Isotopic signatures of Paleoproterozoic granitoids from the southern São Francisco Craton and implications for the evolution of the Transamazonian Orogeny

Chemostratigraphy of the lower Bambuí Group, southwestern São Francisco Craton, Brazil: insights on Gondwana paleoenvironments

“…The basement of the southern São Francisco Craton consists of an Archean block surrounded to the south by a late Rhyacian orogenic belt (Noce et al 2000(Noce et al , 2007. In Arcos region, the basement comprises orthogneisses, amphibolites and meta-ultramafic rocks, with minor schists and quartzites, intruded by gabbronorites, granitoids and gabbros (Fernandes & Carneiro 2000, Oliveira & Carneiro 2001.…”

Orosirian (ca. 1.96 Ga) mafic crust of the northwestern São Francisco Craton margin: Petrography, geochemistry and geochronology of amphibolites from the Rio Preto fold belt basement, NE Brazil

“…In South America, a Rhyacian tectono-magmatic event is ubiquitous, with extensive calc-alkaline magmatism in between 2.2 and 2.15 Ga and granulite facies metamorphism at around 2.06 Ga (Alkmim and Marshak, 1998;Noce et al, 2000;Teixeira et al, 2000;Cordani et al, 2000;Hartmann, 2001;Alkmim, 2004;Barbosa and Sabat e, 2004). Remnants of these orogenic events are found within all three major cratons of Brazil (Rio de La Plata, Amazonian and São Francisco), as well as within the basement of the Brasiliano fold belts that surround the cratons ( Fig.…”

Sr–Nd constraints and trace-elements geochemistry of selected Paleo and Mesoproterozoic mafic dikes and related intrusions from the South American Platform: Insights into their mantle sources and geodynamic implications

“…Its evolution involved a 2.5e2.0 Ga old passive margin to foreland strata, distinct metavolcanic-sedimentary sequences (from 2.3 to 2.2 Ga), and a large volume of granitoid rocks produced by successive, mostly juvenile, magmatic arcs (2.36e2.00 Ga), which eventually coalesced to the Neoarchean foreland (e.g., Noce et al, 2000Noce et al, , 2007 Alkmim and Noce, 2006;Ávila et al, 2010). According to Marshak et al (1992), the coalescence stage produced complex deformation and superposition of several tectonic episodes, which resulted in crustal extension of the dome-and-keel structures in the Mineiro belt, and were accompanied by contact metamorphism dated at 2.10e2.04 Ga.…”