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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Detalles Bibliográficos
Publicado: 2014
Materias:
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
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v79_n_p1_Bechis
http://hdl.handle.net/20.500.12110/paper_02643707_v79_n_p1_Bechis
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_02643707_v79_n_p1_Bechis
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spelling paper:paper_02643707_v79_n_p1_Bechis2023-06-08T15:23:00Z 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 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. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v79_n_p1_Bechis 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
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.
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
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v79_n_p1_Bechis
http://hdl.handle.net/20.500.12110/paper_02643707_v79_n_p1_Bechis
_version_ 1768543943574683648

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