Stratigraphy of the Chubut group (Cretaceous, Golfo San Jorge basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture
- Autores
- Paredes, José M.; Foix, Nicolás; Allard, José O.; Lizzoli, Sabrina; Olazábal, Sabrina X.; Tunik, Maisa A.
- Año de publicación
- 2025
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The Chubut Group (Cretaceous, Golfo San Jorge Basin) is a continental succession up to 6,000 meters thick, preserved in an endorheic basin. Its basal depositional system includes the fluvial Matasiete Formation and the lacustrine Pozo D-129 Formation, the main source rock for the hydrocarbons of the basin. The Matasiete Formation (Aptian) represents a high-accommodation, exotic fluvial system with headwaters in the present-day Cañadón Asfalto Basin (CAB), referred to as the Los Adobes Formation. Sediment was transported southward to a saline-alkaline lake (Pozo D-129 Formation) through N-S sedimentary corridors in an extensional setting. The overlying depositional system is integrated by the Castillo and Mina del Carmen formations (Albian-Cenomanian?), and it consists of reworked volcaniclastic particles in drainage catchments within a W-E elongated extensional basin, disconnected from the CAB. The subsequent depositional system includes the Bajo Barreal Formation (Cenomanian- Coniacian?), containing the main hydrocarbon reservoirs. It shows varied stacking density in hundreds of meters thick cycles, linked to climatic cycles. Low netto- gross fluvial stratigraphy featuring small-scale channel belts and paleosols indicates a temperate, subhumid/humid climate with seasonal rainfall. High net-to-gross fluvial stratigraphy records larger-scale channel belts interbedded with paleosols developed in a warmer, humid climate with perennial rainfall. The uppermost depositional system includes the paleosol-rich Laguna Palacios Formation at basin margins, with maximum thicknesses along syncline axes, and the red-colored, anastomosing fluvial systems of the Maastrichtian Colhué Huapi Formation that fill incised valleys. Both units are equivalent to the upper strata of Meseta Espinosa and El Trébol formations in the subsurface, showing degradational features marking the onset of surface uplift in the San Bernardo Fold Belt.
Centro de Investigaciones Geológicas - Materia
-
Geología
Endorheic basin
Cretaceous fluvial systems
Alluvial architecture
Allogenic controls
Patagonia - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/181978
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Stratigraphy of the Chubut group (Cretaceous, Golfo San Jorge basin, Argentina): impacts of allogenic controls on the alluvial macro-architectureParedes, José M.Foix, NicolásAllard, José O.Lizzoli, SabrinaOlazábal, Sabrina X.Tunik, Maisa A.GeologíaEndorheic basinCretaceous fluvial systemsAlluvial architectureAllogenic controlsPatagoniaThe Chubut Group (Cretaceous, Golfo San Jorge Basin) is a continental succession up to 6,000 meters thick, preserved in an endorheic basin. Its basal depositional system includes the fluvial Matasiete Formation and the lacustrine Pozo D-129 Formation, the main source rock for the hydrocarbons of the basin. The Matasiete Formation (Aptian) represents a high-accommodation, exotic fluvial system with headwaters in the present-day Cañadón Asfalto Basin (CAB), referred to as the Los Adobes Formation. Sediment was transported southward to a saline-alkaline lake (Pozo D-129 Formation) through N-S sedimentary corridors in an extensional setting. The overlying depositional system is integrated by the Castillo and Mina del Carmen formations (Albian-Cenomanian?), and it consists of reworked volcaniclastic particles in drainage catchments within a W-E elongated extensional basin, disconnected from the CAB. The subsequent depositional system includes the Bajo Barreal Formation (Cenomanian- Coniacian?), containing the main hydrocarbon reservoirs. It shows varied stacking density in hundreds of meters thick cycles, linked to climatic cycles. Low netto- gross fluvial stratigraphy featuring small-scale channel belts and paleosols indicates a temperate, subhumid/humid climate with seasonal rainfall. High net-to-gross fluvial stratigraphy records larger-scale channel belts interbedded with paleosols developed in a warmer, humid climate with perennial rainfall. The uppermost depositional system includes the paleosol-rich Laguna Palacios Formation at basin margins, with maximum thicknesses along syncline axes, and the red-colored, anastomosing fluvial systems of the Maastrichtian Colhué Huapi Formation that fill incised valleys. Both units are equivalent to the upper strata of Meseta Espinosa and El Trébol formations in the subsurface, showing degradational features marking the onset of surface uplift in the San Bernardo Fold Belt.Centro de Investigaciones Geológicas2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf32-43http://sedici.unlp.edu.ar/handle/10915/181978enginfo:eu-repo/semantics/altIdentifier/issn/1851-4979info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc/4.0/Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:49:38Zoai:sedici.unlp.edu.ar:10915/181978Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:49:39.215SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Stratigraphy of the Chubut group (Cretaceous, Golfo San Jorge basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture |
title |
Stratigraphy of the Chubut group (Cretaceous, Golfo San Jorge basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture |
spellingShingle |
Stratigraphy of the Chubut group (Cretaceous, Golfo San Jorge basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture Paredes, José M. Geología Endorheic basin Cretaceous fluvial systems Alluvial architecture Allogenic controls Patagonia |
title_short |
Stratigraphy of the Chubut group (Cretaceous, Golfo San Jorge basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture |
title_full |
Stratigraphy of the Chubut group (Cretaceous, Golfo San Jorge basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture |
title_fullStr |
Stratigraphy of the Chubut group (Cretaceous, Golfo San Jorge basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture |
title_full_unstemmed |
Stratigraphy of the Chubut group (Cretaceous, Golfo San Jorge basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture |
title_sort |
Stratigraphy of the Chubut group (Cretaceous, Golfo San Jorge basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture |
dc.creator.none.fl_str_mv |
Paredes, José M. Foix, Nicolás Allard, José O. Lizzoli, Sabrina Olazábal, Sabrina X. Tunik, Maisa A. |
author |
Paredes, José M. |
author_facet |
Paredes, José M. Foix, Nicolás Allard, José O. Lizzoli, Sabrina Olazábal, Sabrina X. Tunik, Maisa A. |
author_role |
author |
author2 |
Foix, Nicolás Allard, José O. Lizzoli, Sabrina Olazábal, Sabrina X. Tunik, Maisa A. |
author2_role |
author author author author author |
dc.subject.none.fl_str_mv |
Geología Endorheic basin Cretaceous fluvial systems Alluvial architecture Allogenic controls Patagonia |
topic |
Geología Endorheic basin Cretaceous fluvial systems Alluvial architecture Allogenic controls Patagonia |
dc.description.none.fl_txt_mv |
The Chubut Group (Cretaceous, Golfo San Jorge Basin) is a continental succession up to 6,000 meters thick, preserved in an endorheic basin. Its basal depositional system includes the fluvial Matasiete Formation and the lacustrine Pozo D-129 Formation, the main source rock for the hydrocarbons of the basin. The Matasiete Formation (Aptian) represents a high-accommodation, exotic fluvial system with headwaters in the present-day Cañadón Asfalto Basin (CAB), referred to as the Los Adobes Formation. Sediment was transported southward to a saline-alkaline lake (Pozo D-129 Formation) through N-S sedimentary corridors in an extensional setting. The overlying depositional system is integrated by the Castillo and Mina del Carmen formations (Albian-Cenomanian?), and it consists of reworked volcaniclastic particles in drainage catchments within a W-E elongated extensional basin, disconnected from the CAB. The subsequent depositional system includes the Bajo Barreal Formation (Cenomanian- Coniacian?), containing the main hydrocarbon reservoirs. It shows varied stacking density in hundreds of meters thick cycles, linked to climatic cycles. Low netto- gross fluvial stratigraphy featuring small-scale channel belts and paleosols indicates a temperate, subhumid/humid climate with seasonal rainfall. High net-to-gross fluvial stratigraphy records larger-scale channel belts interbedded with paleosols developed in a warmer, humid climate with perennial rainfall. The uppermost depositional system includes the paleosol-rich Laguna Palacios Formation at basin margins, with maximum thicknesses along syncline axes, and the red-colored, anastomosing fluvial systems of the Maastrichtian Colhué Huapi Formation that fill incised valleys. Both units are equivalent to the upper strata of Meseta Espinosa and El Trébol formations in the subsurface, showing degradational features marking the onset of surface uplift in the San Bernardo Fold Belt. Centro de Investigaciones Geológicas |
description |
The Chubut Group (Cretaceous, Golfo San Jorge Basin) is a continental succession up to 6,000 meters thick, preserved in an endorheic basin. Its basal depositional system includes the fluvial Matasiete Formation and the lacustrine Pozo D-129 Formation, the main source rock for the hydrocarbons of the basin. The Matasiete Formation (Aptian) represents a high-accommodation, exotic fluvial system with headwaters in the present-day Cañadón Asfalto Basin (CAB), referred to as the Los Adobes Formation. Sediment was transported southward to a saline-alkaline lake (Pozo D-129 Formation) through N-S sedimentary corridors in an extensional setting. The overlying depositional system is integrated by the Castillo and Mina del Carmen formations (Albian-Cenomanian?), and it consists of reworked volcaniclastic particles in drainage catchments within a W-E elongated extensional basin, disconnected from the CAB. The subsequent depositional system includes the Bajo Barreal Formation (Cenomanian- Coniacian?), containing the main hydrocarbon reservoirs. It shows varied stacking density in hundreds of meters thick cycles, linked to climatic cycles. Low netto- gross fluvial stratigraphy featuring small-scale channel belts and paleosols indicates a temperate, subhumid/humid climate with seasonal rainfall. High net-to-gross fluvial stratigraphy records larger-scale channel belts interbedded with paleosols developed in a warmer, humid climate with perennial rainfall. The uppermost depositional system includes the paleosol-rich Laguna Palacios Formation at basin margins, with maximum thicknesses along syncline axes, and the red-colored, anastomosing fluvial systems of the Maastrichtian Colhué Huapi Formation that fill incised valleys. Both units are equivalent to the upper strata of Meseta Espinosa and El Trébol formations in the subsurface, showing degradational features marking the onset of surface uplift in the San Bernardo Fold Belt. |
publishDate |
2025 |
dc.date.none.fl_str_mv |
2025 |
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eng |
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eng |
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openAccess |
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http://creativecommons.org/licenses/by-nc/4.0/ Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) |
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