Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina

The Andes are the classic example of a subduction-related orogen. Segmentation of the orogenic belt is related to dynamics of the subduction zone and to upper plate thermomechanical properties. Understanding the controlling factors on deformation along the orogen requires studying cross sections at...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Mescua, J.F., Giambiagi, L.B., Tassara, A., Gimenez, M., Ramos, V.A.
Formato:	JOUR
Materias:	Faulting Geochronology Plates (structural components) Balanced cross sections Controlling factors Fold-and-thrust belts Foreland deformation Partial cross section Structural modeling Structural models Thermomechanical properties Structural geology Andean orogeny Cenozoic crustal shortening crustal structure crustal thickness deformation mechanism fold and thrust belt foreland basin slab subduction zone tectonic evolution tectonic setting thermomechanics Argentina Malargue Mendoza
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_1553040X_v10_n3_p585_Mescua
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_1553040X_v10_n3_p585_Mescua
record_format	dspace
spelling	todo:paper_1553040X_v10_n3_p585_Mescua2023-10-03T16:25:22Z Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina Mescua, J.F. Giambiagi, L.B. Tassara, A. Gimenez, M. Ramos, V.A. Faulting Geochronology Plates (structural components) Balanced cross sections Controlling factors Fold-and-thrust belts Foreland deformation Partial cross section Structural modeling Structural models Thermomechanical properties Structural geology Andean orogeny Cenozoic crustal shortening crustal structure crustal thickness deformation mechanism fold and thrust belt foreland basin slab subduction zone tectonic evolution tectonic setting thermomechanics Argentina Malargue Mendoza The Andes are the classic example of a subduction-related orogen. Segmentation of the orogenic belt is related to dynamics of the subduction zone and to upper plate thermomechanical properties. Understanding the controlling factors on deformation along the orogen requires studying cross sections at different latitudes and determining the respective roles of plate interactions, upper plate weakness zones, and crustal architecture. A newly constructed balanced cross section of the Argentinean Andes at 35°S, in the transition between a fl at-slab and a normal subduction segment, shows tectonic inversion of Mesozoic normal faults and development of new thrusts during Andean shortening. Estimated shortening of 26.2 km, equivalent to 22% of the initial length, is lower than previous estimates obtained from partial cross sections using non-inversion structural models. Comparison of this estimate with crustal area balance constrained by geophysical data indicates that (1) crustal thickness was varied across the transect before Andean shortening, with a thick (~45 km) crustal block to the west related to late Paleozoic orogeny, and a thinner block (~32 km) in the east related to Mesozoic stretching; and (2) a structural model incorporating tectonic inversion is consistent with regional shortening and crustal thickness trends. Our results underscore the role of the inherited characteristics of the upper plate in subduction-related orogens, including preexisting faults and preorogenic crustal thickness variations. © 2014 Geological Society of America. Fil:Mescua, J.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Giambiagi, L.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ramos, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1553040X_v10_n3_p585_Mescua
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Faulting Geochronology Plates (structural components) Balanced cross sections Controlling factors Fold-and-thrust belts Foreland deformation Partial cross section Structural modeling Structural models Thermomechanical properties Structural geology Andean orogeny Cenozoic crustal shortening crustal structure crustal thickness deformation mechanism fold and thrust belt foreland basin slab subduction zone tectonic evolution tectonic setting thermomechanics Argentina Malargue Mendoza
spellingShingle	Faulting Geochronology Plates (structural components) Balanced cross sections Controlling factors Fold-and-thrust belts Foreland deformation Partial cross section Structural modeling Structural models Thermomechanical properties Structural geology Andean orogeny Cenozoic crustal shortening crustal structure crustal thickness deformation mechanism fold and thrust belt foreland basin slab subduction zone tectonic evolution tectonic setting thermomechanics Argentina Malargue Mendoza Mescua, J.F. Giambiagi, L.B. Tassara, A. Gimenez, M. Ramos, V.A. Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina
topic_facet	Faulting Geochronology Plates (structural components) Balanced cross sections Controlling factors Fold-and-thrust belts Foreland deformation Partial cross section Structural modeling Structural models Thermomechanical properties Structural geology Andean orogeny Cenozoic crustal shortening crustal structure crustal thickness deformation mechanism fold and thrust belt foreland basin slab subduction zone tectonic evolution tectonic setting thermomechanics Argentina Malargue Mendoza
description	The Andes are the classic example of a subduction-related orogen. Segmentation of the orogenic belt is related to dynamics of the subduction zone and to upper plate thermomechanical properties. Understanding the controlling factors on deformation along the orogen requires studying cross sections at different latitudes and determining the respective roles of plate interactions, upper plate weakness zones, and crustal architecture. A newly constructed balanced cross section of the Argentinean Andes at 35°S, in the transition between a fl at-slab and a normal subduction segment, shows tectonic inversion of Mesozoic normal faults and development of new thrusts during Andean shortening. Estimated shortening of 26.2 km, equivalent to 22% of the initial length, is lower than previous estimates obtained from partial cross sections using non-inversion structural models. Comparison of this estimate with crustal area balance constrained by geophysical data indicates that (1) crustal thickness was varied across the transect before Andean shortening, with a thick (~45 km) crustal block to the west related to late Paleozoic orogeny, and a thinner block (~32 km) in the east related to Mesozoic stretching; and (2) a structural model incorporating tectonic inversion is consistent with regional shortening and crustal thickness trends. Our results underscore the role of the inherited characteristics of the upper plate in subduction-related orogens, including preexisting faults and preorogenic crustal thickness variations. © 2014 Geological Society of America.
format	JOUR
author	Mescua, J.F. Giambiagi, L.B. Tassara, A. Gimenez, M. Ramos, V.A.
author_facet	Mescua, J.F. Giambiagi, L.B. Tassara, A. Gimenez, M. Ramos, V.A.
author_sort	Mescua, J.F.
title	Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina
title_short	Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina
title_full	Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina
title_fullStr	Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina
title_full_unstemmed	Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina
title_sort	influence of pre-andean history over cenozoic foreland deformation: structural styles in the malargüe fold-and-thrust belt at 35°s, andes of argentina
url	http://hdl.handle.net/20.500.12110/paper_1553040X_v10_n3_p585_Mescua
work_keys_str_mv	AT mescuajf influenceofpreandeanhistoryovercenozoicforelanddeformationstructuralstylesinthemalarguefoldandthrustbeltat35sandesofargentina AT giambiagilb influenceofpreandeanhistoryovercenozoicforelanddeformationstructuralstylesinthemalarguefoldandthrustbeltat35sandesofargentina AT tassaraa influenceofpreandeanhistoryovercenozoicforelanddeformationstructuralstylesinthemalarguefoldandthrustbeltat35sandesofargentina AT gimenezm influenceofpreandeanhistoryovercenozoicforelanddeformationstructuralstylesinthemalarguefoldandthrustbeltat35sandesofargentina AT ramosva influenceofpreandeanhistoryovercenozoicforelanddeformationstructuralstylesinthemalarguefoldandthrustbeltat35sandesofargentina
_version_	1782024992219725824

Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina

Ejemplares similares