Andean oblique folds in the Cordillera Oriental - Northwestern Argentina: Insights from analogue models
The dominant Cenozoic structural grain in northwestern Argentina trends north-south. However, several oblique folds have been mapped, mainly in the Cordillera Oriental and the Sistema de Santa Bárbara. Two oblique NE-SW-trending anticlines are well exposed in the Luracatao Valley-Salta, along the we...
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todo:paper_01918141_v42_n_p194_Payrola2023-10-03T15:09:03Z Andean oblique folds in the Cordillera Oriental - Northwestern Argentina: Insights from analogue models Payrola, P.A. Hongn, F. Cristallini, E. García, V. del Papa, C. Analogue models Andean oblique folds Cordillera oriental Luracatao Valley Andean oblique folds Argentina Cenozoic Cordillera oriental Luracatao Valley Neoproterozoic Palaeogene Reverse faults Rift structure Second orders Buildings Landforms analog model anticline Cenozoic fold heterogeneity reverse fault valley Andes Argentina Cordillera Oriental [Andes] Cordillera Oriental [Argentina] The dominant Cenozoic structural grain in northwestern Argentina trends north-south. However, several oblique folds have been mapped, mainly in the Cordillera Oriental and the Sistema de Santa Bárbara. Two oblique NE-SW-trending anticlines are well exposed in the Luracatao Valley-Salta, along the western border of the Cordillera Oriental. These oblique anticlines are defined by the Palaeogene Santa Bárbara Subgroup and are cut by the reverse faults bounding the Luracatao Valley. We constructed analogue models to simulate the generation of oblique NE-SW anticlines inside the narrow, trough-like Luracatao Valley. Orthogonal compression and basement oblique heterogeneities, oblique compression and basement oblique heterogeneities, and oblique compression configurations were tested in the models. The first two configurations simulate the anticline formation well. In addition, we analyse dextral rotation and the influence of Neoproterozoic basement/Cretaceous rift structures as the cause of the oblique orientation. The analogue models suggest pre-Andean oblique structures controlling the oblique orientation of these Andean folds despite being a second-order planes of weakness. © 2012 Elsevier Ltd. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01918141_v42_n_p194_Payrola |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Analogue models Andean oblique folds Cordillera oriental Luracatao Valley Andean oblique folds Argentina Cenozoic Cordillera oriental Luracatao Valley Neoproterozoic Palaeogene Reverse faults Rift structure Second orders Buildings Landforms analog model anticline Cenozoic fold heterogeneity reverse fault valley Andes Argentina Cordillera Oriental [Andes] Cordillera Oriental [Argentina] |
| spellingShingle |
Analogue models Andean oblique folds Cordillera oriental Luracatao Valley Andean oblique folds Argentina Cenozoic Cordillera oriental Luracatao Valley Neoproterozoic Palaeogene Reverse faults Rift structure Second orders Buildings Landforms analog model anticline Cenozoic fold heterogeneity reverse fault valley Andes Argentina Cordillera Oriental [Andes] Cordillera Oriental [Argentina] Payrola, P.A. Hongn, F. Cristallini, E. García, V. del Papa, C. Andean oblique folds in the Cordillera Oriental - Northwestern Argentina: Insights from analogue models |
| topic_facet |
Analogue models Andean oblique folds Cordillera oriental Luracatao Valley Andean oblique folds Argentina Cenozoic Cordillera oriental Luracatao Valley Neoproterozoic Palaeogene Reverse faults Rift structure Second orders Buildings Landforms analog model anticline Cenozoic fold heterogeneity reverse fault valley Andes Argentina Cordillera Oriental [Andes] Cordillera Oriental [Argentina] |
| description |
The dominant Cenozoic structural grain in northwestern Argentina trends north-south. However, several oblique folds have been mapped, mainly in the Cordillera Oriental and the Sistema de Santa Bárbara. Two oblique NE-SW-trending anticlines are well exposed in the Luracatao Valley-Salta, along the western border of the Cordillera Oriental. These oblique anticlines are defined by the Palaeogene Santa Bárbara Subgroup and are cut by the reverse faults bounding the Luracatao Valley. We constructed analogue models to simulate the generation of oblique NE-SW anticlines inside the narrow, trough-like Luracatao Valley. Orthogonal compression and basement oblique heterogeneities, oblique compression and basement oblique heterogeneities, and oblique compression configurations were tested in the models. The first two configurations simulate the anticline formation well. In addition, we analyse dextral rotation and the influence of Neoproterozoic basement/Cretaceous rift structures as the cause of the oblique orientation. The analogue models suggest pre-Andean oblique structures controlling the oblique orientation of these Andean folds despite being a second-order planes of weakness. © 2012 Elsevier Ltd. |
| format |
JOUR |
| author |
Payrola, P.A. Hongn, F. Cristallini, E. García, V. del Papa, C. |
| author_facet |
Payrola, P.A. Hongn, F. Cristallini, E. García, V. del Papa, C. |
| author_sort |
Payrola, P.A. |
| title |
Andean oblique folds in the Cordillera Oriental - Northwestern Argentina: Insights from analogue models |
| title_short |
Andean oblique folds in the Cordillera Oriental - Northwestern Argentina: Insights from analogue models |
| title_full |
Andean oblique folds in the Cordillera Oriental - Northwestern Argentina: Insights from analogue models |
| title_fullStr |
Andean oblique folds in the Cordillera Oriental - Northwestern Argentina: Insights from analogue models |
| title_full_unstemmed |
Andean oblique folds in the Cordillera Oriental - Northwestern Argentina: Insights from analogue models |
| title_sort |
andean oblique folds in the cordillera oriental - northwestern argentina: insights from analogue models |
| url |
http://hdl.handle.net/20.500.12110/paper_01918141_v42_n_p194_Payrola |
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