Cerro Porã Batholith: post-orogenic A-type granite from the Amoguijá Magmatic Arc – Rio Apa Terrane – South of the Amazonian Craton

Zircon U–Pb ages of rocks from the Rio Apa Cratonic Terrane (Mato Grosso do Sul, Brazil): New insights for its connection with the Amazonian Craton in pre-Gondwana times

“…In addition to Rodinia and Gondwana, the age (1950( -1750 and tectonic setting of magmatic events recorded in the RACT basement (Lacerda Filho et al, 2006;Cordani et al, 2010a;Brittes et al, 2013;Plens et al, 2013) make its evolutionary history potentially relevant to the reconstruction of the Columbia supercontinent (Meert, 2002;Rogers and Santosh, 2002;Zhao et al, 2002Zhao et al, , 2004Zhao et al, , 2011Roberts, 2012Roberts, , 2013Meert, 2014). However, this history has not been taken into account in recent Columbia reconstructions based on paleomagnetic data (Bispo-Santos et al, 2008, 2012, 2014a.…”

“…The fourth magmatic event (1780-1720 Ma) is represented by the whole Eastern Terrane and includes the Caracol Gneiss (1774 ± 26 Ma, Cordani et al, 2010a;1781 ± 7 and1753 ± 13 Ma, this work) and the Baia das Garças Suite (1754 ± 42 Ma; Cordani et al, 2010a), including the Cerro Porã Granite (1749 ± 45 Ma; Plens et al, 2013), the Santa Clarinha Orthogneiss (1750 ± 9; this work), the Sanga Bonita Granite (1721 ± 25; Cordani et al, 2010a) and the Espinilho Orthogneiss (1719 ± 11; this work). The latter three units present subduction-related high-K calc-alkaline signatures, suggesting a younger accretionary magmatic event, while the Caracol Gneiss and the Cerro Porã Granite are dominated by alkaline signatures of extensional settings.…”

“…1) is a composite terrane that is considered the southernmost exposed part of the Amazonian Craton in southwestern Brazil (Mato Grosso do Sul State) and northern Paraguay (Ruiz et al, 2005;Lacerda Filho et al, 2006;Cordani et al, 2009;Godoy et al, 2009;Cordani et al, 2010a;Manzano et al, 2012;Brittes et al, 2013;Manzano, 2013;Plens et al, 2013;Teixeira et al, 2013). Thus, its evolutionary history is relevant to the reconstruction of the Gondwana and Rodinia supercontinents.…”

“…Geochronological and geological data suggest that the RACT comprises a fragment of an Orosirian to Statherian active continental margin that was subsequently deformed and metamorphosed in a 1310-1270 Ma collisional event (Lacerda Filho et al, 2006;Cordani et al, 2010a;Manzano et al, 2012;Brittes et al, 2013;Manzano, 2013;Plens et al, 2013;Pavan and Faleiros, 2014). 40 Ar-39 Ar data (muscovite and biotite) indicate that the RACT behaved as a cratonic mass after 1310-1270 Ma (Cordani et al, 2010a) and was unaffected by tectonothermal events related to the assembly of Rodinia (ca.…”

Petrologia e Geocronologia U-Pb (Shrimp) do Granito Coimbra – Registro do Arco Magmático Amoguijá na Região de Corumbá (MS)

“…O Batólito Cerro Porã, segundo Plens et al (2013), é compatível com granitos Tipo A2, da série alcalina potássica saturada em sílica, pós-tectônico, formado em torno de 1749 ± 45 Ma, conforme resultado U-Pb (SHRIMP) em zircão magmático. Nogueira (2015) descreve o Batólito Aquidabã como uma associação de rochas intrusivas (monzogranitos e granitos) e…”