Pre-Andean and Andean Shortening in the Eastern Cordillera of NW Argentina at 23ºS

The Eastern Cordillera, in NW Argentina, is an imbricate thrust system involving Precambrian to Cenozoic stratigraphic units. Structural analysis shows that the Cretaceous unconformity truncates previous thrusts and related folds, but most of the Andean structures result from the reactivation of pre...

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Autores: Alonso Alonso, Juan Luis, Quintana, Luis, Gallastegui Suárez, Jorge|||0000-0002-3819-0183
Tipo de recurso: artículo
Fecha de publicación:2025
País:España
Institución:Universidad de Oviedo (UNIOVI)
Repositorio:RUO. Repositorio Institucional de la Universidad de Oviedo
Idioma:inglés
OAI Identifier:oai:digibuo.uniovi.es:10651/82299
Acceso en línea:https://hdl.handle.net/10651/82299
https://dx.doi.org/10.1016/j.jsames.2025.105809
Access Level:acceso abierto
Palabra clave:Eastern Cordillera
Pre-Andean deformation
Andean reactivation
Thrust and fold reactivation
Pre-Andean shortening
Andean shortening
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spelling Pre-Andean and Andean Shortening in the Eastern Cordillera of NW Argentina at 23ºSAlonso Alonso, Juan LuisQuintana, LuisGallastegui Suárez, Jorge|||0000-0002-3819-0183Eastern CordilleraPre-Andean deformationAndean reactivationThrust and fold reactivationPre-Andean shorteningAndean shorteningThe Eastern Cordillera, in NW Argentina, is an imbricate thrust system involving Precambrian to Cenozoic stratigraphic units. Structural analysis shows that the Cretaceous unconformity truncates previous thrusts and related folds, but most of the Andean structures result from the reactivation of pre-Andean thrusts and folds. The total shortening for the Eastern Cordillera is about 46 km, of which 30 km are Andean in age and about 16 km correspond to the original Paleozoic imbricate. A complete cross-section through the Eastern Cordillera and the Interandean Zone at 23◦S is presented and a sequential restoration of Andean and pre-Andean structures was carried out. In this section, two basement sheets, each about 10 km thick, have been inferred below the Eastern Cordillera from displacement transfer analysis. The thrust sequence was established on the basis of quantitative analysis of displacement transfer. The first basement sheet to be emplaced reactivated the floor thrust of the previous Paleozoic imbricate system, and accounts for the cumulative shortening of Andean thrusts in the Eastern Cordillera. The second one developed in forward sequence, transferring more than 60 km to the sole thrust of the Subandean imbricate system. It is the main thrust and gave rise to the uplift and deep exhumation of the primitive Eastern Cordillera, causing a fast increase in subsidence rates in the Subandean foreland basin. Later, a second movement of the first basement sheet transferred about 8 km of displacement towards several out-of-sequence thrusts, giving rise to the inter-montane Humahuaca Basin.20252025-12-15journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articlehttps://hdl.handle.net/10651/82299https://dx.doi.org/10.1016/j.jsames.2025.105809reponame:RUO. Repositorio Institucional de la Universidad de Oviedoinstname:Universidad de Oviedo (UNIOVI)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nd/4.0/info:eu-repo/semantics/openAccessoai:digibuo.uniovi.es:10651/822992026-06-07T06:38:51Z
dc.title.none.fl_str_mv Pre-Andean and Andean Shortening in the Eastern Cordillera of NW Argentina at 23ºS
title Pre-Andean and Andean Shortening in the Eastern Cordillera of NW Argentina at 23ºS
spellingShingle Pre-Andean and Andean Shortening in the Eastern Cordillera of NW Argentina at 23ºS
Alonso Alonso, Juan Luis
Eastern Cordillera
Pre-Andean deformation
Andean reactivation
Thrust and fold reactivation
Pre-Andean shortening
Andean shortening
title_short Pre-Andean and Andean Shortening in the Eastern Cordillera of NW Argentina at 23ºS
title_full Pre-Andean and Andean Shortening in the Eastern Cordillera of NW Argentina at 23ºS
title_fullStr Pre-Andean and Andean Shortening in the Eastern Cordillera of NW Argentina at 23ºS
title_full_unstemmed Pre-Andean and Andean Shortening in the Eastern Cordillera of NW Argentina at 23ºS
title_sort Pre-Andean and Andean Shortening in the Eastern Cordillera of NW Argentina at 23ºS
dc.creator.none.fl_str_mv Alonso Alonso, Juan Luis
Quintana, Luis
Gallastegui Suárez, Jorge|||0000-0002-3819-0183
author Alonso Alonso, Juan Luis
author_facet Alonso Alonso, Juan Luis
Quintana, Luis
Gallastegui Suárez, Jorge|||0000-0002-3819-0183
author_role author
author2 Quintana, Luis
Gallastegui Suárez, Jorge|||0000-0002-3819-0183
author2_role author
author
dc.subject.none.fl_str_mv Eastern Cordillera
Pre-Andean deformation
Andean reactivation
Thrust and fold reactivation
Pre-Andean shortening
Andean shortening
topic Eastern Cordillera
Pre-Andean deformation
Andean reactivation
Thrust and fold reactivation
Pre-Andean shortening
Andean shortening
description The Eastern Cordillera, in NW Argentina, is an imbricate thrust system involving Precambrian to Cenozoic stratigraphic units. Structural analysis shows that the Cretaceous unconformity truncates previous thrusts and related folds, but most of the Andean structures result from the reactivation of pre-Andean thrusts and folds. The total shortening for the Eastern Cordillera is about 46 km, of which 30 km are Andean in age and about 16 km correspond to the original Paleozoic imbricate. A complete cross-section through the Eastern Cordillera and the Interandean Zone at 23◦S is presented and a sequential restoration of Andean and pre-Andean structures was carried out. In this section, two basement sheets, each about 10 km thick, have been inferred below the Eastern Cordillera from displacement transfer analysis. The thrust sequence was established on the basis of quantitative analysis of displacement transfer. The first basement sheet to be emplaced reactivated the floor thrust of the previous Paleozoic imbricate system, and accounts for the cumulative shortening of Andean thrusts in the Eastern Cordillera. The second one developed in forward sequence, transferring more than 60 km to the sole thrust of the Subandean imbricate system. It is the main thrust and gave rise to the uplift and deep exhumation of the primitive Eastern Cordillera, causing a fast increase in subsidence rates in the Subandean foreland basin. Later, a second movement of the first basement sheet transferred about 8 km of displacement towards several out-of-sequence thrusts, giving rise to the inter-montane Humahuaca Basin.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-12-15
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/10651/82299
https://dx.doi.org/10.1016/j.jsames.2025.105809
url https://hdl.handle.net/10651/82299
https://dx.doi.org/10.1016/j.jsames.2025.105809
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nd/4.0/
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:RUO. Repositorio Institucional de la Universidad de Oviedo
instname:Universidad de Oviedo (UNIOVI)
instname_str Universidad de Oviedo (UNIOVI)
reponame_str RUO. Repositorio Institucional de la Universidad de Oviedo
collection RUO. Repositorio Institucional de la Universidad de Oviedo
repository.name.fl_str_mv
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