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

Autores
Olazábal, Sabrina; Tunik, Maisa; Paredes, José; Allard, José; Foix, Nicolás
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Fil: Olazábal, Sabrina. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.
Fil: Tunik, Maisa. CONICET. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación en Paleobiología y Geología (IIPG), Universidad Nacional de Río Negro-CONICET. Argentina.
Fil: Paredes, José. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.
Fil: Allard, José. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.
Fil: Foix, Nicolás. Departamento de Geología (UNPSJB), Ciudad Universitaria. CONICET. Consejo Nacional de Investigaciones Científicas y Técnicas. Argentina.
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.
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.
Materia
Ciencias Exactas y Naturales
Detrital modes
Volcaniclastic input
Sediment routing
Provenance
Multiple source areas
Ciencias Exactas y Naturales
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
RID-UNRN (UNRN)
Institución
Universidad Nacional de Río Negro
OAI Identificador
oai:rid.unrn.edu.ar:20.500.12049/13497

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oai_identifier_str oai:rid.unrn.edu.ar:20.500.12049/13497
network_acronym_str RIDUNRN
repository_id_str 4369
network_name_str RID-UNRN (UNRN)
spelling The Chubut Group (Cretaceous, Golfo San Jorge Basin): a synthesis of its sedimentary petrographyOlazábal, SabrinaTunik, MaisaParedes, JoséAllard, JoséFoix, NicolásCiencias Exactas y NaturalesDetrital modesVolcaniclastic inputSediment routingProvenanceMultiple source areasCiencias Exactas y NaturalesFil: Olazábal, Sabrina. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.Fil: Tunik, Maisa. CONICET. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación en Paleobiología y Geología (IIPG), Universidad Nacional de Río Negro-CONICET. Argentina.Fil: Paredes, José. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.Fil: Allard, José. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.Fil: Foix, Nicolás. Departamento de Geología (UNPSJB), Ciudad Universitaria. CONICET. Consejo Nacional de Investigaciones Científicas y Técnicas. Argentina.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.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.Asociación Argentina de Sedimentología2025-06-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfOlazabal, S., Tunik, M.A., Paredes, J.M., Allard, J., y Foix. N. 2025- The Chubut Group (Cretaceous, Golfo San Jorge Basin): A Synthesis of Its Sedimentary Petrography. Latin American Journal of Sedimentology and Basin Analysis. 32 (1): 44-56-https://lajsba.sedimentologia.org.ar/lajsba/article/view/277/371http://rid.unrn.edu.ar/handle/20.500.12049/13497eng32Latin American Journal of Sedimentology and Basin Analysisinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/4.0/reponame:RID-UNRN (UNRN)instname:Universidad Nacional de Río Negro2025-09-29T14:29:19Zoai:rid.unrn.edu.ar:20.500.12049/13497instacron:UNRNInstitucionalhttps://rid.unrn.edu.ar/jspui/Universidad públicaNo correspondehttps://rid.unrn.edu.ar/oai/snrdrid@unrn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:43692025-09-29 14:29:20.196RID-UNRN (UNRN) - Universidad Nacional de Río Negrofalse
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
Ciencias Exactas y Naturales
Detrital modes
Volcaniclastic input
Sediment routing
Provenance
Multiple source areas
Ciencias Exactas y Naturales
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
Tunik, Maisa
Paredes, José
Allard, José
Foix, Nicolás
author Olazábal, Sabrina
author_facet Olazábal, Sabrina
Tunik, Maisa
Paredes, José
Allard, José
Foix, Nicolás
author_role author
author2 Tunik, Maisa
Paredes, José
Allard, José
Foix, Nicolás
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias Exactas y Naturales
Detrital modes
Volcaniclastic input
Sediment routing
Provenance
Multiple source areas
Ciencias Exactas y Naturales
topic Ciencias Exactas y Naturales
Detrital modes
Volcaniclastic input
Sediment routing
Provenance
Multiple source areas
Ciencias Exactas y Naturales
dc.description.none.fl_txt_mv Fil: Olazábal, Sabrina. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.
Fil: Tunik, Maisa. CONICET. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación en Paleobiología y Geología (IIPG), Universidad Nacional de Río Negro-CONICET. Argentina.
Fil: Paredes, José. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.
Fil: Allard, José. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.
Fil: Foix, Nicolás. Departamento de Geología (UNPSJB), Ciudad Universitaria. CONICET. Consejo Nacional de Investigaciones Científicas y Técnicas. Argentina.
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.
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.
description Fil: Olazábal, Sabrina. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.
publishDate 2025
dc.date.none.fl_str_mv 2025-06-17
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 Olazabal, S., Tunik, M.A., Paredes, J.M., Allard, J., y Foix. N. 2025- The Chubut Group (Cretaceous, Golfo San Jorge Basin): A Synthesis of Its Sedimentary Petrography. Latin American Journal of Sedimentology and Basin Analysis. 32 (1): 44-56-
https://lajsba.sedimentologia.org.ar/lajsba/article/view/277/371
http://rid.unrn.edu.ar/handle/20.500.12049/13497
identifier_str_mv Olazabal, S., Tunik, M.A., Paredes, J.M., Allard, J., y Foix. N. 2025- The Chubut Group (Cretaceous, Golfo San Jorge Basin): A Synthesis of Its Sedimentary Petrography. Latin American Journal of Sedimentology and Basin Analysis. 32 (1): 44-56-
url https://lajsba.sedimentologia.org.ar/lajsba/article/view/277/371
http://rid.unrn.edu.ar/handle/20.500.12049/13497
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 32
Latin American Journal of Sedimentology and Basin Analysis
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
dc.format.none.fl_str_mv 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:RID-UNRN (UNRN)
instname:Universidad Nacional de Río Negro
reponame_str RID-UNRN (UNRN)
collection RID-UNRN (UNRN)
instname_str Universidad Nacional de Río Negro
repository.name.fl_str_mv RID-UNRN (UNRN) - Universidad Nacional de Río Negro
repository.mail.fl_str_mv rid@unrn.edu.ar
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