Transtensional tectonics induced by oblique reactivation of previous lithospheric anisotropies during the Late Triassic to Early Jurassic rifting in the Neuquén basin: Insights from analog models
The goal of this study was to determine the main factors that controlled the kinematic evolution and the structural architecture developed during the Late Triassic to Early Jurassic rifting that led to the opening of the Neuquén basin in the southwestern sector of Gondwana. We carried out a series o...
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todo:paper_02643707_v79_n_p1_Bechis2023-10-03T15:12:46Z Transtensional tectonics induced by oblique reactivation of previous lithospheric anisotropies during the Late Triassic to Early Jurassic rifting in the Neuquén basin: Insights from analog models Bechis, F. Cristallini, E.O. Giambiagi, L.B. Yagupsky, D.L. Guzmán, C.G. García, V.H. Analog modeling Central Andes Neuquén basin Oblique rifting Structural inheritance Western Gondwana continental margin Gondwana Jurassic lithospheric structure oblique fault rifting structural geology tectonic evolution tectonic setting transtension Triassic Argentina Neuquen Basin The goal of this study was to determine the main factors that controlled the kinematic evolution and the structural architecture developed during the Late Triassic to Early Jurassic rifting that led to the opening of the Neuquén basin in the southwestern sector of Gondwana. We carried out a series of analog models to simulate an extensional system with a bent geometry similar to the northeastern border of the basin. In different experiments, we varied the extension direction between NNE (N10°E) and NE (N45°E) orientations, inducing rift systems with different degrees of obliquity in each sector of the extended area. We compared the kinematic evolution and the final structural architecture observed in the experiments with data from two selected representative areas of the basin: (1) the Atuel depocenter, situated in the northern Andean sector, and (2) the Entre Lomas area, situated in the northeastern Neuquén Embayment. In both cases, the good match between the field and subsurface data and the results of the analog models supports a NNE orientation of the regional extension (N30°E-N20°E) during the synrift stage. Our experimental results suggest that lithospheric weakness zones of NNW to NW trend could have controlled and localized the extension in the Neuquén basin. These previous anisotropies were linked to the sutures and rheological contrasts generated during the collision of terranes against the southwestern margin of Gondwana during the Paleozoic, as well as further modifications of the thermo-mechanical state of the lithosphere during the Late Paleozoic to Early Mesozoic evolution. © 2014 Elsevier Ltd. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02643707_v79_n_p1_Bechis |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Analog modeling Central Andes Neuquén basin Oblique rifting Structural inheritance Western Gondwana continental margin Gondwana Jurassic lithospheric structure oblique fault rifting structural geology tectonic evolution tectonic setting transtension Triassic Argentina Neuquen Basin |
spellingShingle |
Analog modeling Central Andes Neuquén basin Oblique rifting Structural inheritance Western Gondwana continental margin Gondwana Jurassic lithospheric structure oblique fault rifting structural geology tectonic evolution tectonic setting transtension Triassic Argentina Neuquen Basin Bechis, F. Cristallini, E.O. Giambiagi, L.B. Yagupsky, D.L. Guzmán, C.G. García, V.H. Transtensional tectonics induced by oblique reactivation of previous lithospheric anisotropies during the Late Triassic to Early Jurassic rifting in the Neuquén basin: Insights from analog models |
topic_facet |
Analog modeling Central Andes Neuquén basin Oblique rifting Structural inheritance Western Gondwana continental margin Gondwana Jurassic lithospheric structure oblique fault rifting structural geology tectonic evolution tectonic setting transtension Triassic Argentina Neuquen Basin |
description |
The goal of this study was to determine the main factors that controlled the kinematic evolution and the structural architecture developed during the Late Triassic to Early Jurassic rifting that led to the opening of the Neuquén basin in the southwestern sector of Gondwana. We carried out a series of analog models to simulate an extensional system with a bent geometry similar to the northeastern border of the basin. In different experiments, we varied the extension direction between NNE (N10°E) and NE (N45°E) orientations, inducing rift systems with different degrees of obliquity in each sector of the extended area. We compared the kinematic evolution and the final structural architecture observed in the experiments with data from two selected representative areas of the basin: (1) the Atuel depocenter, situated in the northern Andean sector, and (2) the Entre Lomas area, situated in the northeastern Neuquén Embayment. In both cases, the good match between the field and subsurface data and the results of the analog models supports a NNE orientation of the regional extension (N30°E-N20°E) during the synrift stage. Our experimental results suggest that lithospheric weakness zones of NNW to NW trend could have controlled and localized the extension in the Neuquén basin. These previous anisotropies were linked to the sutures and rheological contrasts generated during the collision of terranes against the southwestern margin of Gondwana during the Paleozoic, as well as further modifications of the thermo-mechanical state of the lithosphere during the Late Paleozoic to Early Mesozoic evolution. © 2014 Elsevier Ltd. |
format |
JOUR |
author |
Bechis, F. Cristallini, E.O. Giambiagi, L.B. Yagupsky, D.L. Guzmán, C.G. García, V.H. |
author_facet |
Bechis, F. Cristallini, E.O. Giambiagi, L.B. Yagupsky, D.L. Guzmán, C.G. García, V.H. |
author_sort |
Bechis, F. |
title |
Transtensional tectonics induced by oblique reactivation of previous lithospheric anisotropies during the Late Triassic to Early Jurassic rifting in the Neuquén basin: Insights from analog models |
title_short |
Transtensional tectonics induced by oblique reactivation of previous lithospheric anisotropies during the Late Triassic to Early Jurassic rifting in the Neuquén basin: Insights from analog models |
title_full |
Transtensional tectonics induced by oblique reactivation of previous lithospheric anisotropies during the Late Triassic to Early Jurassic rifting in the Neuquén basin: Insights from analog models |
title_fullStr |
Transtensional tectonics induced by oblique reactivation of previous lithospheric anisotropies during the Late Triassic to Early Jurassic rifting in the Neuquén basin: Insights from analog models |
title_full_unstemmed |
Transtensional tectonics induced by oblique reactivation of previous lithospheric anisotropies during the Late Triassic to Early Jurassic rifting in the Neuquén basin: Insights from analog models |
title_sort |
transtensional tectonics induced by oblique reactivation of previous lithospheric anisotropies during the late triassic to early jurassic rifting in the neuquén basin: insights from analog models |
url |
http://hdl.handle.net/20.500.12110/paper_02643707_v79_n_p1_Bechis |
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