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
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/181978

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spelling 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
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