Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil

Detalhes bibliográficos
Autor(a) principal: ARCHANJO, Carlos J.
Data de Publicação: 2008
Outros Autores: HOLLANDA, Maria Helena B. M., RODRIGUES, Sérgio Willians de Oliveira, BRITO NEVES, Benjamim Bley de, ARMSTRONG, Richard
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional de Geociências - RIGEO
Texto Completo: https://rigeo.cprm.gov.br/handle/doc/555
Resumo: We used the fabrics of two granite plutons and U/Pb (SHRIMP) zircon ages to constrain the tectonic evolution of the E-trending Patos shear zone (Borborema Province, NE Brazil). The pre-tectonic Teixeira batholith consists of an amphibole leucogranite locally with aegirine-augite. Zircons from a syenogranite yielded crystallization ages of 591 5 Ma. The batholith fabrics were determined by anisotropy of magnetic susceptibility (AMS) and mineral shape preferred orientation. The fabrics support pre-transcurrent batholith emplacement, as evidenced by: (i) magmatic/ magnetic fabrics in low susceptibility (0.35 mSI) leucogranites highly discordant to the regional host rock structure, and (ii) concordant magnetic fabrics restricted to high susceptibility (1 mSI) corridors connected to shear zones branching off from Patos. One of these satellite shear zones controlled the syntectonic emplacement of the Serra Redonda pluton, which yields a crystallization age of 576 3 Ma. This late shearing event marks the peak regional deformation that, south of Patos, was coupled to crustal shortening nearly perpendicular to the shear belt. The chronology of the deformational events indicates that the major shear zones of the eastern Borborema are late structures active after the crustal blocks amalgamated
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spelling ARCHANJO, Carlos J.HOLLANDA, Maria Helena B. M.RODRIGUES, Sérgio Willians de OliveiraBRITO NEVES, Benjamim Bley deARMSTRONG, Richard2013-12-19T16:32:40Z2013-12-19T16:32:40Z2008ARCHANJO, Carlos J; HOLLANDA, Maria Helena B. M; RODRIGUES, Sérgio Willians de Oliveira; BRITO NEVES, Benjamim Bley de; ARMSTRONG, Richard. Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil. Journal of Structural Geology, New York, v.30, n.3, p.310-336.01918141https://rigeo.cprm.gov.br/handle/doc/555We used the fabrics of two granite plutons and U/Pb (SHRIMP) zircon ages to constrain the tectonic evolution of the E-trending Patos shear zone (Borborema Province, NE Brazil). The pre-tectonic Teixeira batholith consists of an amphibole leucogranite locally with aegirine-augite. Zircons from a syenogranite yielded crystallization ages of 591 5 Ma. The batholith fabrics were determined by anisotropy of magnetic susceptibility (AMS) and mineral shape preferred orientation. The fabrics support pre-transcurrent batholith emplacement, as evidenced by: (i) magmatic/ magnetic fabrics in low susceptibility (0.35 mSI) leucogranites highly discordant to the regional host rock structure, and (ii) concordant magnetic fabrics restricted to high susceptibility (1 mSI) corridors connected to shear zones branching off from Patos. One of these satellite shear zones controlled the syntectonic emplacement of the Serra Redonda pluton, which yields a crystallization age of 576 3 Ma. This late shearing event marks the peak regional deformation that, south of Patos, was coupled to crustal shortening nearly perpendicular to the shear belt. The chronology of the deformational events indicates that the major shear zones of the eastern Borborema are late structures active after the crustal blocks amalgamatedGEOCRONOLOGIATECTÔNICABORBOREMABRASILFabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazilinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleNew Yorkengreponame:Repositório Institucional de Geociências - RIGEOinstname:Companhia de Pesquisa de Recursos Minerais (CPRM)instacron:CPRMinfo:eu-repo/semantics/openAccessTEXTart_archanjo_holanda.pdf.txtart_archanjo_holanda.pdf.txtExtracted texttext/plain69220http://rigeo.cprm.gov.br/jspui/bitstream/doc/555/2/art_archanjo_holanda.pdf.txtf42a23fce682320b86ded21c1242119cMD52THUMBNAILart_archanjo_holanda.pdf.jpgart_archanjo_holanda.pdf.jpgGenerated Thumbnailimage/jpeg1720http://rigeo.cprm.gov.br/jspui/bitstream/doc/555/3/art_archanjo_holanda.pdf.jpgac95a01818949331fada8e58fb348670MD53ORIGINALart_archanjo_holanda.pdfart_archanjo_holanda.pdfproducao cientificaapplication/pdf1746562http://rigeo.cprm.gov.br/jspui/bitstream/doc/555/1/art_archanjo_holanda.pdf0248d7e591f5362ee24045734c75f752MD51doc/5552023-02-13 11:10:40.104oai:rigeo.sgb.gov.br:doc/555Repositório InstitucionalONGhttp://rigeo.cprm.gov.br/oai/requestrigeo@sgb.gov.bropendoar:2023-02-13T14:10:40Repositório Institucional de Geociências - RIGEO - Companhia de Pesquisa de Recursos Minerais (CPRM)false
dc.title.none.fl_str_mv Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil
title Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil
spellingShingle Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil
ARCHANJO, Carlos J.
GEOCRONOLOGIA
TECTÔNICA
BORBOREMA
BRASIL
title_short Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil
title_full Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil
title_fullStr Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil
title_full_unstemmed Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil
title_sort Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil
author ARCHANJO, Carlos J.
author_facet ARCHANJO, Carlos J.
HOLLANDA, Maria Helena B. M.
RODRIGUES, Sérgio Willians de Oliveira
BRITO NEVES, Benjamim Bley de
ARMSTRONG, Richard
author_role author
author2 HOLLANDA, Maria Helena B. M.
RODRIGUES, Sérgio Willians de Oliveira
BRITO NEVES, Benjamim Bley de
ARMSTRONG, Richard
author2_role author
author
author
author
dc.contributor.author.fl_str_mv ARCHANJO, Carlos J.
HOLLANDA, Maria Helena B. M.
RODRIGUES, Sérgio Willians de Oliveira
BRITO NEVES, Benjamim Bley de
ARMSTRONG, Richard
dc.subject.por.fl_str_mv GEOCRONOLOGIA
TECTÔNICA
BORBOREMA
BRASIL
topic GEOCRONOLOGIA
TECTÔNICA
BORBOREMA
BRASIL
description We used the fabrics of two granite plutons and U/Pb (SHRIMP) zircon ages to constrain the tectonic evolution of the E-trending Patos shear zone (Borborema Province, NE Brazil). The pre-tectonic Teixeira batholith consists of an amphibole leucogranite locally with aegirine-augite. Zircons from a syenogranite yielded crystallization ages of 591 5 Ma. The batholith fabrics were determined by anisotropy of magnetic susceptibility (AMS) and mineral shape preferred orientation. The fabrics support pre-transcurrent batholith emplacement, as evidenced by: (i) magmatic/ magnetic fabrics in low susceptibility (0.35 mSI) leucogranites highly discordant to the regional host rock structure, and (ii) concordant magnetic fabrics restricted to high susceptibility (1 mSI) corridors connected to shear zones branching off from Patos. One of these satellite shear zones controlled the syntectonic emplacement of the Serra Redonda pluton, which yields a crystallization age of 576 3 Ma. This late shearing event marks the peak regional deformation that, south of Patos, was coupled to crustal shortening nearly perpendicular to the shear belt. The chronology of the deformational events indicates that the major shear zones of the eastern Borborema are late structures active after the crustal blocks amalgamated
publishDate 2008
dc.date.issued.fl_str_mv 2008
dc.date.accessioned.fl_str_mv 2013-12-19T16:32:40Z
dc.date.available.fl_str_mv 2013-12-19T16:32:40Z
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dc.identifier.citation.fl_str_mv ARCHANJO, Carlos J; HOLLANDA, Maria Helena B. M; RODRIGUES, Sérgio Willians de Oliveira; BRITO NEVES, Benjamim Bley de; ARMSTRONG, Richard. Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil. Journal of Structural Geology, New York, v.30, n.3, p.310-336.
dc.identifier.uri.fl_str_mv https://rigeo.cprm.gov.br/handle/doc/555
dc.identifier.issn.none.fl_str_mv 01918141
identifier_str_mv ARCHANJO, Carlos J; HOLLANDA, Maria Helena B. M; RODRIGUES, Sérgio Willians de Oliveira; BRITO NEVES, Benjamim Bley de; ARMSTRONG, Richard. Fabrics of pre- and syntectonic granite plutons and chronology of shear zones in the Eastern Borborema Province, NE Brazil. Journal of Structural Geology, New York, v.30, n.3, p.310-336.
01918141
url https://rigeo.cprm.gov.br/handle/doc/555
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