Structural evolution of the Andes in a transitional zone between flat and normal subduction (33°30′-33°45′S), Argentina and Chile

The sector of the Andes studied in this paper (33°30′-33°45′S) presents a key region to study the relationship between tectonic setting and deformation history in a transitional zone between flat (north of 33°S) and normal (south of 33°45′S) subduction segments. The Andes at these latitudes are prim...

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Autores principales: Giambiagi, L.B., Ramos, V.A.
Formato: JOUR
Materias:
Andes
Fold-and-thrust belt
Mesozoic anisotropy
Neogene deformation
Subduction
crustal deformation
fold and thrust belt
structural geology
subduction zone
tectonic setting
Argentina
Chile
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v15_n1_p101_Giambiagi
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_08959811_v15_n1_p101_Giambiagi2023-10-03T15:42:32Z Structural evolution of the Andes in a transitional zone between flat and normal subduction (33°30′-33°45′S), Argentina and Chile Giambiagi, L.B. Ramos, V.A. Andes Fold-and-thrust belt Mesozoic anisotropy Neogene deformation Subduction crustal deformation fold and thrust belt structural geology subduction zone tectonic setting Argentina Chile The sector of the Andes studied in this paper (33°30′-33°45′S) presents a key region to study the relationship between tectonic setting and deformation history in a transitional zone between flat (north of 33°S) and normal (south of 33°45′S) subduction segments. The Andes at these latitudes are primarily composed of the Neogene Aconcagua fold-and-thrust belt and the basement-block uplift of the Cordillera Frontal. Detailed mapping has revealed that the structure within the inner part of the fold-and-thrust belt resulted from both thin-and thick-skinned tectonic interactions. In the outer part, displacement is transferred to Mesozoic décollement levels, accounting for a thin-skinned architecture. Geographically, the switch from thick- to -thin skinned tectonics occurs near the border between Chile and Argentina. Although the geometry of the subducted Nazca Plate may have influenced the timing and style of deformation in the foreland, plate geometry alone does not adequately explain the style of deformation within the fold-and-thrust belt. Here it is shown that the change in deformation style in the fold-and-thrust belt correlates with the location of pre-existing Mesozoic structure, and specifically that Neogene-age thick-skinned thrusting was controlled by the presence of Mesozoic margin-boundary normal faults. Deformation in this region of the Andean fold-and-thrust belt was thus controlled by a combination of tectonic setting and pre-existing extensional structure. © 2002 Elsevier Science Ltd. 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_08959811_v15_n1_p101_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
Fold-and-thrust belt
Mesozoic anisotropy
Neogene deformation
Subduction
crustal deformation
fold and thrust belt
structural geology
subduction zone
tectonic setting
Argentina
Chile
spellingShingle Andes
Fold-and-thrust belt
Mesozoic anisotropy
Neogene deformation
Subduction
crustal deformation
fold and thrust belt
structural geology
subduction zone
tectonic setting
Argentina
Chile
Giambiagi, L.B.
Ramos, V.A.
Structural evolution of the Andes in a transitional zone between flat and normal subduction (33°30′-33°45′S), Argentina and Chile
topic_facet Andes
Fold-and-thrust belt
Mesozoic anisotropy
Neogene deformation
Subduction
crustal deformation
fold and thrust belt
structural geology
subduction zone
tectonic setting
Argentina
Chile
description The sector of the Andes studied in this paper (33°30′-33°45′S) presents a key region to study the relationship between tectonic setting and deformation history in a transitional zone between flat (north of 33°S) and normal (south of 33°45′S) subduction segments. The Andes at these latitudes are primarily composed of the Neogene Aconcagua fold-and-thrust belt and the basement-block uplift of the Cordillera Frontal. Detailed mapping has revealed that the structure within the inner part of the fold-and-thrust belt resulted from both thin-and thick-skinned tectonic interactions. In the outer part, displacement is transferred to Mesozoic décollement levels, accounting for a thin-skinned architecture. Geographically, the switch from thick- to -thin skinned tectonics occurs near the border between Chile and Argentina. Although the geometry of the subducted Nazca Plate may have influenced the timing and style of deformation in the foreland, plate geometry alone does not adequately explain the style of deformation within the fold-and-thrust belt. Here it is shown that the change in deformation style in the fold-and-thrust belt correlates with the location of pre-existing Mesozoic structure, and specifically that Neogene-age thick-skinned thrusting was controlled by the presence of Mesozoic margin-boundary normal faults. Deformation in this region of the Andean fold-and-thrust belt was thus controlled by a combination of tectonic setting and pre-existing extensional structure. © 2002 Elsevier Science Ltd. All rights reserved.
format JOUR
author Giambiagi, L.B.
Ramos, V.A.
author_facet Giambiagi, L.B.
Ramos, V.A.
author_sort Giambiagi, L.B.
title Structural evolution of the Andes in a transitional zone between flat and normal subduction (33°30′-33°45′S), Argentina and Chile
title_short Structural evolution of the Andes in a transitional zone between flat and normal subduction (33°30′-33°45′S), Argentina and Chile
title_full Structural evolution of the Andes in a transitional zone between flat and normal subduction (33°30′-33°45′S), Argentina and Chile
title_fullStr Structural evolution of the Andes in a transitional zone between flat and normal subduction (33°30′-33°45′S), Argentina and Chile
title_full_unstemmed Structural evolution of the Andes in a transitional zone between flat and normal subduction (33°30′-33°45′S), Argentina and Chile
title_sort structural evolution of the andes in a transitional zone between flat and normal subduction (33°30′-33°45′s), argentina and chile
url http://hdl.handle.net/20.500.12110/paper_08959811_v15_n1_p101_Giambiagi
work_keys_str_mv AT giambiagilb structuralevolutionoftheandesinatransitionalzonebetweenflatandnormalsubduction33303345sargentinaandchile
AT ramosva structuralevolutionoftheandesinatransitionalzonebetweenflatandnormalsubduction33303345sargentinaandchile
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