Constraining timing and P-T conditions of continental collision and late overprinting in the Southern Brasília Orogen (SE-Brazil): U-Pb zircon ages and geothermobarometry of the Andrelândia Nappe System

Metamorphic modeling and petrochronology of metapelitic rocks from the Luminárias Nappe, southern Brasília belt (SE Brazil)

“…An alternative interpretation is that the area faced two metamorphic events, an older one at ca. 632-615 Ma, related to the collision of the southern Brasília belt, and a younger one at about 600 Ma related to collision of the Ribeira belt, as proposed in literature (Trouw et al 2013b, Coelho et al 2017, Reno et al 2012, Peternel et al 2005, Vinagre et al 2016.…”

“…The Brasília belt is in contact with the Neoproterozoic Ribeira belt on its southeastern border (Hasui et al 1975. Contrasting interpretations of this region were presented in literature, as it is either described as an interference zone between the Brasília and Ribeira belts, due to superposition of structures and metamorphism related to collision in both belts (Peternel et al 2005, 2013b, Heilbron et al 2008, Coelho et al 2017, or it is considered as formed exclusively due to metamorphism and deformation associated with the Brasília Orogeny (Campos Neto 2000, Westin et al 2016.…”

“…Neoproterozoic ages of metamorphism, peak and retrograde, from whole southern Brasília belt vary, from 670 to 590 Ma (Vlach & Gualda 2000, Valeriano et al 2004, Campos Neto et al 2007, Campos Neto et al 2010, Reno et al 2010, Westin et al 2016, Coelho et al 2017, Rocha et al 2017, Tedeschi et al 2017. Monazite ages obtained with laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) from the Carrancas Klippe rocks (northeast of the Luminárias Nappe) are ca.…”

“…This passive margin was metamorphosed during the Ediacaran-Cambrian orogenesis, which led to the agglutination of West Gondwana (Dardenne 2000, Fuck et al 2017, Heilbron et al 2017. There are controversial interpretations regarding the tectonic evolution of the Luminárias Nappe, that is, either in a single tectonic episode related to the formation of the southern Brasília belt (Campos Neto 2000, Westin et al 2016 or as part of the interference zone between the southern Brasília and Central Ribeira belts (Peternel et al 2005, 2013b, Heilbron et al 2008, Coelho et al 2017.…”

Sedimentary provenance in the southern sector of the São Francisco Basin, SE Brazil

“…Exposed rocks that could potentially be sources of sediments dated at ca. 560 Ma are described in the Southern Brasília Orogen (Coelho et al 2017) and the Ribeira Belt and they go to the south of the São Francisco craton, so that they may also have contributed to the basin filling.…”