Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.

Detalhes bibliográficos
Autor(a) principal: Lana, Cristiano de Carvalho
Data de Publicação: 2010
Outros Autores: Tohver, Eric, Cawood, Peter Anthony
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFOP
dARK ID: ark:/61566/0013000009z2m
Texto Completo: http://www.repositorio.ufop.br/handle/123456789/3750
https://doi.org/10.1016/j.precamres.2009.12.001
Resumo: The Barberton granitoid-greenstone belt is a classic dome-and-keel province, characterized by kilometerscale gneiss domes and elongate keels of largely folded supracrustal rocks. Combined U–Pb SHRIMP data and structural mapping demonstrate that the geometry of the Barberton belt reflects events that occurred over ∼30 million year interval, from ca. 3230 and 3203 Ma. Early deformation with NW–SE shortening in the upper crust was accompanied by emplacement of tonalite-trondhjemite-granodiorite TTG magmas at 3234±12 and 3226±9 Ma. Much of the structural grain of the greenstone belt relates to a long episode of post-orogenic extension, with NE-directed extension in the lower crust leading to exhumation of high-grade gneisses in the southern Barberton terrane. Advective heat transfer during emplacement of kilometer-scale (TTG) plutons around the margins of the greenstone belt facilitated the infolding of the relatively denser and colder greenstone sequence. The end of this tectonic cycle is punctuated by the emplacement of the undeformed, 3203±7Ma Dalmein pluton, which sharply truncates not only anticlines and synclines in the greenstone belt but also the dominant fabric in the high-grade gneisses.
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spelling Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.Dome-and-keelBarbertonArchean tectonicsGreenstone beltCore-complexThe Barberton granitoid-greenstone belt is a classic dome-and-keel province, characterized by kilometerscale gneiss domes and elongate keels of largely folded supracrustal rocks. Combined U–Pb SHRIMP data and structural mapping demonstrate that the geometry of the Barberton belt reflects events that occurred over ∼30 million year interval, from ca. 3230 and 3203 Ma. Early deformation with NW–SE shortening in the upper crust was accompanied by emplacement of tonalite-trondhjemite-granodiorite TTG magmas at 3234±12 and 3226±9 Ma. Much of the structural grain of the greenstone belt relates to a long episode of post-orogenic extension, with NE-directed extension in the lower crust leading to exhumation of high-grade gneisses in the southern Barberton terrane. Advective heat transfer during emplacement of kilometer-scale (TTG) plutons around the margins of the greenstone belt facilitated the infolding of the relatively denser and colder greenstone sequence. The end of this tectonic cycle is punctuated by the emplacement of the undeformed, 3203±7Ma Dalmein pluton, which sharply truncates not only anticlines and synclines in the greenstone belt but also the dominant fabric in the high-grade gneisses.2014-11-10T17:06:11Z2014-11-10T17:06:11Z2010info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfLANA, C. de C.; TOHVER, E.; CAWOOD, P. A. Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa. Precambrian Research, v. 177, p. 199-211, 2010. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0301926809002484?np=y>. Acesso em: 04 de set. 2014.1807-0354http://www.repositorio.ufop.br/handle/123456789/3750https://doi.org/10.1016/j.precamres.2009.12.001ark:/61566/0013000009z2mO periódico Precambrian Research concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3466020623965.info:eu-repo/semantics/openAccessLana, Cristiano de CarvalhoTohver, EricCawood, Peter Anthonyengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOP2024-11-10T21:38:56Zoai:repositorio.ufop.br:123456789/3750Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332024-11-10T21:38:56Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false
dc.title.none.fl_str_mv Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.
title Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.
spellingShingle Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.
Lana, Cristiano de Carvalho
Dome-and-keel
Barberton
Archean tectonics
Greenstone belt
Core-complex
title_short Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.
title_full Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.
title_fullStr Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.
title_full_unstemmed Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.
title_sort Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.
author Lana, Cristiano de Carvalho
author_facet Lana, Cristiano de Carvalho
Tohver, Eric
Cawood, Peter Anthony
author_role author
author2 Tohver, Eric
Cawood, Peter Anthony
author2_role author
author
dc.contributor.author.fl_str_mv Lana, Cristiano de Carvalho
Tohver, Eric
Cawood, Peter Anthony
dc.subject.por.fl_str_mv Dome-and-keel
Barberton
Archean tectonics
Greenstone belt
Core-complex
topic Dome-and-keel
Barberton
Archean tectonics
Greenstone belt
Core-complex
description The Barberton granitoid-greenstone belt is a classic dome-and-keel province, characterized by kilometerscale gneiss domes and elongate keels of largely folded supracrustal rocks. Combined U–Pb SHRIMP data and structural mapping demonstrate that the geometry of the Barberton belt reflects events that occurred over ∼30 million year interval, from ca. 3230 and 3203 Ma. Early deformation with NW–SE shortening in the upper crust was accompanied by emplacement of tonalite-trondhjemite-granodiorite TTG magmas at 3234±12 and 3226±9 Ma. Much of the structural grain of the greenstone belt relates to a long episode of post-orogenic extension, with NE-directed extension in the lower crust leading to exhumation of high-grade gneisses in the southern Barberton terrane. Advective heat transfer during emplacement of kilometer-scale (TTG) plutons around the margins of the greenstone belt facilitated the infolding of the relatively denser and colder greenstone sequence. The end of this tectonic cycle is punctuated by the emplacement of the undeformed, 3203±7Ma Dalmein pluton, which sharply truncates not only anticlines and synclines in the greenstone belt but also the dominant fabric in the high-grade gneisses.
publishDate 2010
dc.date.none.fl_str_mv 2010
2014-11-10T17:06:11Z
2014-11-10T17:06:11Z
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 LANA, C. de C.; TOHVER, E.; CAWOOD, P. A. Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa. Precambrian Research, v. 177, p. 199-211, 2010. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0301926809002484?np=y>. Acesso em: 04 de set. 2014.
1807-0354
http://www.repositorio.ufop.br/handle/123456789/3750
https://doi.org/10.1016/j.precamres.2009.12.001
dc.identifier.dark.fl_str_mv ark:/61566/0013000009z2m
identifier_str_mv LANA, C. de C.; TOHVER, E.; CAWOOD, P. A. Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa. Precambrian Research, v. 177, p. 199-211, 2010. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0301926809002484?np=y>. Acesso em: 04 de set. 2014.
1807-0354
ark:/61566/0013000009z2m
url http://www.repositorio.ufop.br/handle/123456789/3750
https://doi.org/10.1016/j.precamres.2009.12.001
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFOP
instname:Universidade Federal de Ouro Preto (UFOP)
instacron:UFOP
instname_str Universidade Federal de Ouro Preto (UFOP)
instacron_str UFOP
institution UFOP
reponame_str Repositório Institucional da UFOP
collection Repositório Institucional da UFOP
repository.name.fl_str_mv Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)
repository.mail.fl_str_mv repositorio@ufop.edu.br
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