Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression

Detalhes bibliográficos
Autor(a) principal: Kholaiq, Mariame
Data de Publicação: 2017
Outros Autores: Saber, Najib, Dias, Rui, Zahour, Ghalem, Soares, Alexis
Tipo de documento: Artigo de conferência
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/22943
Resumo: The Rehamna Paleozoic block is one of the major domains in the Moroccan Variscides. Although strongly studied since the classical fundamental works of Piqué (1972), Hoepffner (1974), Jenny (1974), and Michard (1976) there is no a geodynamical model able to compatibilize the observed deformation in all the Rehamna sectors. The three deformation phases recently defended (e.g. Chopin et al., 2014; Wernert et al., 2016) although explains the structural pattern of the meridional Rehamna sectors didn't fit well, either with the setentrional sector, or the Moroccan geodynamics, where a major N-S early compression is not common. The available data concerning the D1 structures shows that the NNE-SSW to N-S stretching lineations related to the D1 southward thrusting, which is well expressed in the western sectors, have an E-W general trend in the East of the Palaeozoic massif (Chopin, et al., 2014). This pattern shows that the thrusting kinematics is only a localized feature at the Rehamna scale. Thus it is possible to propose that the general dextral transpression along ENE-WSW trend that have emphasize in other sectors of Moroccan Variscides (e.g. Houari & Hoepffner, 2000; Dias et al., 2011) could also explain the Rehamna complex deformation. Due to a strong strain partitioning, the dextral kinematics tend to concentrate in the vicinity of major EW to ENE-WSW (e.g. AïnMellah Fault) while in the adjacent blocks a pure shear dominated transpression dominate, explaining the NNE-SSW to N-S pervasive folding at the Rehamna scale. In such a model, the southward D1thrusting and the E-W D2 folding (Chopin, et al., 2014; Wernert, et al., 2016) are the result of a corner effect related to space problems induced by the Neoproterozoic basement of Central Rehamna. Its stronger rheology give rise to a restraining problem leading the Ordovician of the Upper Metamorphic Unit to overlap the higher metamorphic southern sectors. The thrusting component decreases towards East where the sub-horizontal D1 and D2 mineral lineations predominate as expected in a dextral transpression. This shows that the dextral oblique collision between Laurentia and Baltica during tardi-Variscan deformation (Arthaud & Matte, 1975) is a long lasting deformation in the Moroccan Variscides.
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spelling Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpressionVariscan orogenyMoroccoRehamna MassifThe Rehamna Paleozoic block is one of the major domains in the Moroccan Variscides. Although strongly studied since the classical fundamental works of Piqué (1972), Hoepffner (1974), Jenny (1974), and Michard (1976) there is no a geodynamical model able to compatibilize the observed deformation in all the Rehamna sectors. The three deformation phases recently defended (e.g. Chopin et al., 2014; Wernert et al., 2016) although explains the structural pattern of the meridional Rehamna sectors didn't fit well, either with the setentrional sector, or the Moroccan geodynamics, where a major N-S early compression is not common. The available data concerning the D1 structures shows that the NNE-SSW to N-S stretching lineations related to the D1 southward thrusting, which is well expressed in the western sectors, have an E-W general trend in the East of the Palaeozoic massif (Chopin, et al., 2014). This pattern shows that the thrusting kinematics is only a localized feature at the Rehamna scale. Thus it is possible to propose that the general dextral transpression along ENE-WSW trend that have emphasize in other sectors of Moroccan Variscides (e.g. Houari & Hoepffner, 2000; Dias et al., 2011) could also explain the Rehamna complex deformation. Due to a strong strain partitioning, the dextral kinematics tend to concentrate in the vicinity of major EW to ENE-WSW (e.g. AïnMellah Fault) while in the adjacent blocks a pure shear dominated transpression dominate, explaining the NNE-SSW to N-S pervasive folding at the Rehamna scale. In such a model, the southward D1thrusting and the E-W D2 folding (Chopin, et al., 2014; Wernert, et al., 2016) are the result of a corner effect related to space problems induced by the Neoproterozoic basement of Central Rehamna. Its stronger rheology give rise to a restraining problem leading the Ordovician of the Upper Metamorphic Unit to overlap the higher metamorphic southern sectors. The thrusting component decreases towards East where the sub-horizontal D1 and D2 mineral lineations predominate as expected in a dextral transpression. This shows that the dextral oblique collision between Laurentia and Baltica during tardi-Variscan deformation (Arthaud & Matte, 1975) is a long lasting deformation in the Moroccan Variscides.Academic and Scientific Research Organization2018-03-12T18:20:09Z2018-03-122017-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/22943http://hdl.handle.net/10174/22943engKholaiq, M., Dias, R., Saber, N., Zahour, G. Soares, A. (2017) - "Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression". In: First International ASRO Geological Congress [ASRO-GC-2017], El Jadida, Marroco.simnaonaokholaiq.mariame@gmail.comnajib_saber@yahoo.frrdias@uevora.ptndasoares@estremoz.cienciaviva.pt250Kholaiq, MariameSaber, NajibDias, RuiZahour, GhalemSoares, Alexisinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:14:23Zoai:dspace.uevora.pt:10174/22943Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:13:45.837293Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression
title Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression
spellingShingle Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression
Kholaiq, Mariame
Variscan orogeny
Morocco
Rehamna Massif
title_short Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression
title_full Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression
title_fullStr Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression
title_full_unstemmed Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression
title_sort Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression
author Kholaiq, Mariame
author_facet Kholaiq, Mariame
Saber, Najib
Dias, Rui
Zahour, Ghalem
Soares, Alexis
author_role author
author2 Saber, Najib
Dias, Rui
Zahour, Ghalem
Soares, Alexis
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Kholaiq, Mariame
Saber, Najib
Dias, Rui
Zahour, Ghalem
Soares, Alexis
dc.subject.por.fl_str_mv Variscan orogeny
Morocco
Rehamna Massif
topic Variscan orogeny
Morocco
Rehamna Massif
description The Rehamna Paleozoic block is one of the major domains in the Moroccan Variscides. Although strongly studied since the classical fundamental works of Piqué (1972), Hoepffner (1974), Jenny (1974), and Michard (1976) there is no a geodynamical model able to compatibilize the observed deformation in all the Rehamna sectors. The three deformation phases recently defended (e.g. Chopin et al., 2014; Wernert et al., 2016) although explains the structural pattern of the meridional Rehamna sectors didn't fit well, either with the setentrional sector, or the Moroccan geodynamics, where a major N-S early compression is not common. The available data concerning the D1 structures shows that the NNE-SSW to N-S stretching lineations related to the D1 southward thrusting, which is well expressed in the western sectors, have an E-W general trend in the East of the Palaeozoic massif (Chopin, et al., 2014). This pattern shows that the thrusting kinematics is only a localized feature at the Rehamna scale. Thus it is possible to propose that the general dextral transpression along ENE-WSW trend that have emphasize in other sectors of Moroccan Variscides (e.g. Houari & Hoepffner, 2000; Dias et al., 2011) could also explain the Rehamna complex deformation. Due to a strong strain partitioning, the dextral kinematics tend to concentrate in the vicinity of major EW to ENE-WSW (e.g. AïnMellah Fault) while in the adjacent blocks a pure shear dominated transpression dominate, explaining the NNE-SSW to N-S pervasive folding at the Rehamna scale. In such a model, the southward D1thrusting and the E-W D2 folding (Chopin, et al., 2014; Wernert, et al., 2016) are the result of a corner effect related to space problems induced by the Neoproterozoic basement of Central Rehamna. Its stronger rheology give rise to a restraining problem leading the Ordovician of the Upper Metamorphic Unit to overlap the higher metamorphic southern sectors. The thrusting component decreases towards East where the sub-horizontal D1 and D2 mineral lineations predominate as expected in a dextral transpression. This shows that the dextral oblique collision between Laurentia and Baltica during tardi-Variscan deformation (Arthaud & Matte, 1975) is a long lasting deformation in the Moroccan Variscides.
publishDate 2017
dc.date.none.fl_str_mv 2017-01-01T00:00:00Z
2018-03-12T18:20:09Z
2018-03-12
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/22943
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url http://hdl.handle.net/10174/22943
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Kholaiq, M., Dias, R., Saber, N., Zahour, G. Soares, A. (2017) - "Polyphased Variscan deformation in the Rehamna Massif: strong strain partitioning in dextral transpression". In: First International ASRO Geological Congress [ASRO-GC-2017], El Jadida, Marroco.
sim
nao
nao
kholaiq.mariame@gmail.com
najib_saber@yahoo.fr
rdias@uevora.pt
nd
asoares@estremoz.cienciaviva.pt
250
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publisher.none.fl_str_mv Academic and Scientific Research Organization
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