Sedimentation, metamorphism and granite generation in a back-arcregion : records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil.

Detalhes bibliográficos
Autor(a) principal: Richter, Fabiana
Data de Publicação: 2016
Outros Autores: Lana, Cristiano de Carvalho, Stevens, Gary, Buick, Ian S., Soares, Antônio Carlos Pedrosa, Alkmim, Fernando Flecha de, Cutts, Kathryn Ann
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFOP
Texto Completo: http://www.repositorio.ufop.br/handle/123456789/8843
https://doi.org/10.1016/j.precamres.2015.10.012
Resumo: The Nova Venécia migmatite-granulite-granite Complex (NVC) in the core of the Arac¸ uaí Orogen (AO,630–480 Ma), southeast Brazil, exposes a mid-crustal section with abundant evidence for high-grademetamorphism linked to production, extraction and emplacement of peraluminous melts. Although theAO represents the textbook example of a confined orogen, there is surprisingly a lack of detailed studieson its metamorphic evolution related to widespread granitogenesis occurring from the Neoproterozoic toearly Paleozoic. In this study, we combine U–Pb geochronology and metamorphic petrology to constrainthe evolution of the NVC migmatitic metasedimentary granulites, from deposition to high-grade meta-morphism, and to correlate the metamorphic history of the terrain with the several episodes of granitemagmatism (G1–G5) in the AO. The sedimentation of the NVC can be bracketed within a maximum 13 Myperiod, between its maximum depositional age at ca. 606 Ma and the intrusion of early syn-collisionalgranitoids at 593 Ma. Compilation of available U–Pb data shows that the bulk of the magmatic rocks in theAO (G1 + G2 rocks) crystallized contemporaneously over a period of 15 My (ca. 595–570 Ma) with a peakat ca. 575 Ma. Although it is inferred a protracted period of crustal heating in the AO (from ca. 640–480),U–Pb ages of metamorphic and magmatic zircons and monazites suggest at least two major heat pulsesat ca. 593–560 and 523–495 Ma. The timing of peak regional metamorphism is constrained from 575 to560 Ma, which temporally overlaps with the crystallization of the youngest granitoids. Phase equilibriummodeling of metasedimentary granulites from three different localities within the NVC, indicates thatall areas record similar peak P–T conditions of 750–850◦C and 5300–7500 bar. This is followed by hightemperature retrograde evolution to 640–800◦C and 4500–6000 bar. A post-collisional thermal eventlinked to the intrusion of large norite bodies (520–480 Ma) is recorded in our metagreywackes (monaziteU–Pb) and in granites (monazite and zircon U–Pb) from 523 to 495 Ma.
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spelling Sedimentation, metamorphism and granite generation in a back-arcregion : records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil.Nova VeneciaGranuliteAraçuaiOrogenThe Nova Venécia migmatite-granulite-granite Complex (NVC) in the core of the Arac¸ uaí Orogen (AO,630–480 Ma), southeast Brazil, exposes a mid-crustal section with abundant evidence for high-grademetamorphism linked to production, extraction and emplacement of peraluminous melts. Although theAO represents the textbook example of a confined orogen, there is surprisingly a lack of detailed studieson its metamorphic evolution related to widespread granitogenesis occurring from the Neoproterozoic toearly Paleozoic. In this study, we combine U–Pb geochronology and metamorphic petrology to constrainthe evolution of the NVC migmatitic metasedimentary granulites, from deposition to high-grade meta-morphism, and to correlate the metamorphic history of the terrain with the several episodes of granitemagmatism (G1–G5) in the AO. The sedimentation of the NVC can be bracketed within a maximum 13 Myperiod, between its maximum depositional age at ca. 606 Ma and the intrusion of early syn-collisionalgranitoids at 593 Ma. Compilation of available U–Pb data shows that the bulk of the magmatic rocks in theAO (G1 + G2 rocks) crystallized contemporaneously over a period of 15 My (ca. 595–570 Ma) with a peakat ca. 575 Ma. Although it is inferred a protracted period of crustal heating in the AO (from ca. 640–480),U–Pb ages of metamorphic and magmatic zircons and monazites suggest at least two major heat pulsesat ca. 593–560 and 523–495 Ma. The timing of peak regional metamorphism is constrained from 575 to560 Ma, which temporally overlaps with the crystallization of the youngest granitoids. Phase equilibriummodeling of metasedimentary granulites from three different localities within the NVC, indicates thatall areas record similar peak P–T conditions of 750–850◦C and 5300–7500 bar. This is followed by hightemperature retrograde evolution to 640–800◦C and 4500–6000 bar. A post-collisional thermal eventlinked to the intrusion of large norite bodies (520–480 Ma) is recorded in our metagreywackes (monaziteU–Pb) and in granites (monazite and zircon U–Pb) from 523 to 495 Ma.2017-10-02T14:12:01Z2017-10-02T14:12:01Z2016info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfRICHTER, F. et al. Sedimentation, metamorphism and granite generation in a back-arcregion: records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil. Precambrian Research, v. 272, p. 78-100, 2016. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0301926815003472>. Acesso em: 25 ago. 2017. 1342-937Xhttp://www.repositorio.ufop.br/handle/123456789/8843https://doi.org/10.1016/j.precamres.2015.10.012O periódico Precambrian Research concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 4193050978692.info:eu-repo/semantics/openAccessRichter, FabianaLana, Cristiano de CarvalhoStevens, GaryBuick, Ian S.Soares, Antônio Carlos PedrosaAlkmim, Fernando Flecha deCutts, Kathryn Annengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOP2020-04-08T15:29:30Zoai:repositorio.ufop.br:123456789/8843Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332020-04-08T15:29:30Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false
dc.title.none.fl_str_mv Sedimentation, metamorphism and granite generation in a back-arcregion : records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil.
title Sedimentation, metamorphism and granite generation in a back-arcregion : records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil.
spellingShingle Sedimentation, metamorphism and granite generation in a back-arcregion : records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil.
Richter, Fabiana
Nova Venecia
Granulite
Araçuai
Orogen
title_short Sedimentation, metamorphism and granite generation in a back-arcregion : records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil.
title_full Sedimentation, metamorphism and granite generation in a back-arcregion : records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil.
title_fullStr Sedimentation, metamorphism and granite generation in a back-arcregion : records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil.
title_full_unstemmed Sedimentation, metamorphism and granite generation in a back-arcregion : records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil.
title_sort Sedimentation, metamorphism and granite generation in a back-arcregion : records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil.
author Richter, Fabiana
author_facet Richter, Fabiana
Lana, Cristiano de Carvalho
Stevens, Gary
Buick, Ian S.
Soares, Antônio Carlos Pedrosa
Alkmim, Fernando Flecha de
Cutts, Kathryn Ann
author_role author
author2 Lana, Cristiano de Carvalho
Stevens, Gary
Buick, Ian S.
Soares, Antônio Carlos Pedrosa
Alkmim, Fernando Flecha de
Cutts, Kathryn Ann
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Richter, Fabiana
Lana, Cristiano de Carvalho
Stevens, Gary
Buick, Ian S.
Soares, Antônio Carlos Pedrosa
Alkmim, Fernando Flecha de
Cutts, Kathryn Ann
dc.subject.por.fl_str_mv Nova Venecia
Granulite
Araçuai
Orogen
topic Nova Venecia
Granulite
Araçuai
Orogen
description The Nova Venécia migmatite-granulite-granite Complex (NVC) in the core of the Arac¸ uaí Orogen (AO,630–480 Ma), southeast Brazil, exposes a mid-crustal section with abundant evidence for high-grademetamorphism linked to production, extraction and emplacement of peraluminous melts. Although theAO represents the textbook example of a confined orogen, there is surprisingly a lack of detailed studieson its metamorphic evolution related to widespread granitogenesis occurring from the Neoproterozoic toearly Paleozoic. In this study, we combine U–Pb geochronology and metamorphic petrology to constrainthe evolution of the NVC migmatitic metasedimentary granulites, from deposition to high-grade meta-morphism, and to correlate the metamorphic history of the terrain with the several episodes of granitemagmatism (G1–G5) in the AO. The sedimentation of the NVC can be bracketed within a maximum 13 Myperiod, between its maximum depositional age at ca. 606 Ma and the intrusion of early syn-collisionalgranitoids at 593 Ma. Compilation of available U–Pb data shows that the bulk of the magmatic rocks in theAO (G1 + G2 rocks) crystallized contemporaneously over a period of 15 My (ca. 595–570 Ma) with a peakat ca. 575 Ma. Although it is inferred a protracted period of crustal heating in the AO (from ca. 640–480),U–Pb ages of metamorphic and magmatic zircons and monazites suggest at least two major heat pulsesat ca. 593–560 and 523–495 Ma. The timing of peak regional metamorphism is constrained from 575 to560 Ma, which temporally overlaps with the crystallization of the youngest granitoids. Phase equilibriummodeling of metasedimentary granulites from three different localities within the NVC, indicates thatall areas record similar peak P–T conditions of 750–850◦C and 5300–7500 bar. This is followed by hightemperature retrograde evolution to 640–800◦C and 4500–6000 bar. A post-collisional thermal eventlinked to the intrusion of large norite bodies (520–480 Ma) is recorded in our metagreywackes (monaziteU–Pb) and in granites (monazite and zircon U–Pb) from 523 to 495 Ma.
publishDate 2016
dc.date.none.fl_str_mv 2016
2017-10-02T14:12:01Z
2017-10-02T14:12:01Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv RICHTER, F. et al. Sedimentation, metamorphism and granite generation in a back-arcregion: records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil. Precambrian Research, v. 272, p. 78-100, 2016. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0301926815003472>. Acesso em: 25 ago. 2017.
 1342-937X
http://www.repositorio.ufop.br/handle/123456789/8843
https://doi.org/10.1016/j.precamres.2015.10.012
identifier_str_mv RICHTER, F. et al. Sedimentation, metamorphism and granite generation in a back-arcregion: records from the Ediacaran Nova Venécia Complex, Araçuaí Orogen, Southeastern Brazil. Precambrian Research, v. 272, p. 78-100, 2016. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0301926815003472>. Acesso em: 25 ago. 2017.
 1342-937X
url http://www.repositorio.ufop.br/handle/123456789/8843
https://doi.org/10.1016/j.precamres.2015.10.012
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language eng
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reponame_str Repositório Institucional da UFOP
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repository.name.fl_str_mv Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)
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