The link between partial melting, granitization and granulite development in central Ribeira Fold Belt, SE Brazil: New evidence from elemental and Sr–Nd isotopic geochemistry

Diachronic collision, slab break-off and long-term high thermal flux in the Brasiliano–Pan-African orogeny: Implications for the geodynamic evolution of the Mantiqueira Province

“…It showed an overall evolution from: (a) a pre-collision calc-alkaline magmatic arc event, with abundant calc-alkaline and metaluminous granitoid production; to (b) a syn-orogenic and main metamorphic event, with abundant peraluminous granitoid emplacement and formation of high-temperature metamorphic rocks consistent with the establishment of the metamorphic peak; to (c) a post-orogenic event with metaluminous plutonism. This overall trend is perfectly compatible with the data obtained by Bento dos Santos et al (2010Santos et al ( , 2011aSantos et al ( , 2012 in the central-north MP that, based on the geochemistry of the granitoids and metamorphic rocks, constrained the pre-orogenic, syn-orogenic and post-orogenic magmatic events at ∼610-590 Ma, ∼575-560 Ma and ∼520-480 Ma, respectively (Table 1; Fig. 7).…”

“…Thermal upwelling in the resultant slab window and magma underplating beneath the crust (Henk et al, 1997;Chen et al, 2015) could provide both the crustal thermal anomaly (with geothermal gradients as high as 45-60 • C/km; e.g. : Bento dos Santos et al, 2011b; Philipp et al, 2013), capable of leading to widespread granulitization in large sections of the middle/low-crust (Bento dos Santos et al, 2010Santos et al, , 2011a and the observed geochemical evolution of the long-lived magmatic sequences, in some cases for more than 100 Ma. Minor production of crust-mantle hybridized granitoids (e.g.…”

Characterization of Nd Radiogenic Isotope Signatures in Sediments From the Southwestern Atlantic Margin

“…The geological setting of the Ribeira belt is divided in 13 geotectonic domains: Embú, Paraíba do Sul, Juíz de Fora, Rio Negro Magmatic Arc, Cabo Frio, Apiaí, Curitiba, Paranaguá, Iguape, Registro, Mongaguá-Itanhaém, and Coastal, which includes metasediments of the Coastal domains of São Paulo and São Fidélis (Figure 1) (Siga, 1995;Campanha and Sadowski, 1999;Heilbron et al, 2004;Valladares et al, 2008;Bento dos Santos et al, 2011;Dias Neto, 2001;Passarelli et al, 2004). The Paraná basin, located in the SW portion of the South America (Figure 1), is characterized as an intracratonic basin constituted by sedimentary sequences (e.g., Milani et al, 1996) and volcanic rocks from the PMP (Marques et al, 1999).…”

The Ediacaran Rio Doce magmatic arc revisited (Araçuaí-Ribeira orogenic system, SE Brazil)

“…This article is an important landmark for the characterization of the Rio Doce arc as the "tonalitic series" really includes precollisional plutons of the G1 supersuite, like Muniz Freire and Serra da Bolívia (De Campos et al, 2004;Pedrosa-Soares et al, 2011;Heilbron et al, 2013; and the present paper). However, the "enderbitic series" of Figueiredo and Campos Neto (1993) corresponds, in fact, to the peraluminous magmatism formed from the partial melting of metasedimentary gneisses (Sluitner and Weber-Diefenbach, 1989;S€ ollner et al, 1989;De Campos et al, 2004;Bento dos Santos et al, 2011;Gradim et al, 2014). Since then, the concept of Rio Doce arc has been used in distinct senses or even neglected possibly due to its relation to the controversial "Rio Doce orogeny" (Campos-Neto and Figueiredo, 1995).…”