Development of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases

Detalhes bibliográficos
Autor(a) principal: Gomes, L. C. Correa
Data de Publicação: 2001
Outros Autores: Souza Filho, Carlos Roberto, Martins, C. J. F. N., Oliveira, E. P.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/7674
Resumo: Texto completo: acesso restrito. p. 1415–1428
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spelling Gomes, L. C. CorreaSouza Filho, Carlos RobertoMartins, C. J. F. N.Oliveira, E. P.Gomes, L. C. CorreaSouza Filho, Carlos RobertoMartins, C. J. F. N.Oliveira, E. P.2012-12-19T17:16:28Z20010191-8141http://www.repositorio.ufba.br/ri/handle/ri/7674v. 23, n. 9Texto completo: acesso restrito. p. 1415–1428Two orientations of fabrics are recognised in vertical dykes: a symmetric orientation associated with magma injected into non-deforming wall-rocks and an asymmetric orientation usually associated with external non-coaxial shearing, or magma injected into an active fault. The notion of two fabric arrangements stems from two planes of symmetry, the dyke symmetry plane (DSP) and the fabric symmetry plane (FSP). This paper uses conceptual models to simulate all possible orientations of magma flow indicators that might be produced within a vertical dyke emplaced under coeval internal and external stresses. The effect of magmatic buoyancy-related stresses are portrayed in terms of magma flow velocities (MFV) and the external non-coaxial tectonic-related stresses in terms of wall displacement velocities divided by two (WMV/2). The tectonic setting is that of a sinistral transcurrent fault. Using these assumptions, five cases are proposed: MFV⪢WDV/2, MFV>WDV/2, MFV=WDV/2, MFV<WDV/2 and MFV⪡WDV/2. Each of theses cases shows distinct obliquities between the DSP and FSP (to the extent that the latter can be depicted) and distinct angular relations between strikes of dyke walls and fabric ellipsoids. The model was tested on Neoproterozoic alkaline dykes hosted within the Itabuna–Itaju do Colonia Shear Zone (Brazil). Comparisons of what our model predicted with what we observed in the field showed a striking equivalence.Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2012-12-19T17:16:28Z No. of bitstreams: 1 1-s2.0-S0191814101000074-main.pdf: 534335 bytes, checksum: 0649ad788876126d7df4a605bfdb8d9d (MD5)Made available in DSpace on 2012-12-19T17:16:28Z (GMT). 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dc.title.pt_BR.fl_str_mv Development of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases
dc.title.alternative.pt_BR.fl_str_mv Journal of Structural Geology
title Development of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases
spellingShingle Development of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases
Gomes, L. C. Correa
title_short Development of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases
title_full Development of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases
title_fullStr Development of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases
title_full_unstemmed Development of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases
title_sort Development of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases
author Gomes, L. C. Correa
author_facet Gomes, L. C. Correa
Souza Filho, Carlos Roberto
Martins, C. J. F. N.
Oliveira, E. P.
author_role author
author2 Souza Filho, Carlos Roberto
Martins, C. J. F. N.
Oliveira, E. P.
author2_role author
author
author
dc.contributor.author.fl_str_mv Gomes, L. C. Correa
Souza Filho, Carlos Roberto
Martins, C. J. F. N.
Oliveira, E. P.
Gomes, L. C. Correa
Souza Filho, Carlos Roberto
Martins, C. J. F. N.
Oliveira, E. P.
description Texto completo: acesso restrito. p. 1415–1428
publishDate 2001
dc.date.issued.fl_str_mv 2001
dc.date.accessioned.fl_str_mv 2012-12-19T17:16:28Z
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 http://www.repositorio.ufba.br/ri/handle/ri/7674
dc.identifier.issn.none.fl_str_mv 0191-8141
dc.identifier.number.pt_BR.fl_str_mv v. 23, n. 9
identifier_str_mv 0191-8141
v. 23, n. 9
url http://www.repositorio.ufba.br/ri/handle/ri/7674
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.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/S0191-8141(01)00007-4
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