Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile

Autores
González Vidal, Roberto; Tapia, Felipe; Barcia Poblete, Fernando Andrés; Peña, Matías; Salazar, Esteban; Ríos, Valentina
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Navarino Island is located in the southernmost part of South America, within the Central Belt of the Fuegian Orogen. The shortening of the geological units observed on the island is believed to be related to a compressional event during the closure of the Rocas Verdes Basin. However, the full extent of this relationship remains unclear due to accessibility challenges and the apparent change in the stratigraphic records both north and south of the Beagle Channel. In this study, we integrate anisotropy of magnetic susceptibility (AMS) with structural observations across turbiditic sandstones and mudstones from the Lower Cretaceous Yahgan Formation. We analyzed thirty new sampling sites located along the northern coast of the island and the Dientes de Navarino mountain group. The AMS data exhibited predominantly oblate magnetic fabrics, with P’ values ranging from 1.02 to 2.22. The ellipsoid orientations correlated well with the structural features, particularly cleavage (S1) and fold axes. High P’ values and tectonic fabric types were concentrated in the western part of the island. A transition from a tectonic fabric with lower anisotropy degrees to a more sedimentary fabric was observed towards the east and south. These findings reflect a W-E deformation gradient consistent with the island´s structural features, including an overprinting cleavage family (S2) restricted to the island’s northwest. This study highlights the utility of AMS in elucidating strain directions and reconstructing deformation histories in complex orogenic settings.
Fil: González Vidal, Roberto. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geología; Chile
Fil: Tapia, Felipe. 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. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; Argentina
Fil: Barcia Poblete, Fernando Andrés. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geología; Chile
Fil: Peña, Matías. Universidad de Chile; Chile
Fil: Salazar, Esteban. Servicio Nacional de Geología y Minería; Chile
Fil: Ríos, Valentina. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geología; Chile
Materia
FUEGUIEAN ANDES
ESTRUCTURAL
PALEOMAGNETISM
TIERRRA DEL FUEGO
Nivel de accesibilidad
acceso embargado
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:11336/277933
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, ChileGonzález Vidal, RobertoTapia, FelipeBarcia Poblete, Fernando AndrésPeña, MatíasSalazar, EstebanRíos, ValentinaFUEGUIEAN ANDESESTRUCTURALPALEOMAGNETISMTIERRRA DEL FUEGOhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Navarino Island is located in the southernmost part of South America, within the Central Belt of the Fuegian Orogen. The shortening of the geological units observed on the island is believed to be related to a compressional event during the closure of the Rocas Verdes Basin. However, the full extent of this relationship remains unclear due to accessibility challenges and the apparent change in the stratigraphic records both north and south of the Beagle Channel. In this study, we integrate anisotropy of magnetic susceptibility (AMS) with structural observations across turbiditic sandstones and mudstones from the Lower Cretaceous Yahgan Formation. We analyzed thirty new sampling sites located along the northern coast of the island and the Dientes de Navarino mountain group. The AMS data exhibited predominantly oblate magnetic fabrics, with P’ values ranging from 1.02 to 2.22. The ellipsoid orientations correlated well with the structural features, particularly cleavage (S1) and fold axes. High P’ values and tectonic fabric types were concentrated in the western part of the island. A transition from a tectonic fabric with lower anisotropy degrees to a more sedimentary fabric was observed towards the east and south. These findings reflect a W-E deformation gradient consistent with the island´s structural features, including an overprinting cleavage family (S2) restricted to the island’s northwest. This study highlights the utility of AMS in elucidating strain directions and reconstructing deformation histories in complex orogenic settings.Fil: González Vidal, Roberto. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geología; ChileFil: Tapia, Felipe. 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. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; ArgentinaFil: Barcia Poblete, Fernando Andrés. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geología; ChileFil: Peña, Matías. Universidad de Chile; ChileFil: Salazar, Esteban. Servicio Nacional de Geología y Minería; ChileFil: Ríos, Valentina. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geología; ChilePergamon-Elsevier Science Ltd2025-12info:eu-repo/date/embargoEnd/2026-07-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/277933González Vidal, Roberto; Tapia, Felipe; Barcia Poblete, Fernando Andrés; Peña, Matías; Salazar, Esteban; et al.; Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 170; 12-2025; 1-420895-9811CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0895981125005619info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2025.105899info:eu-repo/semantics/embargoedAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-12-23T13:55:15Zoai:ri.conicet.gov.ar:11336/277933instacron: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:34982025-12-23 13:55:15.469CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile
title Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile
spellingShingle Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile
González Vidal, Roberto
FUEGUIEAN ANDES
ESTRUCTURAL
PALEOMAGNETISM
TIERRRA DEL FUEGO
title_short Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile
title_full Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile
title_fullStr Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile
title_full_unstemmed Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile
title_sort Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile
dc.creator.none.fl_str_mv González Vidal, Roberto
Tapia, Felipe
Barcia Poblete, Fernando Andrés
Peña, Matías
Salazar, Esteban
Ríos, Valentina
author González Vidal, Roberto
author_facet González Vidal, Roberto
Tapia, Felipe
Barcia Poblete, Fernando Andrés
Peña, Matías
Salazar, Esteban
Ríos, Valentina
author_role author
author2 Tapia, Felipe
Barcia Poblete, Fernando Andrés
Peña, Matías
Salazar, Esteban
Ríos, Valentina
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv FUEGUIEAN ANDES
ESTRUCTURAL
PALEOMAGNETISM
TIERRRA DEL FUEGO
topic FUEGUIEAN ANDES
ESTRUCTURAL
PALEOMAGNETISM
TIERRRA DEL FUEGO
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Navarino Island is located in the southernmost part of South America, within the Central Belt of the Fuegian Orogen. The shortening of the geological units observed on the island is believed to be related to a compressional event during the closure of the Rocas Verdes Basin. However, the full extent of this relationship remains unclear due to accessibility challenges and the apparent change in the stratigraphic records both north and south of the Beagle Channel. In this study, we integrate anisotropy of magnetic susceptibility (AMS) with structural observations across turbiditic sandstones and mudstones from the Lower Cretaceous Yahgan Formation. We analyzed thirty new sampling sites located along the northern coast of the island and the Dientes de Navarino mountain group. The AMS data exhibited predominantly oblate magnetic fabrics, with P’ values ranging from 1.02 to 2.22. The ellipsoid orientations correlated well with the structural features, particularly cleavage (S1) and fold axes. High P’ values and tectonic fabric types were concentrated in the western part of the island. A transition from a tectonic fabric with lower anisotropy degrees to a more sedimentary fabric was observed towards the east and south. These findings reflect a W-E deformation gradient consistent with the island´s structural features, including an overprinting cleavage family (S2) restricted to the island’s northwest. This study highlights the utility of AMS in elucidating strain directions and reconstructing deformation histories in complex orogenic settings.
Fil: González Vidal, Roberto. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geología; Chile
Fil: Tapia, Felipe. 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. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; Argentina
Fil: Barcia Poblete, Fernando Andrés. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geología; Chile
Fil: Peña, Matías. Universidad de Chile; Chile
Fil: Salazar, Esteban. Servicio Nacional de Geología y Minería; Chile
Fil: Ríos, Valentina. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geología; Chile
description Navarino Island is located in the southernmost part of South America, within the Central Belt of the Fuegian Orogen. The shortening of the geological units observed on the island is believed to be related to a compressional event during the closure of the Rocas Verdes Basin. However, the full extent of this relationship remains unclear due to accessibility challenges and the apparent change in the stratigraphic records both north and south of the Beagle Channel. In this study, we integrate anisotropy of magnetic susceptibility (AMS) with structural observations across turbiditic sandstones and mudstones from the Lower Cretaceous Yahgan Formation. We analyzed thirty new sampling sites located along the northern coast of the island and the Dientes de Navarino mountain group. The AMS data exhibited predominantly oblate magnetic fabrics, with P’ values ranging from 1.02 to 2.22. The ellipsoid orientations correlated well with the structural features, particularly cleavage (S1) and fold axes. High P’ values and tectonic fabric types were concentrated in the western part of the island. A transition from a tectonic fabric with lower anisotropy degrees to a more sedimentary fabric was observed towards the east and south. These findings reflect a W-E deformation gradient consistent with the island´s structural features, including an overprinting cleavage family (S2) restricted to the island’s northwest. This study highlights the utility of AMS in elucidating strain directions and reconstructing deformation histories in complex orogenic settings.
publishDate 2025
dc.date.none.fl_str_mv 2025-12
info:eu-repo/date/embargoEnd/2026-07-17
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/11336/277933
González Vidal, Roberto; Tapia, Felipe; Barcia Poblete, Fernando Andrés; Peña, Matías; Salazar, Esteban; et al.; Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 170; 12-2025; 1-42
0895-9811
CONICET Digital
CONICET
url http://hdl.handle.net/11336/277933
identifier_str_mv González Vidal, Roberto; Tapia, Felipe; Barcia Poblete, Fernando Andrés; Peña, Matías; Salazar, Esteban; et al.; Compressional tectonics related to Fuegian orogeny: Insights from AMS and structural geology in Navarino Island, Chile; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 170; 12-2025; 1-42
0895-9811
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0895981125005619
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2025.105899
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eu_rights_str_mv embargoedAccess
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 Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
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instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
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repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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