Tectonic evolution of the Andes of Neuquén: Constraints derived from the magmatic arc and foreland deformation

The Andes of the Neuquén region (36°-38°S latitude) of the Central Andes have distinctive characteristics that result from the alternation of periods of generalized extension followed by periods of compression. As a result of these processes the Loncopué trough is a unique long depression at the foo...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Ramos, Victor Alberto, Folguera, Andrés
Publicado:	2005
Materias:	forearc basin tectonic evolution Argentina Neuquen Basin South America Zanclea
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v252_n_p15_Ramos http://hdl.handle.net/20.500.12110/paper_03058719_v252_n_p15_Ramos
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_03058719_v252_n_p15_Ramos
record_format	dspace
spelling	paper:paper_03058719_v252_n_p15_Ramos2023-06-08T15:30:55Z Tectonic evolution of the Andes of Neuquén: Constraints derived from the magmatic arc and foreland deformation Ramos, Victor Alberto Folguera, Andrés forearc basin tectonic evolution Argentina Neuquen Basin South America Zanclea The Andes of the Neuquén region (36°-38°S latitude) of the Central Andes have distinctive characteristics that result from the alternation of periods of generalized extension followed by periods of compression. As a result of these processes the Loncopué trough is a unique long depression at the foothills parallel to the Principal Cordillera that consists of a complex half-graben system produced during Oligocene times and extensionally reactivated in the Pliocene-Pleistocene. Its northern sector represents the present contractional orogenic front. The nature and volume of arc-related igneous rocks, the location of the volcanic fronts, expansions and retreats of the magmatism, and the associated igneous activity in the foreland, together with the analyses of the superimposed structural styles, permit the constraint of the alternating tectonic regimes. On these bases, different stages from Jurassic to Present are correlated with changes in the geometry of the Benioff zone through time. Periods of subduction-zone steepening are associated with large volumes of poorly evolved magmas and generalized extension, while shallowing of the subduction zone is linked to foreland migration of more evolved magmas associated with contraction and uplift in the Principal Cordillera. The injection of hot asthenospheric materi al from the subcontinental mantle into the asthenospheric wedge during steepening of the subduction zone produced melting and poorly evolved magmas in an extensional setting. These periods are linked to oceanic plate reorganizations in the late Oligocene and in the early Pliocene. © The Geological Society of London 2005. Fil:Ramos, V.A. 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. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v252_n_p15_Ramos http://hdl.handle.net/20.500.12110/paper_03058719_v252_n_p15_Ramos
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	forearc basin tectonic evolution Argentina Neuquen Basin South America Zanclea
spellingShingle	forearc basin tectonic evolution Argentina Neuquen Basin South America Zanclea Ramos, Victor Alberto Folguera, Andrés Tectonic evolution of the Andes of Neuquén: Constraints derived from the magmatic arc and foreland deformation
topic_facet	forearc basin tectonic evolution Argentina Neuquen Basin South America Zanclea
description	The Andes of the Neuquén region (36°-38°S latitude) of the Central Andes have distinctive characteristics that result from the alternation of periods of generalized extension followed by periods of compression. As a result of these processes the Loncopué trough is a unique long depression at the foothills parallel to the Principal Cordillera that consists of a complex half-graben system produced during Oligocene times and extensionally reactivated in the Pliocene-Pleistocene. Its northern sector represents the present contractional orogenic front. The nature and volume of arc-related igneous rocks, the location of the volcanic fronts, expansions and retreats of the magmatism, and the associated igneous activity in the foreland, together with the analyses of the superimposed structural styles, permit the constraint of the alternating tectonic regimes. On these bases, different stages from Jurassic to Present are correlated with changes in the geometry of the Benioff zone through time. Periods of subduction-zone steepening are associated with large volumes of poorly evolved magmas and generalized extension, while shallowing of the subduction zone is linked to foreland migration of more evolved magmas associated with contraction and uplift in the Principal Cordillera. The injection of hot asthenospheric materi al from the subcontinental mantle into the asthenospheric wedge during steepening of the subduction zone produced melting and poorly evolved magmas in an extensional setting. These periods are linked to oceanic plate reorganizations in the late Oligocene and in the early Pliocene. © The Geological Society of London 2005.
author	Ramos, Victor Alberto Folguera, Andrés
author_facet	Ramos, Victor Alberto Folguera, Andrés
author_sort	Ramos, Victor Alberto
title	Tectonic evolution of the Andes of Neuquén: Constraints derived from the magmatic arc and foreland deformation
title_short	Tectonic evolution of the Andes of Neuquén: Constraints derived from the magmatic arc and foreland deformation
title_full	Tectonic evolution of the Andes of Neuquén: Constraints derived from the magmatic arc and foreland deformation
title_fullStr	Tectonic evolution of the Andes of Neuquén: Constraints derived from the magmatic arc and foreland deformation
title_full_unstemmed	Tectonic evolution of the Andes of Neuquén: Constraints derived from the magmatic arc and foreland deformation
title_sort	tectonic evolution of the andes of neuquén: constraints derived from the magmatic arc and foreland deformation
publishDate	2005
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v252_n_p15_Ramos http://hdl.handle.net/20.500.12110/paper_03058719_v252_n_p15_Ramos
work_keys_str_mv	AT ramosvictoralberto tectonicevolutionoftheandesofneuquenconstraintsderivedfromthemagmaticarcandforelanddeformation AT folgueraandres tectonicevolutionoftheandesofneuquenconstraintsderivedfromthemagmaticarcandforelanddeformation
_version_	1768542220538871808

Tectonic evolution of the Andes of Neuquén: Constraints derived from the magmatic arc and foreland deformation

Ejemplares similares