The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes

The Aconcagua fold and thrust belt, located in the Andean mountains at 32°30′ to 34°S, has been described as a classic model of a thin-skinned thrust belt. However, new structural data from its southern sector have shown that it has a complex structural framework reflected in multiple Mesozoic exten...

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Autores principales:	Giambiagi, L.B., Alvarez, P.P., Godoy, E., Ramos, V.A.
Formato:	JOUR
Materias:	Andes Jurassic rift system Neogene compression Pre-existing structures Structural evolution extensional tectonics faulting fold and thrust belt Mesozoic stress field tectonic evolution thin skinned tectonics Argentina Chile
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00401951_v369_n1-2_p1_Giambiagi
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00401951_v369_n1-2_p1_Giambiagi
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spelling	todo:paper_00401951_v369_n1-2_p1_Giambiagi2023-10-03T14:50:09Z The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes Giambiagi, L.B. Alvarez, P.P. Godoy, E. Ramos, V.A. Andes Jurassic rift system Neogene compression Pre-existing structures Structural evolution extensional tectonics faulting fold and thrust belt Mesozoic stress field tectonic evolution thin skinned tectonics Andes Argentina Chile The Aconcagua fold and thrust belt, located in the Andean mountains at 32°30′ to 34°S, has been described as a classic model of a thin-skinned thrust belt. However, new structural data from its southern sector have shown that it has a complex structural framework reflected in multiple Mesozoic extensional phases, overprinted by structural inversion, as well as thin- and thick-skinned tectonics. Two major superimposed extensional structural styles have been identified for the Mesozoic characterized by distinctly oriented stress fields. A key role in the evolution of this part of the fold and thrust belt was played by a Late Triassic to Early Jurassic depocentre and by Late Jurassic block faulting. Shortening was accommodated by a combination of inversion of pre-existing normal faults, development of footwall short cuts and both thin and thick-skinned thrusting. Synrift and postrift sedimentary rocks were uplifted by reactivation of normal faults, with further shortening along newly formed thin-skinned thrust faults. The geometry of thin-skinned fault systems is controlled by the architecture of the rift basin, competent footwalls forming barriers to the lateral propagation of detachments. © 2003 Elsevier B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00401951_v369_n1-2_p1_Giambiagi
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Andes Jurassic rift system Neogene compression Pre-existing structures Structural evolution extensional tectonics faulting fold and thrust belt Mesozoic stress field tectonic evolution thin skinned tectonics Andes Argentina Chile
spellingShingle	Andes Jurassic rift system Neogene compression Pre-existing structures Structural evolution extensional tectonics faulting fold and thrust belt Mesozoic stress field tectonic evolution thin skinned tectonics Andes Argentina Chile Giambiagi, L.B. Alvarez, P.P. Godoy, E. Ramos, V.A. The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes
topic_facet	Andes Jurassic rift system Neogene compression Pre-existing structures Structural evolution extensional tectonics faulting fold and thrust belt Mesozoic stress field tectonic evolution thin skinned tectonics Andes Argentina Chile
description	The Aconcagua fold and thrust belt, located in the Andean mountains at 32°30′ to 34°S, has been described as a classic model of a thin-skinned thrust belt. However, new structural data from its southern sector have shown that it has a complex structural framework reflected in multiple Mesozoic extensional phases, overprinted by structural inversion, as well as thin- and thick-skinned tectonics. Two major superimposed extensional structural styles have been identified for the Mesozoic characterized by distinctly oriented stress fields. A key role in the evolution of this part of the fold and thrust belt was played by a Late Triassic to Early Jurassic depocentre and by Late Jurassic block faulting. Shortening was accommodated by a combination of inversion of pre-existing normal faults, development of footwall short cuts and both thin and thick-skinned thrusting. Synrift and postrift sedimentary rocks were uplifted by reactivation of normal faults, with further shortening along newly formed thin-skinned thrust faults. The geometry of thin-skinned fault systems is controlled by the architecture of the rift basin, competent footwalls forming barriers to the lateral propagation of detachments. © 2003 Elsevier B.V. All rights reserved.
format	JOUR
author	Giambiagi, L.B. Alvarez, P.P. Godoy, E. Ramos, V.A.
author_facet	Giambiagi, L.B. Alvarez, P.P. Godoy, E. Ramos, V.A.
author_sort	Giambiagi, L.B.
title	The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes
title_short	The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes
title_full	The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes
title_fullStr	The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes
title_full_unstemmed	The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes
title_sort	control of pre-existing extensional structures on the evolution of the southern sector of the aconcagua fold and thrust belt, southern andes
url	http://hdl.handle.net/20.500.12110/paper_00401951_v369_n1-2_p1_Giambiagi
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The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes

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