00 Ga reference isochron. Reference isochron would indicate ages between 2.00 and 1.00 Ga for both Vazante and Canastra groups.…”

“…The Brasiliano orogeny, in the Southern Brasilia belt, started at ~0.64 Ga, with subduction of the distal continental margin and fore-arc successions, represented by the Ibiá Group and the upper part of the Araxá Group (Seer & Dardenne 2000, Piuzana et al 2003, Valeriano et al 2004a, 2004b, Silva et al 2006, Falci et al 2018. The collisional phase involved the accretion of microcontinents such as the Paranapanema block (Mantovani et al 2005) and the Goías Massif ( Jost et al 2005), and of the Mara Rosa, Arenópolis and Goiás magmatic arcs.…”

“…In the last decades, the stratigraphy and sedimentary provenance patterns of the Neoproterozoic metasedimentary units along the former western margin of the São Francisco paleocontinent have been investigated with the intensive use of whole-rock Nd isotopes , Silva et al 2006, Rodrigues 2008, Santana 2011) and of U-Pb ages of detrital zircons (Piuzana et al 2003, Valeriano et al 2004a, 2004b, Pimentel et al 2011, Dias et al 2011, Rodrigues et al 2012, Falci et al 2018. These studies have established that some units, such as the Paranoá, Vazante, and Canastra groups, as well as the lower part of the Araxá Group, developed along the passive margin of the São Francisco Craton, The Vazante and Canastra groups revisited: Sm-Nd and Sr isotopes -evidence for contribution from Tonian intraplate magmatism during passive margin development along the SW São Francisco margin, Brazil Supplementary material Supplementary data associated with this article can be found in the online version: Supplementary Table A. with youngest detrital zircons ages around 0.90 Ga.…”

Campo gravimétrico do complexo alcalino de tapira (mg): Comparação entre técnicas de interpolação e de separação regional-residual

“…O Complexo Alcalino de Tapira intrude nas rochas do Cinturão Móvel Brasília, de idade Neoproterozóica, adjacente ao Cráton do São Francisco. Segundo Silva et al (2006), a Faixa Brasília na região de Tapira, exibe um conjunto de três escamas, com características litológicas distintas delimitadas por falhas de cavalgamento sobre o Grupo Bambuí (Fig. 1).…”