Crustal evolution between 2.0 and 3.5 Ga in the southern Gavião block (Umburanas-Brumado-Aracatu region), São Francisco Craton, Brazil: A 3.5–3.8 Ga proto-crust in the Gavião block?

Paleoarchean record of the detrital pyrite-bearing, Jacobina Au–U deposits, Bahia, Brazil

“…The TTG belongs to segments of the older crust of South America, ranging in age between 3.4 and 3.0 Ga, and recycled 2.7-Ga granitoids (Nutman and Cordani, 1993;Barbosa and Sabaté, 2004;SantosPinto et al, 2012) and Nd model age between 2.9 and 3.7 Ga (Barbosa and Sabaté, 2002;Santos-Pinto et al, 2012). The associated greenstone belts, such as the Mundo Novo Greenstone Belt (MNGB) ( Fig.…”

“…1). The Paleoproterozoic Itabuna-Salvador-Curaç á belt is composed of rocks metamorphosed at amphibolite-to granulite-facies conditions, Modified after Barbosa and Sabaté (2004) and Santos-Pinto et al (2012). Pearson et al, 2005).…”

Petrography, geochemistry and geochronology of the potassic granitoids of the Rio Itacambiruçu Supersuite: implications for the Meso- to Neoarchean evolution of the Itacambira-Monte Azul block

“…Neoarchean potassic granitoids with ages between 2.75 Ga and 2.6 Ga produced by crustal reworking are common in the Gavião block, which is located to the north of the BIMA, as well as in the southern São Francisco craton ( Fig. 1C; Cruz et al 2012, Santos-Pinto et al 2012, Farina et al 2015, Moreno et al 2017. Consequently, ca.…”

Field and geochronological evidence for origin of the Contendas-Mirante supracrustal Belt, São Francisco Craton, Brazil, as a Paleoproterozoic foreland basin

“…In summary, the detrital zircon grains of age intervals 2080-2190 Ma and 2500-2770 Ma observed in metasedimentary rocks of the CMB were most likely eroded away from the ISCO and the Archean basement involved within the orogeny. Alternative sources for these age intervals are also found in the western margin of São Francisco craton (Fuck et al, 2014;Cordeiro et al, 2014;Sousa et al, 2016) and in the Gavião Block, including the 2720-2680 Ma alkaline Caraguataí and Serra do Eixo gneisses (Cruz et al, 2011;Santos-Pinto et al, 2012) and intrusive granites of 2140-2030 Ma (Cruz et al, 2016 and references therein). However, the small number of zircon grains older than 3300 Ma, the absence of rocks crystalized between 2680 and 2550 Ma and the low abundance of > 2140 Ma Paleoproterozoic granitic rocks indicate that the Gavião Block and rocks from the western domains of the São Francisco craton are not the main favorable sources of clasts.…”