Patagonian broken foreland and related synorogenic rifting: The origin of the Chubut Group Basin

The Central Patagonia is characterized by prominent continental deposits that belong to the Cretaceous Chubut Group Basin, whose tectonic setting remains controversial. It has been interpreted as a foreland basin, an extensional basin and even as a sag stage of a rift event. Related deposits outcrop...

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Autores principales:	Gianni, Guido Martin, Orts, Dario Leandro, Tobal, Jonathan Elías, Folguera, Andrés
Publicado:	2015
Materias:	Broken foreland Chubut group Growth strata Patagonian andes Deposits Seismology Chubut Group Evolutionary stage Fold-and-thrust belts Integrated analysis Lithospheric anisotropy Patagonian Andes Tectonics continental collision Cretaceous extensional tectonics foreland basin inversion tectonics plate convergence rifting subduction Andes Atlantic Ocean Patagonia San Jorge Gulf
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v649_n_p81_Gianni http://hdl.handle.net/20.500.12110/paper_00401951_v649_n_p81_Gianni
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00401951_v649_n_p81_Gianni
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spelling	paper:paper_00401951_v649_n_p81_Gianni2025-07-30T17:44:34Z Patagonian broken foreland and related synorogenic rifting: The origin of the Chubut Group Basin Gianni, Guido Martin Orts, Dario Leandro Tobal, Jonathan Elías Folguera, Andrés Broken foreland Chubut group Growth strata Patagonian andes Deposits Seismology Broken foreland Chubut Group Evolutionary stage Fold-and-thrust belts Growth strata Integrated analysis Lithospheric anisotropy Patagonian Andes Tectonics continental collision Cretaceous extensional tectonics foreland basin inversion tectonics plate convergence rifting subduction Andes Atlantic Ocean Patagonia San Jorge Gulf The Central Patagonia is characterized by prominent continental deposits that belong to the Cretaceous Chubut Group Basin, whose tectonic setting remains controversial. It has been interpreted as a foreland basin, an extensional basin and even as a sag stage of a rift event. Related deposits outcrop as part of the Patagonian broken foreland, east of the Patagonian Andes. Particulary, the San Bernardo fold and thrust belt, between 42° and 48°S, as the main sector of the broken foreland, constitutes a NNW-trending intraplate belt located 450. km away from the trench. Coincidentally, at these latitudes, 1200. km east of the trench, intraplate deformation has caused tectonic inversion of Mesozoic basins presently located at the Atlantic offshore area. Additionally, at the San Jorge Gulf area this orogenic system interferes with a conspicuous E-W extensional system, transversally disposed to the Andean strike, mainly active between the late Early Cretaceous and late Paleocene. We carried out an integrated analysis from structural, 2-D and 3-D seismic data at the San Bernardo FTB and the adjacent Río Mayo Basin, studying sections of the Chubut Group Basin to unravel the different evolutionary stages. Thus, surface and subsurface evidence of syn-compressional deposition indicate the development of a broken foreland basin related to the formation of the San Bernardo FTB, suggesting an initial growth during the late Early Cretaceous and probably up to the late Paleocene. Our results imply that the Cretaceous compression acted in concert with transversal foreland extension. Hence, we propose a syncontractional rift reactivation of a potential lithospheric anisotropy, triggered by regional contraction. Finally, the origin of compression during this time is discussed in relation to multiple processes that go from high convergence between plates and trenchward motion of South America, collision of mid-ocean ridges, to potential dip changes in the subducted slab, as suggested by arc expansion. © 2015 Elsevier B.V. Fil:Gianni, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Orts, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tobal, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Folguera, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v649_n_p81_Gianni http://hdl.handle.net/20.500.12110/paper_00401951_v649_n_p81_Gianni
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Broken foreland Chubut group Growth strata Patagonian andes Deposits Seismology Broken foreland Chubut Group Evolutionary stage Fold-and-thrust belts Growth strata Integrated analysis Lithospheric anisotropy Patagonian Andes Tectonics continental collision Cretaceous extensional tectonics foreland basin inversion tectonics plate convergence rifting subduction Andes Atlantic Ocean Patagonia San Jorge Gulf
spellingShingle	Broken foreland Chubut group Growth strata Patagonian andes Deposits Seismology Broken foreland Chubut Group Evolutionary stage Fold-and-thrust belts Growth strata Integrated analysis Lithospheric anisotropy Patagonian Andes Tectonics continental collision Cretaceous extensional tectonics foreland basin inversion tectonics plate convergence rifting subduction Andes Atlantic Ocean Patagonia San Jorge Gulf Gianni, Guido Martin Orts, Dario Leandro Tobal, Jonathan Elías Folguera, Andrés Patagonian broken foreland and related synorogenic rifting: The origin of the Chubut Group Basin
topic_facet	Broken foreland Chubut group Growth strata Patagonian andes Deposits Seismology Broken foreland Chubut Group Evolutionary stage Fold-and-thrust belts Growth strata Integrated analysis Lithospheric anisotropy Patagonian Andes Tectonics continental collision Cretaceous extensional tectonics foreland basin inversion tectonics plate convergence rifting subduction Andes Atlantic Ocean Patagonia San Jorge Gulf
description	The Central Patagonia is characterized by prominent continental deposits that belong to the Cretaceous Chubut Group Basin, whose tectonic setting remains controversial. It has been interpreted as a foreland basin, an extensional basin and even as a sag stage of a rift event. Related deposits outcrop as part of the Patagonian broken foreland, east of the Patagonian Andes. Particulary, the San Bernardo fold and thrust belt, between 42° and 48°S, as the main sector of the broken foreland, constitutes a NNW-trending intraplate belt located 450. km away from the trench. Coincidentally, at these latitudes, 1200. km east of the trench, intraplate deformation has caused tectonic inversion of Mesozoic basins presently located at the Atlantic offshore area. Additionally, at the San Jorge Gulf area this orogenic system interferes with a conspicuous E-W extensional system, transversally disposed to the Andean strike, mainly active between the late Early Cretaceous and late Paleocene. We carried out an integrated analysis from structural, 2-D and 3-D seismic data at the San Bernardo FTB and the adjacent Río Mayo Basin, studying sections of the Chubut Group Basin to unravel the different evolutionary stages. Thus, surface and subsurface evidence of syn-compressional deposition indicate the development of a broken foreland basin related to the formation of the San Bernardo FTB, suggesting an initial growth during the late Early Cretaceous and probably up to the late Paleocene. Our results imply that the Cretaceous compression acted in concert with transversal foreland extension. Hence, we propose a syncontractional rift reactivation of a potential lithospheric anisotropy, triggered by regional contraction. Finally, the origin of compression during this time is discussed in relation to multiple processes that go from high convergence between plates and trenchward motion of South America, collision of mid-ocean ridges, to potential dip changes in the subducted slab, as suggested by arc expansion. © 2015 Elsevier B.V.
author	Gianni, Guido Martin Orts, Dario Leandro Tobal, Jonathan Elías Folguera, Andrés
author_facet	Gianni, Guido Martin Orts, Dario Leandro Tobal, Jonathan Elías Folguera, Andrés
author_sort	Gianni, Guido Martin
title	Patagonian broken foreland and related synorogenic rifting: The origin of the Chubut Group Basin
title_short	Patagonian broken foreland and related synorogenic rifting: The origin of the Chubut Group Basin
title_full	Patagonian broken foreland and related synorogenic rifting: The origin of the Chubut Group Basin
title_fullStr	Patagonian broken foreland and related synorogenic rifting: The origin of the Chubut Group Basin
title_full_unstemmed	Patagonian broken foreland and related synorogenic rifting: The origin of the Chubut Group Basin
title_sort	patagonian broken foreland and related synorogenic rifting: the origin of the chubut group basin
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v649_n_p81_Gianni http://hdl.handle.net/20.500.12110/paper_00401951_v649_n_p81_Gianni
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Patagonian broken foreland and related synorogenic rifting: The origin of the Chubut Group Basin

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