Готові списки джерел за темами / Gondwana; Brazil; Paraguay Belt

Добірка наукової літератури з теми "Gondwana; Brazil; Paraguay Belt"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Gondwana; Brazil; Paraguay Belt"

Barboza, Elzio Da Silva, Anderson Costa dos Santos, Carlos José Fernandes, and Mauro César Geraldes. "PARAGUAY BELT LITHOSTRATIGRAPHIC AND TECTONIC CHARACTERIZATION: IMPLICATIONS IN THE EVOLUTION OF THE OROGEN (MATO GROSSO-BRAZIL) / CARACTERIZAÇÃO LITOESTRATIGRÁFICA E TECTÔNICA DO CINTURÃO PARAGUAY : IMPLICAÇÕES NA EVOLUÇÃO DO ORÓGENO (MATO GROSSO-BRASIL)." Journal of Sedimentary Environments 3, no. 2 (May 17, 2018): 54–73. http://dx.doi.org/10.12957/jse.2018.34219.

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The Paraguay Belt is composed by sediments deposited due to extensional events followed by inversion with deformation and magmatism and lastly collision of the Amazonian Craton and Paranapanema Block. The marine sedimentation, with Neoproterozoic ages, should have occurred in a continental shelf region, at about 800-550 Ma, when the closing of many oceans gave place to the amalgamation of the Gondwana supercontinent. Three areas were selected for this study which configuration define the perpendicular profile of the Paraguay Belt and allow the characterization of the main regional structures.The structural analysis in the sites here reported and surrounding areas allow suggesting that three deformational events are recorded in the rocks of this region. The sedimentary bedding S0, marked by alternations of dark gray and whitish coloration in the seritic phyllites is folded and the axial plane (Sn) is marked by a cleavage of ardosian. These surfaces are cut by two other deformations, Sn + 1 surface that plunges at high angles to SE as fracture cleavage and Sn + 2 that is orthogonal to the previous deformations and has NW-SE direction with vertical dips, where sometimes occurs quartz veins with high gold content. The Paraguay Belt fan geometry observed in the Sn foliation was developed during the closing of a Brazilian ocean that evolved between the Paranapanema Block and the Amazonian Craton. ResumoO Cinturão Paraguai é composto por sedimentos depositados durante eventos extencionais seguidos de inversão com deformação e magmatismo e, por último, colisão do Craton Amazônico e do Bloco Paranapanema. A sedimentação marinha, com idades Neoproterozóicas, ocorreu em uma região de plataforma continental, entre 800-550 Ma, quando o fechamento de muitos oceanos deu lugar à fusão do supercontinente Gondwana. Três áreas foram selecionadas para este estudo cuja configuração define um perfil perpendicular do Cinturão do Paraguai e permite a caracterização das principais estruturas regionais.A análise estrutural nos locais aqui relatados e áreas adjacentes permite sugerir que as rochas do orógeno passou por três eventos deformacionais. O acamamento sedimentar S0, marcado por alternâncias de coloração cinza-escura e esbranquiçada nos filitos e siltitos, é dobrado e o plano axial (Sn) é marcado por uma clivagem ardosiana. Estas superfícies são cortadas por outras duas deformações, Sn + 1 que mergulha em ângulos elevados para SE como clivagem de fratura e Sn + 2 que é ortogonal às deformações anteriores e tem direção NW-SE com mergulhos verticais, onde às vezes ocorrem veios de quartzo com alto teor de ouro. A geometria em leque do Cinturão Paraguay observada na foliação de Sn foi desenvolvida durante o fechamento de um oceano brasileiro que evoluiu entre o Bloco Paranapanema e o Craton Amazônico.

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McGee, Ben, Marly Babinski, Ricardo Trindade, and Alan S. Collins. "Tracing final Gondwana assembly: Age and provenance of key stratigraphic units in the southern Paraguay Belt, Brazil." Precambrian Research 307 (April 2018): 1–33. http://dx.doi.org/10.1016/j.precamres.2017.12.030.

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Babinski, Marly, Ben McGee, Cláudia do Couto Tokashiki, Colombo C. G. Tassinari, Gerson Souza Saes, and Francisco Egidio Cavalcante Pinho. "Comparing two arms of an orogenic belt during Gondwana amalgamation: Age and provenance of the Cuiabá Group, northern Paraguay Belt, Brazil." Journal of South American Earth Sciences 85 (August 2018): 6–42. http://dx.doi.org/10.1016/j.jsames.2018.04.009.

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Manoel, Talitta Nunes, David Selby, Matthieu Emmanuel Galvez, Jayme Alfredo Dexheimer Leite, and Luan Nonato Figueiredo. "A pre-Sturtian depositional age of the lower Paraguay Belt, Western Brazil, and its relationship to western Gondwana magmatism." Gondwana Research 89 (January 2021): 238–46. http://dx.doi.org/10.1016/j.gr.2020.10.002.

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da Silva, Marcelo Ferreira, Elton Luiz Dantas, Massimo Matteini, and Ricardo I. F. Trindade. "Late Tonian explosive volcanism and hyaloclastites in northern Paraguay Belt, Central Brazil: A record of Rodinia break-up in western Gondwana." Precambrian Research 382 (November 2022): 106862. http://dx.doi.org/10.1016/j.precamres.2022.106862.

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McGee, Ben, Alan S. Collins, Ricardo I. F. Trindade, and Fred Jourdan. "Investigating mid-Ediacaran glaciation and final Gondwana amalgamation using coupled sedimentology and40Ar/39Ar detrital muscovite provenance from the Paraguay Belt, Brazil." Sedimentology 62, no. 1 (October 3, 2014): 130–54. http://dx.doi.org/10.1111/sed.12143.

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McGee, Ben, Alan S. Collins, and Ricardo I. F. Trindade. "G'day Gondwana — the final accretion of a supercontinent: U–Pb ages from the post-orogenic São Vicente Granite, northern Paraguay Belt, Brazil." Gondwana Research 21, no. 2-3 (March 2012): 316–22. http://dx.doi.org/10.1016/j.gr.2011.04.011.

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dos Santos, Iara Maria, Roberto Vizeu L. Pinheiro, Robert E. Holdsworth, Afonso Cesar R. Nogueira, Hudson Pereira Santos, and Fabio Henrique G. Domingos. "Basement–cover relationships and deformation in the Northern Paraguai Belt, central Brazil: implications for the Neoproterozoic–early Paleozoic history of western Gondwana." Journal of the Geological Society 177, no. 3 (November 19, 2019): 475–91. http://dx.doi.org/10.1144/jgs2018-184.

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BARBOZA, Elzio da Silva, Mauro Cesar GERALDES, Francisco Egídio Cavalcante PINHO, Carlos José FERNANDES, and Carlos Humberto da SILVA. "STRUCTURAL, STRATIGRAPHIC AND METALLOGENETIC ASPECTS OF THE PARAGUAY FOLD AND THRUST BELT: IMPLICATIONS FOR GOLD MINERALIZATION AND COLLAGE OF THE GONDWANA." Geosciences = Geociências 39, no. 2 (July 16, 2020): 279–96. http://dx.doi.org/10.5016/geociencias.v39i2.12699.

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ABSTRACT - Paraguay Belt occupies the western portion of the Tocantins Province, surrounding the Southeast of the Amazonian Craton and the eastern border of the Rio Apa Block, suggesting continuity with Tucavaca Belt in Bolivia. The rocks of the Paraguay belt were initially deposited in a glaciomarine environment in sites proximal to the cratonic area and deeper marine under the influence of turbidite flows in distal sites (Cuiabá Group, Bauxi and Puga Formation). The cap carbonates, thick limestone and dolostone succession of the Araras Group and siltstones and diamictites of the Serra Azul Formation related to Glaskiers glaciation overlay these diamictites (related to Marinoan glaciation). On the top there are terrigenous sediments of the Alto Paraguay Group, represented by sandstones of Raizama and claystones of Diamantino formations, respectively. The belt can be divided into three distinct structural zones: The Internal Domain is comprised of turbidite and glaciogenic sequences. Glaciogenic rocks on the base and carbonaceous and terrigenous sediments on the top occur in the External Domain. Horizontal platformal cover on the Amazonian Craton rocks are characterized by open folds. Structural studies allowed characterization of continuous deformational phases: the main deformational phase generated regional inverse folds with a NE-SW trend and fan geometry. Several regionally widespread lode-type gold deposits related to four types of the quartz veins were identified: type 1 is in concordance to bedding, type 2 is parallel to Sn, type 3 is parallel to Sn+2, and vertical Type 4 (Au-rich) is orthogonal to Sn. Late deformation developed in the Cuiabá region, recorded the closure of the ocean and the invertion where the hydrothermal fluids are the responsible for the orebodies formation. Keywords: Paraguay Belt, Structural, Stratigraphy, Metalogenesis.

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Figueiredo, Milene F., Marly Babinski, and Carlos J. S. Alvarenga. "Chapter 46 The Serra Azul Formation, Paraguay Belt, Brazil." Geological Society, London, Memoirs 36, no. 1 (2011): 499–502. http://dx.doi.org/10.1144/m36.46.

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Більше джерел

Дисертації з теми "Gondwana; Brazil; Paraguay Belt"

McGee, Ben. "Supercontinents and glaciation: a perspective from western Gondwana." Thesis, 2013. http://hdl.handle.net/2440/82466.

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Precise timing for the formation of the Palaeozoic supercontinent Gondwana has long eluded the geological community. Early hypotheses postulated that amalgamation occurred in the mid-late Neopro¬terozoic via a collision between East and West Gondwana. This idea developed with the identification of discrete collisional events between diverse, relatively small Neoproterozoic continents that amalgamated Gondwana in a piecemeal fashion over 150 million years, with a series of late Ediacaran–Cambrian orogens that represent the final phase of Gondwana amalgamation. A salient feature of the rocks preserving these events in the Neoproterozoic sedimentary record is the preservation of glacial sediments. Significant debate has centred around firstly whether these deposits are in fact glacial and secondly the spatial extent of these glaciations. This thesis addresses these deficits in our knowledge by presenting detailed sedimentology, geochronology, palaeomagnetic results from western Gondwana. The Cryogenian-aged Toekems Sub-basin in the Damara Belt, Namibia comprises a wedge dominantly clastic, glacially influenced sediments. Our field observations and results imply a significant disconformity beneath the Naauwpoort Volcanics and suggest multi-phase rifting during the breakup of south-western Congo Craton from Rodinia. The northern Paraguay Belt in South America developed in response to the collision between the Amazonian Craton, the Rio Apa Block, the São Francisco Craton and the Paranapanema Block. The alleged ‘Brasiliano’ age (~620 Ma) of orogenesis was recently questioned by palaeomagnetic and radioisotopic ages that indicate the closing stages of orogenesis occurred well into the Cambrian that are believed to mark the suture zone of the Clymene Ocean—interpreted amongst the youngest of the Gondwana amalgamation orogens. The post-orogenic São Vicente Granite provides a long sort after minimum age of 518 ± 4 Ma for orogenesis within the belt, constraining the termination of deformation within the northern Paraguay Belt. The Alto Paraguay Group, the youngest stratigraphic unit in the northern Paraguay Belt, contains unequivocal evidence for a glacial influence on sedimentation. ⁴⁰Ar/³⁹Ar detrital muscovite cooling ages from the upper part of the Alto Paraguay Group are as young as 544 ± 7 Ma. When considered with other data presented here, these ages suggest that this package of rocks developed in a mid-Ediacaran glaciation consistent with that expressed in the Gaskiers Formation of Newfoundland, Canada. U/Pb zircon maxi¬mum depositional ages from the top of the Alto Paraguay Group indicate that final sedimentation began no earlier than 527 Ma. The εHf[subscript] signature is consistent with a predominantly Amazonian source until the early- Neoproterozoic at which point the signal becomes significantly more evolved. new palaeomagnetic data from Alto Paraguay Group represent a secondary magnetisation, likely acquired during regional emplacement of Jurassic basalt. This finding is at odds with recent results that have been used to suggest Amazonia was at low latitudes during the Ediacaran, which has implications for the snowball earth hypothesis and the tectonic evolution of the Paraguay Belt. These data, when combined with other evidence discussed here, are consistent with an ocean to the east of the present-day Amazonian Craton that didn’t close until the Cambrian.
Thesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2013

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Тези доповідей конференцій з теми "Gondwana; Brazil; Paraguay Belt"

de Sousa Moro*, Polyanna, George Sand Leão Araújo de França, and Carolina Thereza Soares e Silva. "Anisotropy of seismic waves in the Paraguay Belt from shear wave splitting analysis." In 14th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 3-6 August 2015. Brazilian Geophysical Society, 2015. http://dx.doi.org/10.1190/sbgf2015-281.

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Passarelli, Cláudia Regina, Mariana De Matheus Marques dos Santos, Elis Miguele Sá, Miguel Angelo Stipp Basei, and Oswaldo Siga Jr. "The Southern Ribeira Belt Metasediments, Southeast Brazil: Geochronological Constraints on the Evolution of the Western Gondwana." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2040.

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