Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa.
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , |
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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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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1817705782847733760 |