Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera

Autores
Alonso, J. L.; Gallastegui, J.; García Sansegundo, J.; Farias, P.; Rodríguez Fernández, L. R.; Ramos, Victor Alberto
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The paper describes ubiquitous extensional structures developed in a passive margin of Ordovician age in the Argentine Precordillera. These extensional structures include normal faults and boudinaged sequences. In some places the boudinage reaches very high extension values, giving rise to block-in-matrix formations. Most of these extensional structures developed when sediments were not well lithified, as recorded by hydroplastic fractures, slump folds and pinch-and-swell structures. The presence of slump folds coeval with the extensional deformation, the variable extension directions obtained from the kinematic analysis and a weak cleavage recording layer-perpendicular shortening support the interpretation that gravitational collapse related to submarine sliding was the cause for extensional deformation. Well-consolidated rocks, located at the lower part of the stratigraphic sequence, also display scarce extensional faults. These extensional faults predate folding because they were breached by flexural-slip faults and, as a result of their passive rotation in fold limbs, these initial normal faults may now appear as reverse faults, particularly in steep and overturned limbs. The truncation of extensional faults by flexural-slip faults produces typical bed thickness changes across the extensional faults, giving rise to apparent synsedimentary faults. These normal faults can be attributed to the crustal extension that generated the passive continental margin or may represent deep parts of faults related to gravitational collapse.
Fil: Alonso, J.L.. Universidad de Oviedo; España
Fil: Gallastegui, J.. Universidad de Oviedo; España
Fil: García-Sansegundo, J.. Universidad de Oviedo; España
Fil: Farias, P.. Universidad de Oviedo; España
Fil: Fernández, L.R. Rodríguez. Instituto Geológico y Minero de España; España
Fil: Ramos, Victor Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Materia
ARGENTINE PRECORDILLERA
EXTENSIONAL TECTONICS
GONDWANA
ORDOVICIAN
SUBMARINE SLIDING
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/92732
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/92732
network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine PrecordilleraAlonso, J. L.Gallastegui, J.García Sansegundo, J.Farias, P.Rodríguez Fernández, L. R.Ramos, Victor AlbertoARGENTINE PRECORDILLERAEXTENSIONAL TECTONICSGONDWANAORDOVICIANSUBMARINE SLIDINGhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The paper describes ubiquitous extensional structures developed in a passive margin of Ordovician age in the Argentine Precordillera. These extensional structures include normal faults and boudinaged sequences. In some places the boudinage reaches very high extension values, giving rise to block-in-matrix formations. Most of these extensional structures developed when sediments were not well lithified, as recorded by hydroplastic fractures, slump folds and pinch-and-swell structures. The presence of slump folds coeval with the extensional deformation, the variable extension directions obtained from the kinematic analysis and a weak cleavage recording layer-perpendicular shortening support the interpretation that gravitational collapse related to submarine sliding was the cause for extensional deformation. Well-consolidated rocks, located at the lower part of the stratigraphic sequence, also display scarce extensional faults. These extensional faults predate folding because they were breached by flexural-slip faults and, as a result of their passive rotation in fold limbs, these initial normal faults may now appear as reverse faults, particularly in steep and overturned limbs. The truncation of extensional faults by flexural-slip faults produces typical bed thickness changes across the extensional faults, giving rise to apparent synsedimentary faults. These normal faults can be attributed to the crustal extension that generated the passive continental margin or may represent deep parts of faults related to gravitational collapse.Fil: Alonso, J.L.. Universidad de Oviedo; EspañaFil: Gallastegui, J.. Universidad de Oviedo; EspañaFil: García-Sansegundo, J.. Universidad de Oviedo; EspañaFil: Farias, P.. Universidad de Oviedo; EspañaFil: Fernández, L.R. Rodríguez. Instituto Geológico y Minero de España; EspañaFil: Ramos, Victor Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaElsevier Science2008-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/92732Alonso, J. L.; Gallastegui, J.; García Sansegundo, J.; Farias, P.; Rodríguez Fernández, L. R. ; et al.; Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera; Elsevier Science; Gondwana Research; 13; 2; 3-2008; 204-2151342-937XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2007.05.014info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S1342937X07000986?via%3Dihubinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:57:23Zoai:ri.conicet.gov.ar:11336/92732instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:57:23.976CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera
title Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera
spellingShingle Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera
Alonso, J. L.
ARGENTINE PRECORDILLERA
EXTENSIONAL TECTONICS
GONDWANA
ORDOVICIAN
SUBMARINE SLIDING
title_short Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera
title_full Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera
title_fullStr Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera
title_full_unstemmed Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera
title_sort Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera
dc.creator.none.fl_str_mv Alonso, J. L.
Gallastegui, J.
García Sansegundo, J.
Farias, P.
Rodríguez Fernández, L. R.
Ramos, Victor Alberto
author Alonso, J. L.
author_facet Alonso, J. L.
Gallastegui, J.
García Sansegundo, J.
Farias, P.
Rodríguez Fernández, L. R.
Ramos, Victor Alberto
author_role author
author2 Gallastegui, J.
García Sansegundo, J.
Farias, P.
Rodríguez Fernández, L. R.
Ramos, Victor Alberto
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv ARGENTINE PRECORDILLERA
EXTENSIONAL TECTONICS
GONDWANA
ORDOVICIAN
SUBMARINE SLIDING
topic ARGENTINE PRECORDILLERA
EXTENSIONAL TECTONICS
GONDWANA
ORDOVICIAN
SUBMARINE SLIDING
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The paper describes ubiquitous extensional structures developed in a passive margin of Ordovician age in the Argentine Precordillera. These extensional structures include normal faults and boudinaged sequences. In some places the boudinage reaches very high extension values, giving rise to block-in-matrix formations. Most of these extensional structures developed when sediments were not well lithified, as recorded by hydroplastic fractures, slump folds and pinch-and-swell structures. The presence of slump folds coeval with the extensional deformation, the variable extension directions obtained from the kinematic analysis and a weak cleavage recording layer-perpendicular shortening support the interpretation that gravitational collapse related to submarine sliding was the cause for extensional deformation. Well-consolidated rocks, located at the lower part of the stratigraphic sequence, also display scarce extensional faults. These extensional faults predate folding because they were breached by flexural-slip faults and, as a result of their passive rotation in fold limbs, these initial normal faults may now appear as reverse faults, particularly in steep and overturned limbs. The truncation of extensional faults by flexural-slip faults produces typical bed thickness changes across the extensional faults, giving rise to apparent synsedimentary faults. These normal faults can be attributed to the crustal extension that generated the passive continental margin or may represent deep parts of faults related to gravitational collapse.
Fil: Alonso, J.L.. Universidad de Oviedo; España
Fil: Gallastegui, J.. Universidad de Oviedo; España
Fil: García-Sansegundo, J.. Universidad de Oviedo; España
Fil: Farias, P.. Universidad de Oviedo; España
Fil: Fernández, L.R. Rodríguez. Instituto Geológico y Minero de España; España
Fil: Ramos, Victor Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
description The paper describes ubiquitous extensional structures developed in a passive margin of Ordovician age in the Argentine Precordillera. These extensional structures include normal faults and boudinaged sequences. In some places the boudinage reaches very high extension values, giving rise to block-in-matrix formations. Most of these extensional structures developed when sediments were not well lithified, as recorded by hydroplastic fractures, slump folds and pinch-and-swell structures. The presence of slump folds coeval with the extensional deformation, the variable extension directions obtained from the kinematic analysis and a weak cleavage recording layer-perpendicular shortening support the interpretation that gravitational collapse related to submarine sliding was the cause for extensional deformation. Well-consolidated rocks, located at the lower part of the stratigraphic sequence, also display scarce extensional faults. These extensional faults predate folding because they were breached by flexural-slip faults and, as a result of their passive rotation in fold limbs, these initial normal faults may now appear as reverse faults, particularly in steep and overturned limbs. The truncation of extensional faults by flexural-slip faults produces typical bed thickness changes across the extensional faults, giving rise to apparent synsedimentary faults. These normal faults can be attributed to the crustal extension that generated the passive continental margin or may represent deep parts of faults related to gravitational collapse.
publishDate 2008
dc.date.none.fl_str_mv 2008-03
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/92732
Alonso, J. L.; Gallastegui, J.; García Sansegundo, J.; Farias, P.; Rodríguez Fernández, L. R. ; et al.; Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera; Elsevier Science; Gondwana Research; 13; 2; 3-2008; 204-215
1342-937X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/92732
identifier_str_mv Alonso, J. L.; Gallastegui, J.; García Sansegundo, J.; Farias, P.; Rodríguez Fernández, L. R. ; et al.; Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera; Elsevier Science; Gondwana Research; 13; 2; 3-2008; 204-215
1342-937X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2007.05.014
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S1342937X07000986?via%3Dihub
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1842269460082196480
score 13.13397

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