“…Another critical point that was not assessed by the authors is the record of three metamorphic episodes in the Ribeira belt (Heilbron et al, 2017 and references therein): 620-595 Ma-accretion of the inner continental magmatic arc; 595-565 Ma-accretion of intraoceanic magmatic arcs; and 535-510 Ma-collision of the Cabo Frio Terrane (continuation of Angola craton), completing the amalgamation of West Gondwana (Machado et al, 1996;Bento dos Santos et al, 2015;Degler et al, 2017;Duffles et al, 2016;Heilbron & Machado, 2003;Lobato et al, 2015;Machado et al, 1996;Schmitt et al, 2004;Vinagre et al, 2014). As summarized by Heilbron et al (2017, and references therein), the ages of these three metamorphic episodes are constrained by: lower intercepts of zircon U-Pb discordia of Paleoproterozoic basement rocks; U-Pb ages of metamorphic rims of zircons from basement and precollisional rocks; U-Pb and U-Pb-Th Electron Microprobe analysis of monazite, titanite, and rutile in orthogneisses and paragneisses; and U-Pb zircon ages of sin-collisional sensu stricto granites (Alves et al, 2013;Heilbron et al, 2017;Heilbron & Machado, 2003;Janasi et al, 2016;Lobato et al, 2015;Valladares et al, 2017, and references therein).…”