1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications

Detalhes bibliográficos
Autor(a) principal: FRAGA, Lêda Maria Barreto
Data de Publicação: 2009
Outros Autores: MACAMBIRA, Moacir José Buenano, DALL’AGNOL, Roberto, COSTA, João Batista Sena Costa
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional de Geociências - RIGEO
Texto Completo: https://rigeo.cprm.gov.br/handle/doc/573
Resumo: Age and origin of the charnockitic rocks of the central part of the Guyana Shield have been a matter of discussion. These rocks have been interpreted either as Transamazonian granulites metamorphosed around 2.02 Ga or as 1.56 Ga old igneous charnockites.Recently, most of the Roraima charnockitic rocks have been recognized as igneous rocks and included into the Serra da Prata Suite (SPS). Five Pb–Pb singlezircon evaporation ages were obtained for samples representative of different facies of the SPS and these constrained the age of the charnockitic magmatism between 1943 ± 5 Ma and 1933 ± 2 Ma. This charnockitic magmatism may be related to a post-collisional setting after the evolution of the Cauarane-Coeroeni Belt ( 2.00 Ga), or may represent a post-collisional (or intracontinental?) magmatism related to orogenic activities along the plate margins around 1.95–1.94 Ga
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spelling FRAGA, Lêda Maria BarretoMACAMBIRA, Moacir José BuenanoDALL’AGNOL, RobertoCOSTA, João Batista Sena Costa2013-12-19T16:32:42Z2013-12-19T16:32:42Z2009FRAGA, Lêda Maria Barreto; MACAMBIRA, Moacir José Buenano; DALL’AGNOL, Roberto; COSTA, João Batista Sena Costa. 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications. Journal of South American Earth Sciences, Oxford, v.v. 27, n.4, p.247-257, Oxford.https://rigeo.cprm.gov.br/handle/doc/573Age and origin of the charnockitic rocks of the central part of the Guyana Shield have been a matter of discussion. These rocks have been interpreted either as Transamazonian granulites metamorphosed around 2.02 Ga or as 1.56 Ga old igneous charnockites.Recently, most of the Roraima charnockitic rocks have been recognized as igneous rocks and included into the Serra da Prata Suite (SPS). Five Pb–Pb singlezircon evaporation ages were obtained for samples representative of different facies of the SPS and these constrained the age of the charnockitic magmatism between 1943 ± 5 Ma and 1933 ± 2 Ma. This charnockitic magmatism may be related to a post-collisional setting after the evolution of the Cauarane-Coeroeni Belt ( 2.00 Ga), or may represent a post-collisional (or intracontinental?) magmatism related to orogenic activities along the plate margins around 1.95–1.94 GaGEOCRONOLOGIAMAGMATISMOROCHAS CHARNOCKÍTICASPALEOPROTEROZÓICOCRÁTON AMAZÔNICOBRASILRORAIMA1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implicationsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleOxfordengreponame:Repositório Institucional de Geociências - RIGEOinstname:Companhia de Pesquisa de Recursos Minerais (CPRM)instacron:CPRMinfo:eu-repo/semantics/openAccessTEXTart_fraga.pdf.txtart_fraga.pdf.txtExtracted texttext/plain57830http://rigeo.cprm.gov.br/jspui/bitstream/doc/573/2/art_fraga.pdf.txtdacdee9268b5b25120ad0b99137c0648MD52THUMBNAILart_fraga.pdf.jpgart_fraga.pdf.jpgGenerated Thumbnailimage/jpeg1648http://rigeo.cprm.gov.br/jspui/bitstream/doc/573/3/art_fraga.pdf.jpg19979f3aaf64c63103c2b6d047a39abaMD53ORIGINALart_fraga.pdfart_fraga.pdfproducao cientificaapplication/pdf1627566http://rigeo.cprm.gov.br/jspui/bitstream/doc/573/1/art_fraga.pdf4a06655a86eafb571d9d9261d5a5cd95MD51doc/5732023-02-13 11:10:48.832oai:rigeo.sgb.gov.br:doc/573Repositório InstitucionalONGhttps://rigeo.sgb.gov.br/oai/request https://rigeo.cprm.gov.br/oai/requestrigeo@sgb.gov.bropendoar:2023-02-13T14:10:48Repositório Institucional de Geociências - RIGEO - Companhia de Pesquisa de Recursos Minerais (CPRM)false
dc.title.none.fl_str_mv 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications
title 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications
spellingShingle 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications
FRAGA, Lêda Maria Barreto
GEOCRONOLOGIA
MAGMATISMO
ROCHAS CHARNOCKÍTICAS
PALEOPROTEROZÓICO
CRÁTON AMAZÔNICO
BRASIL
RORAIMA
title_short 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications
title_full 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications
title_fullStr 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications
title_full_unstemmed 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications
title_sort 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications
author FRAGA, Lêda Maria Barreto
author_facet FRAGA, Lêda Maria Barreto
MACAMBIRA, Moacir José Buenano
DALL’AGNOL, Roberto
COSTA, João Batista Sena Costa
author_role author
author2 MACAMBIRA, Moacir José Buenano
DALL’AGNOL, Roberto
COSTA, João Batista Sena Costa
author2_role author
author
author
dc.contributor.author.fl_str_mv FRAGA, Lêda Maria Barreto
MACAMBIRA, Moacir José Buenano
DALL’AGNOL, Roberto
COSTA, João Batista Sena Costa
dc.subject.por.fl_str_mv GEOCRONOLOGIA
MAGMATISMO
ROCHAS CHARNOCKÍTICAS
PALEOPROTEROZÓICO
CRÁTON AMAZÔNICO
BRASIL
RORAIMA
topic GEOCRONOLOGIA
MAGMATISMO
ROCHAS CHARNOCKÍTICAS
PALEOPROTEROZÓICO
CRÁTON AMAZÔNICO
BRASIL
RORAIMA
description Age and origin of the charnockitic rocks of the central part of the Guyana Shield have been a matter of discussion. These rocks have been interpreted either as Transamazonian granulites metamorphosed around 2.02 Ga or as 1.56 Ga old igneous charnockites.Recently, most of the Roraima charnockitic rocks have been recognized as igneous rocks and included into the Serra da Prata Suite (SPS). Five Pb–Pb singlezircon evaporation ages were obtained for samples representative of different facies of the SPS and these constrained the age of the charnockitic magmatism between 1943 ± 5 Ma and 1933 ± 2 Ma. This charnockitic magmatism may be related to a post-collisional setting after the evolution of the Cauarane-Coeroeni Belt ( 2.00 Ga), or may represent a post-collisional (or intracontinental?) magmatism related to orogenic activities along the plate margins around 1.95–1.94 Ga
publishDate 2009
dc.date.issued.fl_str_mv 2009
dc.date.accessioned.fl_str_mv 2013-12-19T16:32:42Z
dc.date.available.fl_str_mv 2013-12-19T16:32:42Z
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dc.identifier.citation.fl_str_mv FRAGA, Lêda Maria Barreto; MACAMBIRA, Moacir José Buenano; DALL’AGNOL, Roberto; COSTA, João Batista Sena Costa. 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications. Journal of South American Earth Sciences, Oxford, v.v. 27, n.4, p.247-257, Oxford.
dc.identifier.uri.fl_str_mv https://rigeo.cprm.gov.br/handle/doc/573
identifier_str_mv FRAGA, Lêda Maria Barreto; MACAMBIRA, Moacir José Buenano; DALL’AGNOL, Roberto; COSTA, João Batista Sena Costa. 1.94-1.93 Ga charnockitic magmatism from the central part of the Guyana Shield, Roraima, Brazil: Single-zircon evaporation data and tectonic implications. Journal of South American Earth Sciences, Oxford, v.v. 27, n.4, p.247-257, Oxford.
url https://rigeo.cprm.gov.br/handle/doc/573
dc.language.iso.fl_str_mv eng
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