Stratigraphy of the Chubut Group (Cretaceous, Golfo San Jorge Basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture
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 th...
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Asociación Argentina de Sedimentología
2025-04-01
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| Series: | Latin American Journal of Sedimentology and Basin Analysis |
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| Online Access: | https://gananventas.com/lajsba/article/view/268 |
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| author | José Matildo Paredes Nicolás Foix José O. Allard Sabrina Lizzoli Sabrina X. Olazábal Maisa A. Tunik |
| author_facet | José Matildo Paredes Nicolás Foix José O. Allard Sabrina Lizzoli Sabrina X. Olazábal Maisa A. Tunik |
| author_sort | José Matildo Paredes |
| collection | DOAJ |
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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), 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–Turonian?), containing the main hydrocarbon reservoirs. It shows varied stacking density in hundreds of meters thick cycles, linked to climatic cycles. Low net-to-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.
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| format | Article |
| id | doaj-art-ee95eb3b4c3b45ec83d14ea9c9153161 |
| institution | OA Journals |
| issn | 1669-7316 1851-4979 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Asociación Argentina de Sedimentología |
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| series | Latin American Journal of Sedimentology and Basin Analysis |
| spelling | doaj-art-ee95eb3b4c3b45ec83d14ea9c91531612025-08-20T02:19:15ZengAsociación Argentina de SedimentologíaLatin American Journal of Sedimentology and Basin Analysis1669-73161851-49792025-04-01Stratigraphy of the Chubut Group (Cretaceous, Golfo San Jorge Basin, Argentina): impacts of allogenic controls on the alluvial macro-architectureJosé Matildo Paredes0Nicolás Foix1José O. Allard2Sabrina Lizzoli3Sabrina X. Olazábal4Maisa A. Tunik5Departamento de Geología, Universidad Nacional de la Patagonia San Juan Bosco, Comodoro Rivadavia, Chubut, ArgentinaDepartamento de Geología, Universidad Nacional de la Patagonia San Juan Bosco, Comodoro Rivadavia, Chubut, ArgentinaDepartamento de Geología, Universidad Nacional de la Patagonia San Juan Bosco, Comodoro Rivadavia, Chubut, ArgentinaCentro de Investigaciones Geológicas, CONICET-UNLPDepartamento de Geología, Universidad Nacional de la Patagonia San Juan Bosco, Comodoro Rivadavia, Chubut, ArgentinaInstituto de Investigación en Paleobiología y Geología (IIPG), Universidad Nacional de Río Negro (UNR)-CONICET, General Roca, Río Negro, Argentina 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), 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–Turonian?), containing the main hydrocarbon reservoirs. It shows varied stacking density in hundreds of meters thick cycles, linked to climatic cycles. Low net-to-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. https://gananventas.com/lajsba/article/view/268endorheic basinCretaceous fluvial systemsalluvial architectureallogenic controlsPatagonia |
| spellingShingle | José Matildo Paredes Nicolás Foix José O. Allard Sabrina Lizzoli Sabrina X. Olazábal Maisa A. Tunik Stratigraphy of the Chubut Group (Cretaceous, Golfo San Jorge Basin, Argentina): impacts of allogenic controls on the alluvial macro-architecture Latin American Journal of Sedimentology and Basin Analysis endorheic basin Cretaceous fluvial systems alluvial architecture allogenic controls Patagonia |
| title | 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_short | 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 |
| topic | endorheic basin Cretaceous fluvial systems alluvial architecture allogenic controls Patagonia |
| url | https://gananventas.com/lajsba/article/view/268 |
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