Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: The Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) revisited

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As integral parts of du Toit's (1927) "Samfrau Geosyncline", the Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) share similar paleoclimatic, paleogeographic, and paleotectonic aspects related to the Late Paleozoic tectono-magmatic activity...

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Autores principales: López Gamundí, O.R., Rossello, E.A.
Formato: JOUR
Materias:
Basin evolution
Gondwanaland
Karoo basin
Late Paleozoic
Sauce Grande basin
basin evolution
magmatism
tectonics
Argentina, Buenos Aires Province, Sauce Grande
South Africa, Karoo Basin
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00167835_v86_n4_p819_LopezGamundi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00167835_v86_n4_p819_LopezGamundi2023-10-03T14:14:48Z Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: The Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) revisited López Gamundí, O.R. Rossello, E.A. Basin evolution Gondwanaland Karoo basin Late Paleozoic Sauce Grande basin basin evolution Gondwanaland magmatism tectonics Argentina, Buenos Aires Province, Sauce Grande South Africa, Karoo Basin As integral parts of du Toit's (1927) "Samfrau Geosyncline", the Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) share similar paleoclimatic, paleogeographic, and paleotectonic aspects related to the Late Paleozoic tectono-magmatic activity along the Panthalassan continental margin of Gondwanaland. Late Carboniferou-earliest Permian glacial deposits were deposited in the Sauce Grande (Sauce Grande Formation) and Karoo (Dwyka Formation) basins and Falkland-Malvinas Islands (Lafonia Formation) during an initial (sag) phase of extension. The pre-breakup position of the Falkland (Malvinas) Islands on the easternmost part of the Karoo basin (immediately east of the coast of South Africa) is supported by recent paleomagnetic data, lithofacies associations, paleoice flow directions and age similarities between the Dwyka and the Lafonia glacial sequences. The desintegration of the Gondwanan Ice Sheet (GIS) triggered widespread transgressions, reflected in the stratigraphic record by the presence of inter-basinally correlatable, open marine, fine-grained deposits (Piedra Azul Formation in the Sauce Grande basin, Prince Albert Formation in the Karoo basin and Port Sussex Formation in the Falkland Islands) capping glacial marine sediments. These early postglacial transgressive deposits, characterised by fossils of the Eurydesma fauna and Glossopteris flora, represent the maximum flooding of the basins. Cratonward foreland subsidence was triggered by the San Rafael orogeny (ca. 270 Ma) in Argentina and propogated along the Gondwanan margin. This subsidence phase generated sufficient space to accommodate thick synorogenic sequences derived from the orogenic flanks of the Sauce Grande and Karoo basins. Compositionally, the initial extensional phase of these basins was characterized by quartz-rich, craton-derived detritus and was followed by a compressional (foreland) phase characterized by a paleocurrent reversal and dominance of arc/foldbelt-derived material. In the Sauce Grande basin, tuffs are interbedded in the upper half of the synorogenic, foldbelt-derived Tunas Formation (Early-early Late? Permian). Likewise, the first widespread appearance of tuffs in the Karoo basin is in the Whitehall Formation, of late Early Permian (260 Ma) age. Silicic volcanism along the Andes and Patagonia (Choiyoi magmatic province) peaked between the late Early Permian and Late Permian. A link between these volcanics and the consanguineous airborne tuffs present in the Sauce Grande and Karoo basins is suggested on the basis of their similar compositions and ages. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00167835_v86_n4_p819_LopezGamundi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Basin evolution
Gondwanaland
Karoo basin
Late Paleozoic
Sauce Grande basin
basin evolution
Gondwanaland
magmatism
tectonics
Argentina, Buenos Aires Province, Sauce Grande
South Africa, Karoo Basin
spellingShingle Basin evolution
Gondwanaland
Karoo basin
Late Paleozoic
Sauce Grande basin
basin evolution
Gondwanaland
magmatism
tectonics
Argentina, Buenos Aires Province, Sauce Grande
South Africa, Karoo Basin
López Gamundí, O.R.
Rossello, E.A.
Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: The Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) revisited
topic_facet Basin evolution
Gondwanaland
Karoo basin
Late Paleozoic
Sauce Grande basin
basin evolution
Gondwanaland
magmatism
tectonics
Argentina, Buenos Aires Province, Sauce Grande
South Africa, Karoo Basin
description As integral parts of du Toit's (1927) "Samfrau Geosyncline", the Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) share similar paleoclimatic, paleogeographic, and paleotectonic aspects related to the Late Paleozoic tectono-magmatic activity along the Panthalassan continental margin of Gondwanaland. Late Carboniferou-earliest Permian glacial deposits were deposited in the Sauce Grande (Sauce Grande Formation) and Karoo (Dwyka Formation) basins and Falkland-Malvinas Islands (Lafonia Formation) during an initial (sag) phase of extension. The pre-breakup position of the Falkland (Malvinas) Islands on the easternmost part of the Karoo basin (immediately east of the coast of South Africa) is supported by recent paleomagnetic data, lithofacies associations, paleoice flow directions and age similarities between the Dwyka and the Lafonia glacial sequences. The desintegration of the Gondwanan Ice Sheet (GIS) triggered widespread transgressions, reflected in the stratigraphic record by the presence of inter-basinally correlatable, open marine, fine-grained deposits (Piedra Azul Formation in the Sauce Grande basin, Prince Albert Formation in the Karoo basin and Port Sussex Formation in the Falkland Islands) capping glacial marine sediments. These early postglacial transgressive deposits, characterised by fossils of the Eurydesma fauna and Glossopteris flora, represent the maximum flooding of the basins. Cratonward foreland subsidence was triggered by the San Rafael orogeny (ca. 270 Ma) in Argentina and propogated along the Gondwanan margin. This subsidence phase generated sufficient space to accommodate thick synorogenic sequences derived from the orogenic flanks of the Sauce Grande and Karoo basins. Compositionally, the initial extensional phase of these basins was characterized by quartz-rich, craton-derived detritus and was followed by a compressional (foreland) phase characterized by a paleocurrent reversal and dominance of arc/foldbelt-derived material. In the Sauce Grande basin, tuffs are interbedded in the upper half of the synorogenic, foldbelt-derived Tunas Formation (Early-early Late? Permian). Likewise, the first widespread appearance of tuffs in the Karoo basin is in the Whitehall Formation, of late Early Permian (260 Ma) age. Silicic volcanism along the Andes and Patagonia (Choiyoi magmatic province) peaked between the late Early Permian and Late Permian. A link between these volcanics and the consanguineous airborne tuffs present in the Sauce Grande and Karoo basins is suggested on the basis of their similar compositions and ages.
format JOUR
author López Gamundí, O.R.
Rossello, E.A.
author_facet López Gamundí, O.R.
Rossello, E.A.
author_sort López Gamundí, O.R.
title Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: The Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) revisited
title_short Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: The Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) revisited
title_full Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: The Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) revisited
title_fullStr Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: The Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) revisited
title_full_unstemmed Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: The Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) revisited
title_sort basin fill evolution and paleotectonic patterns along the samfrau geosyncline: the sauce grande basin-ventana foldbelt (argentina) and karoo basin-cape foldbelt (south africa) revisited
url http://hdl.handle.net/20.500.12110/paper_00167835_v86_n4_p819_LopezGamundi
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