Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata

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The North Patagonian fold-thrust belt (41°–44° S) is characterized by a low topography, reduced crustal thickness and a broad lateral development determined by a broken foreland system in the retroarc zone. This particular structural system has not been fully addressed in terms of the age and mechan...

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Autores principales:	Folguera, Andrés, Gianni, Guido Martin, Orts, Dario Leandro
Publicado:	2016
Materias:	Andean orogenesis Fold-thrust belt North Patagonia Syntectonic strata Sedimentary rocks Structural geology Tectonics Volcanic rocks Balanced cross sections Fold-thrust belts Lateral propagation Patagonia Tectonic evolution Thermomechanical model Plates (structural components) crustal thickness deformation fold and thrust belt orogeny subduction tectonic evolution thermochronology topography Andes
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v677-678_n_p99_Echaurren http://hdl.handle.net/20.500.12110/paper_00401951_v677-678_n_p99_Echaurren
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	paper:paper_00401951_v677-678_n_p99_Echaurren2025-07-30T17:44:35Z Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata Folguera, Andrés Gianni, Guido Martin Orts, Dario Leandro Andean orogenesis Fold-thrust belt North Patagonia Syntectonic strata Sedimentary rocks Structural geology Tectonics Volcanic rocks Andean orogenesis Balanced cross sections Fold-thrust belts Lateral propagation Patagonia Syntectonic strata Tectonic evolution Thermomechanical model Plates (structural components) crustal thickness deformation fold and thrust belt orogeny subduction tectonic evolution thermochronology topography Andes Patagonia The North Patagonian fold-thrust belt (41°–44° S) is characterized by a low topography, reduced crustal thickness and a broad lateral development determined by a broken foreland system in the retroarc zone. This particular structural system has not been fully addressed in terms of the age and mechanisms that built this orogenic segment. Here, new field and seismic evidence of syntectonic strata constrain the timing of the main deformational stages, evaluating the prevailing crustal regime for the different mountain domains through time. Growth strata and progressive unconformities, controlled by extensional or compressive structures, were recognized in volcanic and sedimentary rocks from the cordilleran to the extra-Andean domain. These data were used to construct a balanced cross section, whose deep structure was investigated through a thermomechanical model that characterizes the upper plate rheology. Our results indicate two main compressive stages, interrupted by an extensional relaxation period. The first contractional stage in the mid-Cretaceous inverted Jurassic–Lower Cretaceous half graben systems, reactivating the western Cañadón Asfalto rift border ~ 500 km away from the trench, at a time of arc foreland expansion. For this stage, available thermochronological data reveal forearc cooling episodes, and global tectonic reconstructions indicate mid-ocean ridge collisions against the western edge of an upper plate with rapid trenchward displacement. Widespread synextensional volcanism is recognized throughout the Paleogene during plate reorganization; retroarc Paleocene-–Eocene flare up activity is interpreted as product of a slab rollback, and fore-to-retroarc Oligocene slab/asthenospheric derived products as an expression of enhanced extension. The second stage of mountain growth occurred in Miocene time associated with Nazca Plate subduction, reaching nearly the same amplitude than the first compressive stage. Extensional weakening of the upper plate predating the described contractional stages appears as a necessary condition for abnormal lateral propagation of deformation. © 2016 Elsevier B.V. Fil:Folguera, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 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. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v677-678_n_p99_Echaurren http://hdl.handle.net/20.500.12110/paper_00401951_v677-678_n_p99_Echaurren
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Andean orogenesis Fold-thrust belt North Patagonia Syntectonic strata Sedimentary rocks Structural geology Tectonics Volcanic rocks Andean orogenesis Balanced cross sections Fold-thrust belts Lateral propagation Patagonia Syntectonic strata Tectonic evolution Thermomechanical model Plates (structural components) crustal thickness deformation fold and thrust belt orogeny subduction tectonic evolution thermochronology topography Andes Patagonia
spellingShingle	Andean orogenesis Fold-thrust belt North Patagonia Syntectonic strata Sedimentary rocks Structural geology Tectonics Volcanic rocks Andean orogenesis Balanced cross sections Fold-thrust belts Lateral propagation Patagonia Syntectonic strata Tectonic evolution Thermomechanical model Plates (structural components) crustal thickness deformation fold and thrust belt orogeny subduction tectonic evolution thermochronology topography Andes Patagonia Folguera, Andrés Gianni, Guido Martin Orts, Dario Leandro Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata
topic_facet	Andean orogenesis Fold-thrust belt North Patagonia Syntectonic strata Sedimentary rocks Structural geology Tectonics Volcanic rocks Andean orogenesis Balanced cross sections Fold-thrust belts Lateral propagation Patagonia Syntectonic strata Tectonic evolution Thermomechanical model Plates (structural components) crustal thickness deformation fold and thrust belt orogeny subduction tectonic evolution thermochronology topography Andes Patagonia
description	The North Patagonian fold-thrust belt (41°–44° S) is characterized by a low topography, reduced crustal thickness and a broad lateral development determined by a broken foreland system in the retroarc zone. This particular structural system has not been fully addressed in terms of the age and mechanisms that built this orogenic segment. Here, new field and seismic evidence of syntectonic strata constrain the timing of the main deformational stages, evaluating the prevailing crustal regime for the different mountain domains through time. Growth strata and progressive unconformities, controlled by extensional or compressive structures, were recognized in volcanic and sedimentary rocks from the cordilleran to the extra-Andean domain. These data were used to construct a balanced cross section, whose deep structure was investigated through a thermomechanical model that characterizes the upper plate rheology. Our results indicate two main compressive stages, interrupted by an extensional relaxation period. The first contractional stage in the mid-Cretaceous inverted Jurassic–Lower Cretaceous half graben systems, reactivating the western Cañadón Asfalto rift border ~ 500 km away from the trench, at a time of arc foreland expansion. For this stage, available thermochronological data reveal forearc cooling episodes, and global tectonic reconstructions indicate mid-ocean ridge collisions against the western edge of an upper plate with rapid trenchward displacement. Widespread synextensional volcanism is recognized throughout the Paleogene during plate reorganization; retroarc Paleocene-–Eocene flare up activity is interpreted as product of a slab rollback, and fore-to-retroarc Oligocene slab/asthenospheric derived products as an expression of enhanced extension. The second stage of mountain growth occurred in Miocene time associated with Nazca Plate subduction, reaching nearly the same amplitude than the first compressive stage. Extensional weakening of the upper plate predating the described contractional stages appears as a necessary condition for abnormal lateral propagation of deformation. © 2016 Elsevier B.V.
author	Folguera, Andrés Gianni, Guido Martin Orts, Dario Leandro
author_facet	Folguera, Andrés Gianni, Guido Martin Orts, Dario Leandro
author_sort	Folguera, Andrés
title	Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata
title_short	Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata
title_full	Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata
title_fullStr	Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata
title_full_unstemmed	Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata
title_sort	tectonic evolution of the north patagonian andes (41°–44° s) through recognition of syntectonic strata
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v677-678_n_p99_Echaurren http://hdl.handle.net/20.500.12110/paper_00401951_v677-678_n_p99_Echaurren
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_version_	1840323776160464896

Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata

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