Andean oblique folds in the Cordillera Oriental – Northwestern Argentina: Insights from analogue models

Payrola, Patricio; Hongn, Fernando; Cristallini, Ernesto Osvaldo; García, Víctor H.; Papa, Cecilia del

doi:10.1016/j.jsg.2012.05.003

Cited by 11 publications

(10 citation statements)

References 34 publications

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“…The west-vergent structures are, in places, older than the east-vergent structures (e.g. in the northern Calchaqu ı Valley) while elsewhere they are slightly younger, such as in the Luracatao Valley (see Payrola Bosio et al, 2012). The relationships between east-vergent fore-thrusts and west-vergent back-thrusts testify to a rather complex spatial distribution of Paleogene deformation during the deposition of Los Colorados sequences.…”

Section: Tectono-sedimentary Basin Evolution In the Context Of The Evmentioning

confidence: 97%

“…The western faults partially reused Lower Paleozoic fabrics . Detailed stratigraphic and structural analyses have revealed that the Luracatao Fault was first activated during the initial deposition of the Los Colorados sequences (Payrola Bosio et al, 2012). 9b; see also Payrola Bosio et al, 2009.…”

Section: Structures In the Luracatao Areamentioning

confidence: 99%

“…1 for locations). in the northern Calchaqu ı Valley) while elsewhere they are slightly younger, such as in the Luracatao Valley (see Payrola Bosio et al, 2012). The west-vergent structures are, in places, older than the east-vergent structures (e.g.…”

Section: Tectono-sedimentary Basin Evolution In the Context Of The Evmentioning

confidence: 99%

“…9b; see also Payrola Bosio et al, 2009. Detailed stratigraphic and structural analyses have revealed that the Luracatao Fault was first activated during the initial deposition of the Los Colorados sequences (Payrola Bosio et al, 2012). Neogene reactivation is indicated by thermochronologic studies (Deeken et al, 2006), and fault scarps in Quaternary conglomerates furnish evidence of protracted displacements, particularly in the southern half of the valley.…”

Section: Structures In the Luracatao Areamentioning

confidence: 99%

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Middle Eocene‐Oligocene broken‐foreland evolution in the Andean Calchaqui Valley, NW Argentina: insights from stratigraphic, structural and provenance studies

et al. 2013

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Two end-member models have been proposed for the Paleogene Andean foreland: a simple W-E migrating foreland model and a broken-foreland model. We present new stratigraphic, sedimentological and structural data from the Paleogene Quebrada de los Colorados (QLC) Formation, in the Eastern Cordillera, with which to test these two different models. Basin-wide unconformities, growthstrata and changes in provenance indicate deposition of the QLC Formation in a tectonically active basin. Both west-and east-vergent structures, rooted in the basement, controlled the deposition and distribution of the QLC Formation from the Middle Eocene to the Early Miocene. The provenance analysis indicates that the main source areas were basement blocks, like the Paleozoic Oire Eruptive Complex, uplifted during Paleogene shortening, and that delimits the eastern boundary of the present-day intraorogenic Puna plateau. A comparison of the QLC sedimentary basin-fill pattern with those of adjacent Paleogene basins in the Puna plateau and in the Santa B arbara System highlights the presence of discrete depozones. These reflect the early compartmentalization of the foreland, rather than a stepwise advance of the deformation front of a thrust belt. The early Tertiary foreland of the southern central Andes is represented by a ca. 250-km-wide area comprising several deformation zones (Arizaro, Mac on, Copalayo and Calchaqu ı) in which doubly vergent or asymmetric structures, rooted in the basement, were generated. Hence, classical foreland model is difficult to apply in this Paleogene basin; and our data and interpretation agree with a broken-foreland model.

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Section: Tectono-sedimentary Basin Evolution In the Context Of The Evmentioning

confidence: 97%

Section: Structures In the Luracatao Areamentioning

confidence: 99%

Section: Tectono-sedimentary Basin Evolution In the Context Of The Evmentioning

confidence: 99%

Section: Structures In the Luracatao Areamentioning

confidence: 99%

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Middle Eocene‐Oligocene broken‐foreland evolution in the Andean Calchaqui Valley, NW Argentina: insights from stratigraphic, structural and provenance studies

et al. 2013

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“…Esto limita la generación y reactivación de estructuras a una geometría predeterminada otorgada por el material indeformable. Payrola (2012) utilizó una mezcla de arena y gelatina (arena gelatinizada) para simular basamento cristalino en la representación de pliegues oblicuos. Bureau et al (2014) da cuenta de que la concentración de gelatina controla la cohesión del material.…”

Section: Modelación Analógicaunclassified

Influencia de cuerpos discordantes de distinta cohesión en la geometría estructural de fajas plegadas y corridas: aproximación sobre la base de un modelamiento analógico

Villarroel

Jara

Charrier

2021

andgeo

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Lithological heterogeneities in a rock series deformed by the development of a fold-and-thrust belt (FTB) affects the pattern of the resulting structures. We present a series of analogue experiments to determine the effect caused on the deformation pattern of a FTB by the presence of cohesive bodies, like plutons or basement blocks that oppose greater resistance than the host rocks to contractional deformation. The influence of these bodies on the deformation pattern of the FTB was studied by incorporating discordant bodies with different cohesions within a stratified granular sequence with negligible cohesion. We describe two sets of experiments in which the inserted body presents low (Co1) and high (Co2) cohesion respectively. The experiments show a tendency of the structural pattern to curve around the inserted body and to migrate towards the deformation front or the foreland, even when the cohesive body is not exposed. In the first case (Co1) the thrusts cut across the cohesive body, while in the second one (Co2) the cohesive body is not faulted, but transferred towards the deformation front along a basal detachment. Comparison of these results with natural examples at different scales shows a high degree of coincidence in the structural patterns recognized in both cases. Two of the main characteristics of these patterns are the tendency of the thrust faults traces to avoid the cohesive body and adopt the geometry of its distal edge. In order to explain curvatures in natural structural patterns in fold-and-thrust belts, we suggest consider the presence of unexposed bodies with higher strength than their environment.

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Analogue modeling as a tool to assist seismic structural interpretation in the Andean fold-and-thrust belt

Ferrer¹,

Santolaria²,

Muñoz³

et al. 2022

Andean Structural Styles

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Andean oblique folds in the Cordillera Oriental – Northwestern Argentina: Insights from analogue models

Cited by 11 publications

References 34 publications

Middle Eocene‐Oligocene broken‐foreland evolution in the Andean Calchaqui Valley, NW Argentina: insights from stratigraphic, structural and provenance studies

Middle Eocene‐Oligocene broken‐foreland evolution in the Andean Calchaqui Valley, NW Argentina: insights from stratigraphic, structural and provenance studies

Influencia de cuerpos discordantes de distinta cohesión en la geometría estructural de fajas plegadas y corridas: aproximación sobre la base de un modelamiento analógico

Analogue modeling as a tool to assist seismic structural interpretation in the Andean fold-and-thrust belt

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