Abstract:RESUMO. Os Complexos máficos-ultramáficos Cana Brava (CCB), Niquelândia (CNQ) e Barro Alto (CBA) com suas seqüências vulcano-sedimentares de Palmeirópolis (SVSP), Indaianópolis (SVSI) e Juscelândia (SVSJ) a eles associadas, localizam-se na região centro-norte de Goiás, divisa com Tocantins, dentro da Província Tocantins, entre os Crátons Amazônico e o São Francisco. A anomalia Bouguer positiva segue a forma alongada dos complexos e não apresenta anomalias internas que permitam separar as principais unidades li… Show more
“…The idea of a single body was later reproposed based on geophysical and gravimetric data (Carminatti et al, 2006).…”
Section: Accepted Manuscriptmentioning
confidence: 99%
“…Barro Alto, Niquelândia and Cana Brava are three mafic-ultramafic layered complexes, which outcrop in a 350 km NNE trend alignment within the Brasilia Belt in the northern Goiás (central Brazil). They share several field, stratigraphic, geochemical and geochronological features that led to their interpretation as a cogenetic and coeval large intrusion (Ferreira Filho et al, 1998;Carminatti, 2006;Giovanardi et al, 2016). In contrast, several authors claim that Barro Alto and Niquelândia were both formed by two different intrusive events (a Meso-and a Neo-Proterozoic intrusion, with Cana Brava belonging to the Neoproterozoic event; Pimentel et al, 2004Pimentel et al, , 2006Ferreira Filho et al, 2010;Della Giustina et al, 2011).…”
The Cana Brava, Niquelândia and Barro Alto complexes (Goiás, central Brazil) are three of the largest mafic-ultramafic layered complexes in the world and their origin has been a matter of debate for several decades. One hypothesis suggests that Niquelândia and Barro Alto were both formed by two distinct igneous events at 1.3 Ga and at 790Ma and were later overlapped during tectonic exhumation at 650 Ma; according to this reconstruction Cana Brava belongs to the youngest intrusion at 790 Ma. A second hypothesis suggests that the three complexes formed during the same event. Here we provide new U-Pb SHRIMP-II zircon ages for the Cana Brava and Barro Alto complexes, constraining their intrusion age to the Neoproterozoic (between 770 and 800 Ma), coeval with Niquelândia. A review of new and literature ages indicate that these complexes formed during a single igneous event andwere notmodified by regional metamorphism.We propose that the complexes represent fragments of the larger Tonian Goiás Stratiform Complex, which was likely part of a back-arc environment connected to the formation of the GoiásMagmatic Arc at about 790Ma, later disrupted and accreted to the São Francisco craton
“…The idea of a single body was later reproposed based on geophysical and gravimetric data (Carminatti et al, 2006).…”
Section: Accepted Manuscriptmentioning
confidence: 99%
“…Barro Alto, Niquelândia and Cana Brava are three mafic-ultramafic layered complexes, which outcrop in a 350 km NNE trend alignment within the Brasilia Belt in the northern Goiás (central Brazil). They share several field, stratigraphic, geochemical and geochronological features that led to their interpretation as a cogenetic and coeval large intrusion (Ferreira Filho et al, 1998;Carminatti, 2006;Giovanardi et al, 2016). In contrast, several authors claim that Barro Alto and Niquelândia were both formed by two different intrusive events (a Meso-and a Neo-Proterozoic intrusion, with Cana Brava belonging to the Neoproterozoic event; Pimentel et al, 2004Pimentel et al, , 2006Ferreira Filho et al, 2010;Della Giustina et al, 2011).…”
The Cana Brava, Niquelândia and Barro Alto complexes (Goiás, central Brazil) are three of the largest mafic-ultramafic layered complexes in the world and their origin has been a matter of debate for several decades. One hypothesis suggests that Niquelândia and Barro Alto were both formed by two distinct igneous events at 1.3 Ga and at 790Ma and were later overlapped during tectonic exhumation at 650 Ma; according to this reconstruction Cana Brava belongs to the youngest intrusion at 790 Ma. A second hypothesis suggests that the three complexes formed during the same event. Here we provide new U-Pb SHRIMP-II zircon ages for the Cana Brava and Barro Alto complexes, constraining their intrusion age to the Neoproterozoic (between 770 and 800 Ma), coeval with Niquelândia. A review of new and literature ages indicate that these complexes formed during a single igneous event andwere notmodified by regional metamorphism.We propose that the complexes represent fragments of the larger Tonian Goiás Stratiform Complex, which was likely part of a back-arc environment connected to the formation of the GoiásMagmatic Arc at about 790Ma, later disrupted and accreted to the São Francisco craton
“…A densidade modelada é de 2,90 g/ cm 3 , para corpo com cerca de 0,9 km de profundidade. Amostras do complexo máfico-ultramáfico de Cana Brava apresentam densidade média de 3,02 g/cm 3 e a seqüência vulcanossedimentar de Palmeirópolis de 2,94 g/cm 3 (Carminatti 2006). Considerando que o perfil gravimétrico utilizou pontos de amostragem localizados a sul do complexo e da seqüência, o valor modelado de 2,90 g/cm 3 mostra-se compatível com a média de densidades das rochas da área.…”
Section: Figura 4 -Traços De Função Do Receptor Da Estação Ret9 Empilunclassified
“…The second hypothesis indicates that in the Mesoproterozoic, the Goiás Massif constituted the western border of the São Francisco paleocontinent, which was strongly affected by a series of events during the Neoproterozoic period. This proposal was suggested by Fuck (1994), Pereira and Fuck (2005), Soares et al, (2006), Carminatti (2006), Martins-Neto (2007), D'el-Rey Silva et al, (2008), Ventura et al, (2011), Brito Neves and Fuck (2013), Fuck et al, (2014.…”
Contents of this paper were reviewed by the Technical Committee of the 16 th International Congress of the Brazilian Geophysical Society and do not necessarily represent any position of the SBGf, its officers or members. Electronic reproduction or storage of any part of this paper for commercial purposes without the written consent of the Brazilian Geophysical Society is prohibited.
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