U-Pb LA-MC-ICPMS geochronology of Cambro-Ordovician post-collisional granites of the Ribeira belt, southeast Brazil: Terminal Brasiliano magmatism in central Gondwana supercontinent

Valeriano, Cláudio de Morisson; Tupinambá, Miguel; Simonetti, Antonio; Heilbron, Mônica; Almeida, Júlio; Eirado, Luiz Guilherme

doi:10.1016/j.jsames.2011.03.003

Cited by 58 publications

(42 citation statements)

References 20 publications

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“…Post-collisional granitoids were found at not only the Araçuaí Orogen, but also southwards from this orogen at the Ribeira Belt, which were interpreted by Valeriano et al (2011) as being associated with the orogenic collapse during the Cambrian. Thus, considering the Ar-Ar ages of cooling achieved in this study, which varied between 480 and 490 Ma, and the ages obtained by Pedrosa-Soares Figure 16.…”

Section: Discussionmentioning

confidence: 97%

“…Thus, considering the Ar-Ar ages of cooling achieved in this study, which varied between 480 and 490 Ma, and the ages obtained by Pedrosa-Soares Figure 16. Results of the Ar-Ar analyses for sample SCP-1351) and Valeriano et al (2011, for post-collisional granitoids crystallization in the Araçuaí-West Congo Orogen and in the Ribeira Belt, respectively, evidence suggest that by the end of the Cambrian, the crustal thickening generated by the collisions linked to the formation of Western Gondwana was followed by a regional extension that spread to the continental domains, i.e. to Paramirim Corridor (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The arrow indicates the increase in metamorphism and deformation temperature. Modified from Valeriano et al (2011).…”

Section: Discussionmentioning

confidence: 99%

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Tectonic inversion of compressional structures in the Southern portion of the Paramirim Corridor, Bahia, Brazil

et al. 2015

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ABSTRACT:The Paramirim Corridor represents the maximum inversion zone of the Paramirim Aulacogen. Reverse-to-reverse dextral shear zones and various types of folds dominate such corridor. These structures reflect a stress field that is WSW-ENE oriented, developed in units of Aulacogen basement, as well as in the Lagoa Real Intrusive Suite, of Statherian age, in Espinhaço and São Francisco supergroups, of Statherian-Tonian and Cryogenian ages, respectively, and in the Macaúbas-Santo Onofre Group, of Tonian age at the most. A rich collection of extensional structures truncate compressional structures of the Paramirim Corridor, characterized by normal shear zones and foliation, which is sometimes mylonitic, down-dip stretching lineation, drag folds, traction fractures and S/C structures. In these shear zones, quartz occurs truncated by the foliation, while feldspars are fractured and altered to white mica. Distribution of the quartz c-axes is at a maximum of 14° from the Z-axis. Thus, it suggests that the deformation activated mainly the basal glide planes in the direction. The paleostress study using the Win-Tensor software demonstrated that the regimen ranged between radial and pure distention. The S 1 direction oscillated around a vertical trend, while s 3 was sub-horizontal, with a predominant N230-050° direction. Ar-Ar ages in biotite obtained from the extensional shear zones ranged from 480 and 490 Ma. Together, data obtained for the structures associated with the late extensional regimen described in the present study suggest that its nucleation is associated with distal and brittle-ductile sectors of the gravitational collapse zone of Araçuaí-West Congo Orogen.KEYWORDS: Shear Zone; Paramirim Corridor; Gravitational Collapse. RESUMO: O Corredor do Paramirim representa a zona de máxima inversão do Aulacógeno do Paramirim, no qual predominam zonas de cisalhamento reversas-reversas destrais e vários tipos de dobras. Essas estruturas refletem um campo de tensão segundo WSW-ENE, os quais se desenvolvem nas unidades de embasamento do Aulacógeno, assim como na Suíte Intrusiva Lagoa Real, de idade estateriana, nos supergrupos Espinhaço e São Francisco, de idades estateriana-toniana e criogeniana, respectivamente, bem como no grupo Macaúbas-Santo

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Tectonic inversion of compressional structures in the Southern portion of the Paramirim Corridor, Bahia, Brazil

et al. 2015

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“…Summit level and base level technique are efficient instruments for geomorphologic analyses, especially those related to neotectonic movement (MARTIN, 1966;HUZITA;KASAMA, 1977;DEFFONTAINES et al, 1994;RIIS, 1996;FERHAT et al, 1998;KÜHNI;PFIFFENER, 2001;SATO;RAIM, 2004;RÖMER, 2008;MOTOKI et al, 2009a), eroded volcanic edifices (VILARDO et al, 1996;MALENGREAU et al, 1999;RUST et al, 2005;OKUMA et al, 2009), and erosive resistance AIRES et al, 2012 highest point, such as peaks and plateau tops. It shows the palaeo geomorphology before vertical erosion of valleys and drainages.…”

Section: Introductionmentioning

confidence: 99%

<b>Principle and geomorphological applicability of summit level and base level technique using Aster Gdem satellite-derived data and the original software Baz

Motoki

Sichel

et al. 2015

Acta Sci. Technol.

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ABSTRACT. This article presents principle and geomorphological applicability of summit level technique using Aster Gdem satellite-derived topographic data. Summit level corresponds to the virtual topographic surface constituted by local highest points, such as peaks and plateau tops, and reconstitutes palaeogeomorphology before the drainage erosion. Summit level map is efficient for reconstitution of palaeosurfaces and detection of active tectonic movement. Base level is the virtual surface composed of local lowest points, as valley bottoms. The difference between summit level and base level is called relief amount. These virtual maps are constructed by the original software Baz. The macro concavity index, MCI, is calculated from summit level and relief amount maps. The volume-normalised three-dimensional concavity index, TCI, is calculated from hypsometric diagram. The massifs with high erosive resistance tend to have convex general form and low MCI and TCI. Those with low resistance have concave form and high MCI and TCI. The diagram of TCI vs. MCI permits to distinguish erosive characteristics of massifs according to their constituent rocks. The base level map for ocean bottom detects the basement tectonic uplift which occurred before the formation of the volcanic seamounts.Keywords: summit level, base level, morphological analyses, palaeo-surface, erosive resistance, active fault.Princípio e aplicabilidade das técnicas de seppômen e sekkokumen para análises geomorfológicas com base nos dados de satélites do Aster Gdem e o software original Baz RESUMO. Este artigo apresenta o princípio e a aplicabilidade geomorfológica da técnica de seppômen e sekkokumen utilizando-se os dados topográficos de satélite do Aster Gdem. O seppômen corresponde à superfície topográfica virtual constituída por pontos culminantes locais, tais como picos e topos de platôs, e reconstitui a paleogeomorfologia antes da erosão por drenagens. O mapa de seppômen é eficiente para reconstituição de paleossuperfícies e detecção de movimentos tectônicos ativos. O sekkokumen é a superfície virtual composta de pontos locais mais baixos, como fundo de vales. A diferença entre seppômen e sekkokumen é denominada kifukuryô. Esses mapas virtuais são elaborados pelo software original Baz. O índice de macro concavidade de maciço, MCI, é calculado a partir dos mapas de seppômen e kifukuryô. O parâmetro de convexidade tridimensional normalizado por volume, TCI, é calculado por diagrama hipsométrico. Os maciços com alta resistência erosiva tendem a ter forma geral convexa e altos MCI e TCI. Aqueles com baixa resistência erosiva possuem forma côncava e baixos MCI e TCI. O diagrama de TCI v.s. MCI permite distinguir as características erosivas do maciço de acordo com as rochas constituintes. A técnica de sekkokumen aplicada ao fundo do oceano detecta o soerguimento tectônico do embasamento que ocorreu antes da formação dos montes submarinos vulcânicos.Palavras-chave: nível de pico, nível de base, análise morfológica, paleossuperfície, resistência erosiva, fa...

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“…560 Ma (Tupinambá, 1999;Silva et al, 2003Silva et al, , 2005, e os plútons porfiríticos tipo-I, como os plútons Maromba, Serra do Lagarto, Funil e Pedra Selada, que possuem idades U-Pb e 207 Pb/ 206 Pb entre 590 e 570 Ma Mendes et al, 2006;Pereira et al, 2001;Silva et al, 2003). Os granitos sin-colisionais a tardi-colisionais incluem também granitos peraluminosos, como os batólitos Serra das Araras e Rio Turvo, o qual possui idade U-Pb TIMS em monazita de 579 ± 6 Ma, interpretada como idade de cristalização do corpo Valladares, 1996 Frades, e é correlacionado ao colapso orogênico da Faixa Ribeira Central Heilbron and Machado, 2003;Valeriano et al, 2011;Bento dos Santos et al, 2015). O primeiro intervalo do magmatismo pós-colisional coincide com o pico de metamorfismo da Orogenia Búzios (Schmitt et al, 2004).…”

Section: Magmatismo Granítico Do Cinturão Ribeira Centralunclassified

Batólito Serra das Araras: um exemplo de magmatismo granítico peraluminoso sintectônico do Ediacarano, região sudoeste do estado do Rio de Janeiro

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U-Pb LA-MC-ICPMS geochronology of Cambro-Ordovician post-collisional granites of the Ribeira belt, southeast Brazil: Terminal Brasiliano magmatism in central Gondwana supercontinent

Cited by 58 publications

References 20 publications

Tectonic inversion of compressional structures in the Southern portion of the Paramirim Corridor, Bahia, Brazil

Tectonic inversion of compressional structures in the Southern portion of the Paramirim Corridor, Bahia, Brazil

<b>Principle and geomorphological applicability of summit level and base level technique using Aster Gdem satellite-derived data and the original software Baz

Batólito Serra das Araras: um exemplo de magmatismo granítico peraluminoso sintectônico do Ediacarano, região sudoeste do estado do Rio de Janeiro

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