The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography

Autores
Olazábal, Sabrina Ximena; Tunik, Maisa Andrea; Paredes, José Matildo; Allard, Jose Oscar; Foix, Nicolas
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This study presents a synthesis of petrographic analyses of the cretaceous Pozo D-129, Matasiete, Castillo, and Bajo Barreal formations in the Golfo San Jorge Basin, highlighting the influence of volcanic activity and sediment supply on the evolution of the Chubut Group. Data from outcrops in the San Bernardo Fold Belt and from the subsurface indicate that sandstone compositional variability was controlled by shifts in sediment source areas, linked to regional tectonic processes and active volcanism. Sandstones exhibit feldspatho-lithic and litho-feldspathic qFL, fQL, IQF to qLF composition detrital modes, with spatial and temporal variations in volcanic, pyroclastic lithic, feldspar and quartz components. The sediment sources for the outcrops in the San Bernardo Fold Belt include the Paleozoic igneous-metamorphic basement, Middle-Upper Jurassic volcanic and volcaniclastic rocks (Lonco Trapial Group), and acidic and pyroclastic sequences assigned to the Marifil Group. In contrast, the South Flank records a broader range of petrofacies, reflecting a combination of distal and local sources. In addition to the provenance of the Andes Cordillera, this sector received sediment contributions from Jurassic rocks exposed in the Deseado Region and older crystalline basement units. Andean volcanism dominates across all units, contributing direct volcanic ash fallout and reworked pyroclastic material.
Fil: Olazábal, Sabrina Ximena. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Tunik, Maisa Andrea. Universidad Nacional de Río Negro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Paredes, José Matildo. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina
Fil: Allard, Jose Oscar. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina
Fil: Foix, Nicolas. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Universidad Nacional de la Patagonia San Juan Bosco. Instituto Multidisciplinario para la Investigación y el Desarrollo Productivo y Social de la Cuenca Golfo San Jorge;
Materia
DETRITAL MODES
VOLCANICLASTIC INPUT
SEDIMENT ROUTING
PROVENANCE
MULTIPLE SOURCE AREAS
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:11336/291534
Acceder
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network_name_str CONICET Digital (CONICET)
spelling The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrographyOlazábal, Sabrina XimenaTunik, Maisa AndreaParedes, José MatildoAllard, Jose OscarFoix, NicolasDETRITAL MODESVOLCANICLASTIC INPUTSEDIMENT ROUTINGPROVENANCEMULTIPLE SOURCE AREAShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1This study presents a synthesis of petrographic analyses of the cretaceous Pozo D-129, Matasiete, Castillo, and Bajo Barreal formations in the Golfo San Jorge Basin, highlighting the influence of volcanic activity and sediment supply on the evolution of the Chubut Group. Data from outcrops in the San Bernardo Fold Belt and from the subsurface indicate that sandstone compositional variability was controlled by shifts in sediment source areas, linked to regional tectonic processes and active volcanism. Sandstones exhibit feldspatho-lithic and litho-feldspathic qFL, fQL, IQF to qLF composition detrital modes, with spatial and temporal variations in volcanic, pyroclastic lithic, feldspar and quartz components. The sediment sources for the outcrops in the San Bernardo Fold Belt include the Paleozoic igneous-metamorphic basement, Middle-Upper Jurassic volcanic and volcaniclastic rocks (Lonco Trapial Group), and acidic and pyroclastic sequences assigned to the Marifil Group. In contrast, the South Flank records a broader range of petrofacies, reflecting a combination of distal and local sources. In addition to the provenance of the Andes Cordillera, this sector received sediment contributions from Jurassic rocks exposed in the Deseado Region and older crystalline basement units. Andean volcanism dominates across all units, contributing direct volcanic ash fallout and reworked pyroclastic material.Fil: Olazábal, Sabrina Ximena. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Tunik, Maisa Andrea. Universidad Nacional de Río Negro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Paredes, José Matildo. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; ArgentinaFil: Allard, Jose Oscar. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; ArgentinaFil: Foix, Nicolas. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Universidad Nacional de la Patagonia San Juan Bosco. Instituto Multidisciplinario para la Investigación y el Desarrollo Productivo y Social de la Cuenca Golfo San Jorge;Asociación Argentina de Sedimentología2025-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/291534Olazábal, Sabrina Ximena; Tunik, Maisa Andrea; Paredes, José Matildo; Allard, Jose Oscar; Foix, Nicolas; The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography; Asociación Argentina de Sedimentología; Latin American Journal of Sedimentology and Basin Analysis; 32; 1; 7-2025; 44-561851-4979CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://lajsba.sedimentologia.org.ar/lajsba/article/view/277info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-08-25T15:05:05Zoai:ri.conicet.gov.ar:11336/291534instacron: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:34982026-08-25 15:05:06.212CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography
title The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography
spellingShingle The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography
Olazábal, Sabrina Ximena
DETRITAL MODES
VOLCANICLASTIC INPUT
SEDIMENT ROUTING
PROVENANCE
MULTIPLE SOURCE AREAS
title_short The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography
title_full The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography
title_fullStr The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography
title_full_unstemmed The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography
title_sort The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography
dc.creator.none.fl_str_mv Olazábal, Sabrina Ximena
Tunik, Maisa Andrea
Paredes, José Matildo
Allard, Jose Oscar
Foix, Nicolas
author Olazábal, Sabrina Ximena
author_facet Olazábal, Sabrina Ximena
Tunik, Maisa Andrea
Paredes, José Matildo
Allard, Jose Oscar
Foix, Nicolas
author_role author
author2 Tunik, Maisa Andrea
Paredes, José Matildo
Allard, Jose Oscar
Foix, Nicolas
author2_role author
author
author
author
dc.subject.none.fl_str_mv DETRITAL MODES
VOLCANICLASTIC INPUT
SEDIMENT ROUTING
PROVENANCE
MULTIPLE SOURCE AREAS
topic DETRITAL MODES
VOLCANICLASTIC INPUT
SEDIMENT ROUTING
PROVENANCE
MULTIPLE SOURCE AREAS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv This study presents a synthesis of petrographic analyses of the cretaceous Pozo D-129, Matasiete, Castillo, and Bajo Barreal formations in the Golfo San Jorge Basin, highlighting the influence of volcanic activity and sediment supply on the evolution of the Chubut Group. Data from outcrops in the San Bernardo Fold Belt and from the subsurface indicate that sandstone compositional variability was controlled by shifts in sediment source areas, linked to regional tectonic processes and active volcanism. Sandstones exhibit feldspatho-lithic and litho-feldspathic qFL, fQL, IQF to qLF composition detrital modes, with spatial and temporal variations in volcanic, pyroclastic lithic, feldspar and quartz components. The sediment sources for the outcrops in the San Bernardo Fold Belt include the Paleozoic igneous-metamorphic basement, Middle-Upper Jurassic volcanic and volcaniclastic rocks (Lonco Trapial Group), and acidic and pyroclastic sequences assigned to the Marifil Group. In contrast, the South Flank records a broader range of petrofacies, reflecting a combination of distal and local sources. In addition to the provenance of the Andes Cordillera, this sector received sediment contributions from Jurassic rocks exposed in the Deseado Region and older crystalline basement units. Andean volcanism dominates across all units, contributing direct volcanic ash fallout and reworked pyroclastic material.
Fil: Olazábal, Sabrina Ximena. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Tunik, Maisa Andrea. Universidad Nacional de Río Negro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Paredes, José Matildo. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina
Fil: Allard, Jose Oscar. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina
Fil: Foix, Nicolas. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Universidad Nacional de la Patagonia San Juan Bosco. Instituto Multidisciplinario para la Investigación y el Desarrollo Productivo y Social de la Cuenca Golfo San Jorge;
description This study presents a synthesis of petrographic analyses of the cretaceous Pozo D-129, Matasiete, Castillo, and Bajo Barreal formations in the Golfo San Jorge Basin, highlighting the influence of volcanic activity and sediment supply on the evolution of the Chubut Group. Data from outcrops in the San Bernardo Fold Belt and from the subsurface indicate that sandstone compositional variability was controlled by shifts in sediment source areas, linked to regional tectonic processes and active volcanism. Sandstones exhibit feldspatho-lithic and litho-feldspathic qFL, fQL, IQF to qLF composition detrital modes, with spatial and temporal variations in volcanic, pyroclastic lithic, feldspar and quartz components. The sediment sources for the outcrops in the San Bernardo Fold Belt include the Paleozoic igneous-metamorphic basement, Middle-Upper Jurassic volcanic and volcaniclastic rocks (Lonco Trapial Group), and acidic and pyroclastic sequences assigned to the Marifil Group. In contrast, the South Flank records a broader range of petrofacies, reflecting a combination of distal and local sources. In addition to the provenance of the Andes Cordillera, this sector received sediment contributions from Jurassic rocks exposed in the Deseado Region and older crystalline basement units. Andean volcanism dominates across all units, contributing direct volcanic ash fallout and reworked pyroclastic material.
publishDate 2025
dc.date.none.fl_str_mv 2025-07
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/11336/291534
Olazábal, Sabrina Ximena; Tunik, Maisa Andrea; Paredes, José Matildo; Allard, Jose Oscar; Foix, Nicolas; The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography; Asociación Argentina de Sedimentología; Latin American Journal of Sedimentology and Basin Analysis; 32; 1; 7-2025; 44-56
1851-4979
CONICET Digital
CONICET
url http://hdl.handle.net/11336/291534
identifier_str_mv Olazábal, Sabrina Ximena; Tunik, Maisa Andrea; Paredes, José Matildo; Allard, Jose Oscar; Foix, Nicolas; The Chubut Group (Cretaceous, Golfo San Jorge Basin): A synthesis of its sedimentary petrography; Asociación Argentina de Sedimentología; Latin American Journal of Sedimentology and Basin Analysis; 32; 1; 7-2025; 44-56
1851-4979
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://lajsba.sedimentologia.org.ar/lajsba/article/view/277
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
application/pdf
dc.publisher.none.fl_str_mv Asociación Argentina de Sedimentología
publisher.none.fl_str_mv Asociación Argentina de Sedimentología
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
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score 13.265058

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