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Abstract:

Analogue models combining different sets of preexisting structural weaknesses were developed to under- stand their evolution during regional ~ENE shortening. Strain analysis of simulations was performed with the GEODEF 1.1 software, a tool that allows to quantify deformation in plan view on the basis of displacement fields. Results showed up that regional NNE heterogeneities are reactivated as dextral reverse-slip structures, though NNE neoformed thrusts are also present. Likewise, dominant sinistral strike-slip motions have been obtained for reactivated second-order WNW structures whereas sinistral reverse-slip has been recorded for NW ones. Comparison of these results with structural, kinematic and paleomagnetic data supports partitioned dextral transpression for the northern Andean Precordillera since the Miocene. Moreover, models not only confirm sinistral strike-slip motions for WNW structures of the Precordillera but also suggest that they would represent preexisting crustal fabrics that were reactivated during the Andean orogeny. These cross-strike structures have played a significant role in the construction and evolution of the fold and thrust belt as they segmentate the activity of orogen-parallel structures. © 2015, Servicio Nacional de Geologia y Mineria. All rights reserved.

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Documento: Artículo
Título:Neogene structure of the andean precordillera, Argentina: Insights from analogue models
Autor:Oriolo, S.; Cristallini, E.O.; Japas, M.S.; Yagupsky, D.L.
Filiación:Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Intendente Güiraldes 2160, Buenos Aires, Argentina
Laboratorio de Modelado Geológico, IDEAN (UBA-CONICET), Intendente Güiraldes 2160, Buenos Aires, Argentina
Instituto de Geociencias Básicas, Aplicadas y Ambientales (CONICET-UBA), Intendente Güiraldes 2160, Buenos Aires, Argentina
Palabras clave:Cross-strike structures; Flat-slab subduction; GEODEF software; Inherited crustal fabrics; Strain partitioning; Transpression; Andean orogeny; deformation; displacement; Neogene; reverse fault; slip; software; strain analysis; strain partitioning; strike-slip fault; subduction zone; transpression; Argentina
Año:2015
Volumen:42
Número:1
Página de inicio:20
Página de fin:35
DOI: http://dx.doi.org/10.5027/andgeoV42n1-a02
Título revista:Andean Geology
Título revista abreviado:Andean Geol.
ISSN:07187092
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v42_n1_p20_Oriolo

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Citas:

---------- APA ----------
Oriolo, S., Cristallini, E.O., Japas, M.S. & Yagupsky, D.L. (2015) . Neogene structure of the andean precordillera, Argentina: Insights from analogue models . Andean Geology, 42(1), 20-35.
http://dx.doi.org/10.5027/andgeoV42n1-a02
---------- CHICAGO ----------
Oriolo, S., Cristallini, E.O., Japas, M.S., Yagupsky, D.L. "Neogene structure of the andean precordillera, Argentina: Insights from analogue models " . Andean Geology 42, no. 1 (2015) : 20-35.
http://dx.doi.org/10.5027/andgeoV42n1-a02
---------- MLA ----------
Oriolo, S., Cristallini, E.O., Japas, M.S., Yagupsky, D.L. "Neogene structure of the andean precordillera, Argentina: Insights from analogue models " . Andean Geology, vol. 42, no. 1, 2015, pp. 20-35.
http://dx.doi.org/10.5027/andgeoV42n1-a02
---------- VANCOUVER ----------
Oriolo, S., Cristallini, E.O., Japas, M.S., Yagupsky, D.L. Neogene structure of the andean precordillera, Argentina: Insights from analogue models . Andean Geol. 2015;42(1):20-35.
http://dx.doi.org/10.5027/andgeoV42n1-a02