The Chubut Group (Cretaceous, Golfo San Jorge Basin): a synthesis of its sedimentary petrography
Fil: Olazábal, Sabrina. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina.
Guardado en:
| Autores principales: | , , , , |
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| Lenguaje: | Inglés |
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Asociación Argentina de Sedimentología
2025
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| Acceso en línea: | https://lajsba.sedimentologia.org.ar/lajsba/article/view/277/371 http://rid.unrn.edu.ar/handle/20.500.12049/13497 |
| Aporte de: |
| id |
I65-R171-20.500.12049-13497 |
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| record_format |
dspace |
| institution |
Universidad Nacional de Río Negro |
| institution_str |
I-65 |
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R-171 |
| collection |
Repositorio Institucional Digital de la Universidad Nacional de Río Negro (UNRN) |
| language |
Inglés |
| orig_language_str_mv |
en |
| topic |
Ciencias Exactas y Naturales Detrital modes Volcaniclastic input Sediment routing Provenance Multiple source areas Ciencias Exactas y Naturales |
| spellingShingle |
Ciencias Exactas y Naturales Detrital modes Volcaniclastic input Sediment routing Provenance Multiple source areas Ciencias Exactas y Naturales Olazábal, Sabrina Tunik, Maisa Paredes, José Allard, José Foix, Nicolás The Chubut Group (Cretaceous, Golfo San Jorge Basin): a synthesis of its sedimentary petrography |
| topic_facet |
Ciencias Exactas y Naturales Detrital modes Volcaniclastic input Sediment routing Provenance Multiple source areas Ciencias Exactas y Naturales |
| description |
Fil: Olazábal, Sabrina. Departamento de Geología (UNPSJB), Ciudad Universitaria. Argentina. |
| author |
Olazábal, Sabrina Tunik, Maisa Paredes, José Allard, José Foix, Nicolás |
| author_facet |
Olazábal, Sabrina Tunik, Maisa Paredes, José Allard, José Foix, Nicolás |
| author_sort |
Olazábal, Sabrina |
| title |
The Chubut Group (Cretaceous, Golfo San Jorge Basin): a synthesis of its sedimentary petrography |
| 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 |
chubut group (cretaceous, golfo san jorge basin): a synthesis of its sedimentary petrography |
| publisher |
Asociación Argentina de Sedimentología |
| publishDate |
2025 |
| url |
https://lajsba.sedimentologia.org.ar/lajsba/article/view/277/371 http://rid.unrn.edu.ar/handle/20.500.12049/13497 |
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I65-R171-20.500.12049-134972025-09-24T13:27:46Z application/pdf info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/4.0/ 2025-06-17 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. The Chubut Group (Cretaceous, Golfo San Jorge Basin): a synthesis of its sedimentary petrography Olazábal, Sabrina Tunik, Maisa Paredes, José Allard, José Foix, Nicolás Ciencias Exactas y Naturales Detrital modes Volcaniclastic input Sediment routing Provenance Multiple source areas Ciencias Exactas y Naturales 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. true 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. 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 en 32 Latin American Journal of Sedimentology and Basin Analysis Asociación Argentina de Sedimentología |