Structural analysis at the southern end of the Central Precordillera of San Juan

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The Central Precordillera of San Juan is a thin-skinned fold and thrust belt bounded to the east by the thick-skinned structures of the Eastern Precordillera. The objective of this study is to describe and interpret the structural features found at the southern end of this fold and thrust belt. The...

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Autores principales: Giampaoli, P., Cegarra, M.I.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2003
Materias:
Deformation history
Fold and trusth belt
Folding description
Shortenig variation
Structural analysis
deformation
fault propagation
fold and thrust belt
structural analysis
thin skinned tectonics
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v58_n1_p49_Giampaoli
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_00044822_v58_n1_p49_Giampaoli2023-06-12T16:40:01Z Structural analysis at the southern end of the Central Precordillera of San Juan Rev. Asoc. Geol. Argent. 2003;58(1):49-60 Giampaoli, P. Cegarra, M.I. Deformation history Fold and trusth belt Folding description Shortenig variation Structural analysis deformation fault propagation fold and thrust belt structural analysis thin skinned tectonics Argentina The Central Precordillera of San Juan is a thin-skinned fold and thrust belt bounded to the east by the thick-skinned structures of the Eastern Precordillera. The objective of this study is to describe and interpret the structural features found at the southern end of this fold and thrust belt. The lomas de Andapaico's folds are of asymmetric, open chevron type, and are genetically related to fault propagation. Toward the north, the folding becomes tighter and broken by faults. The regional structure consists of an imbricated fan of an array of separated to overlapping fault propagation folds, and out-of-sequence structures related to the Eastern Precordillera uplift. The major décollement thrust is located near the top of the San Juan Formation limestone. Deformation occurred in two main stages. First, an imbricate array of fault-propagation folds was developed as the thrust front migrated toward the foreland. Then, the uplift of the eastern Precordillera impeded the migration of the thrust front and may have caused the development of out-of-sequence structures in the Central Precordillera. The minimum horizontal shortening calculated is 4.8 km, and the whole structure shows a southward decreasing shortening that is shown by structures of different orders and a variety of styles of deformation. Fil:Giampaoli, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cegarra, M.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2003 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v58_n1_p49_Giampaoli
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic Deformation history
Fold and trusth belt
Folding description
Shortenig variation
Structural analysis
deformation
fault propagation
fold and thrust belt
structural analysis
thin skinned tectonics
Argentina
spellingShingle Deformation history
Fold and trusth belt
Folding description
Shortenig variation
Structural analysis
deformation
fault propagation
fold and thrust belt
structural analysis
thin skinned tectonics
Argentina
Giampaoli, P.
Cegarra, M.I.
Structural analysis at the southern end of the Central Precordillera of San Juan
topic_facet Deformation history
Fold and trusth belt
Folding description
Shortenig variation
Structural analysis
deformation
fault propagation
fold and thrust belt
structural analysis
thin skinned tectonics
Argentina
description The Central Precordillera of San Juan is a thin-skinned fold and thrust belt bounded to the east by the thick-skinned structures of the Eastern Precordillera. The objective of this study is to describe and interpret the structural features found at the southern end of this fold and thrust belt. The lomas de Andapaico's folds are of asymmetric, open chevron type, and are genetically related to fault propagation. Toward the north, the folding becomes tighter and broken by faults. The regional structure consists of an imbricated fan of an array of separated to overlapping fault propagation folds, and out-of-sequence structures related to the Eastern Precordillera uplift. The major décollement thrust is located near the top of the San Juan Formation limestone. Deformation occurred in two main stages. First, an imbricate array of fault-propagation folds was developed as the thrust front migrated toward the foreland. Then, the uplift of the eastern Precordillera impeded the migration of the thrust front and may have caused the development of out-of-sequence structures in the Central Precordillera. The minimum horizontal shortening calculated is 4.8 km, and the whole structure shows a southward decreasing shortening that is shown by structures of different orders and a variety of styles of deformation.
format Artículo
Artículo
publishedVersion
author Giampaoli, P.
Cegarra, M.I.
author_facet Giampaoli, P.
Cegarra, M.I.
author_sort Giampaoli, P.
title Structural analysis at the southern end of the Central Precordillera of San Juan
title_short Structural analysis at the southern end of the Central Precordillera of San Juan
title_full Structural analysis at the southern end of the Central Precordillera of San Juan
title_fullStr Structural analysis at the southern end of the Central Precordillera of San Juan
title_full_unstemmed Structural analysis at the southern end of the Central Precordillera of San Juan
title_sort structural analysis at the southern end of the central precordillera of san juan
publishDate 2003
url http://hdl.handle.net/20.500.12110/paper_00044822_v58_n1_p49_Giampaoli
work_keys_str_mv AT giampaolip structuralanalysisatthesouthernendofthecentralprecordilleraofsanjuan
AT cegarrami structuralanalysisatthesouthernendofthecentralprecordilleraofsanjuan
_version_ 1769810059731140608

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