Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?

The Andes of southern Patagonia experienced a Miocene shift towards faster and higher angle subduction followed by the approach and collision of the Chile oceanic ridge. We present a kinematic study characterizing palaeostress fields computed from brittle tectonics to better constrain upper crustal...

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Autores principales: Barberon, Vanesa, Sue, Christian, Ghiglione, Matías, Ronda, Gonzalo, Aragón, Eugenio
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2018
Materias:
Geología
Brittle deformation
Geodynamics
Patagonia
Plate coupling/decoupling
Southern andes
Tectonics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/100083
https://ri.conicet.gov.ar/11336/84860
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-100083
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Brittle deformation
Geodynamics
Patagonia
Plate coupling/decoupling
Southern andes
Tectonics
spellingShingle Geología
Brittle deformation
Geodynamics
Patagonia
Plate coupling/decoupling
Southern andes
Tectonics
Barberon, Vanesa
Sue, Christian
Ghiglione, Matías
Ronda, Gonzalo
Aragón, Eugenio
Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
topic_facet Geología
Brittle deformation
Geodynamics
Patagonia
Plate coupling/decoupling
Southern andes
Tectonics
description The Andes of southern Patagonia experienced a Miocene shift towards faster and higher angle subduction followed by the approach and collision of the Chile oceanic ridge. We present a kinematic study characterizing palaeostress fields computed from brittle tectonics to better constrain upper crustal deformation during this complex scenario. Although previous studies already suggested variable kinematics, it is striking that in a long-lasting subduction environment, the computed palaeostress tensors are mostly strike-slip (55%), while 35% are extensional, and only 10% compressive which are concentrated along a main frontal thrust. Cross-cutting relationships and synsedimentary deformation indicate that a long-lived strike-slip regime was punctuated by a lower Miocene extensional event in the foreland before the main compressional event. The results are discussed in contrasting geodynamic models of plate coupling/decoupling versus direction and rate of convergence of the subducting plate, to explain the main mechanisms that control back-arc deformation.
format Articulo
Preprint
author Barberon, Vanesa
Sue, Christian
Ghiglione, Matías
Ronda, Gonzalo
Aragón, Eugenio
author_facet Barberon, Vanesa
Sue, Christian
Ghiglione, Matías
Ronda, Gonzalo
Aragón, Eugenio
author_sort Barberon, Vanesa
title Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
title_short Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
title_full Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
title_fullStr Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
title_full_unstemmed Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
title_sort late cenozoic brittle deformation in the southern patagonian andes: record of plate coupling/decoupling during variable subduction?
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/100083
https://ri.conicet.gov.ar/11336/84860
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