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
- Institución
- Universidad Nacional de Río Negro
- OAI Identificador
- oai:rid.unrn.edu.ar:20.500.12049/13497
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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 |
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reponame:RID-UNRN (UNRN) instname:Universidad Nacional de Río Negro |
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Universidad Nacional de Río Negro |
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RID-UNRN (UNRN) - Universidad Nacional de Río Negro |
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