Kinematic analysis of a transtensional fault system: The Atuel depocenter of the Neuquén basin, southern Central Andes, Argentina

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The Atuel depocenter of the Neuquén basin originated as an Upper Triassic to Lower Jurassic rift system, later inverted during the Andean contractional deformation. In order to study the extensional architecture and the kinematic evolution of this depocenter, we collected a large amount of field and...

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Autores principales: Bechis, Florencia, Giambiagi, Laura Beatriz, García, Víctor Hugo, Lanés, Silvia, Cristallini, Ernesto Osvaldo, Tunik, Maísa Andrea
Publicado: 2010
Materias:
Central Andes
Kinematic analysis
Neuquén basin
Oblique rift
Transtension
Argentina
Bimodal distribution
Facies distribution
Fault system
Fourth order
General trends
Jurassic
Kinematic evolution
Kinematic indicators
Lithospheric
Normal faults
Paleozoic
Rift systems
Second orders
Shear zone
Structural data
Sub-surfaces
Subbasins
Syn-rift
Upper Triassic
Angular distribution
Geochronology
Kinematics
depocenter
extensional tectonics
kinematics
oblique fault
rift zone
tectonic evolution
transtension
Andes
Neuquen Basin
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01918141_v32_n7_p886_Bechis
http://hdl.handle.net/20.500.12110/paper_01918141_v32_n7_p886_Bechis
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_01918141_v32_n7_p886_Bechis2023-06-08T15:19:53Z Kinematic analysis of a transtensional fault system: The Atuel depocenter of the Neuquén basin, southern Central Andes, Argentina Bechis, Florencia Giambiagi, Laura Beatriz García, Víctor Hugo Lanés, Silvia Cristallini, Ernesto Osvaldo Tunik, Maísa Andrea Central Andes Kinematic analysis Neuquén basin Oblique rift Transtension Argentina Bimodal distribution Central Andes Facies distribution Fault system Fourth order General trends Jurassic Kinematic analysis Kinematic evolution Kinematic indicators Lithospheric Normal faults Oblique rift Paleozoic Rift systems Second orders Shear zone Structural data Sub-surfaces Subbasins Syn-rift Transtension Upper Triassic Angular distribution Geochronology Kinematics depocenter extensional tectonics kinematics oblique fault rift zone tectonic evolution transtension Andes Argentina Neuquen Basin The Atuel depocenter of the Neuquén basin originated as an Upper Triassic to Lower Jurassic rift system, later inverted during the Andean contractional deformation. In order to study the extensional architecture and the kinematic evolution of this depocenter, we collected a large amount of field and sub-surface data, consisting of slip data from outcrop-scale normal faults, thickness and facies distribution within the synrift deposits, and structural data from angular and progressive unconformities. The Atuel depocenter has a NNW trend, showing a bimodal distribution of NNW and WNW major faults (first and second order faults). On the other hand, from kinematic indicators measured on outcrop-scale faults (third and fourth order faults), we found a mean NE internal extension direction, which is oblique to the general trend of the sub-basin. Taking these particular characteristics into account, we interpreted the Atuel depocenter as an oblique rift system. We evaluated two mechanisms in order to explain the development of this transtensional system: 1) reactivation of upper-crustal NNW-oriented Paleozoic shear zones, and 2) oblique stretching of a previous NNW-oriented lithospheric weakness zone. © 2010 Elsevier Ltd. Fil:Bechis, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Giambiagi, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:García, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lanés, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cristallini, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tunik, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01918141_v32_n7_p886_Bechis http://hdl.handle.net/20.500.12110/paper_01918141_v32_n7_p886_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 Central Andes
Kinematic analysis
Neuquén basin
Oblique rift
Transtension
Argentina
Bimodal distribution
Central Andes
Facies distribution
Fault system
Fourth order
General trends
Jurassic
Kinematic analysis
Kinematic evolution
Kinematic indicators
Lithospheric
Normal faults
Oblique rift
Paleozoic
Rift systems
Second orders
Shear zone
Structural data
Sub-surfaces
Subbasins
Syn-rift
Transtension
Upper Triassic
Angular distribution
Geochronology
Kinematics
depocenter
extensional tectonics
kinematics
oblique fault
rift zone
tectonic evolution
transtension
Andes
Argentina
Neuquen Basin
spellingShingle Central Andes
Kinematic analysis
Neuquén basin
Oblique rift
Transtension
Argentina
Bimodal distribution
Central Andes
Facies distribution
Fault system
Fourth order
General trends
Jurassic
Kinematic analysis
Kinematic evolution
Kinematic indicators
Lithospheric
Normal faults
Oblique rift
Paleozoic
Rift systems
Second orders
Shear zone
Structural data
Sub-surfaces
Subbasins
Syn-rift
Transtension
Upper Triassic
Angular distribution
Geochronology
Kinematics
depocenter
extensional tectonics
kinematics
oblique fault
rift zone
tectonic evolution
transtension
Andes
Argentina
Neuquen Basin
Bechis, Florencia
Giambiagi, Laura Beatriz
García, Víctor Hugo
Lanés, Silvia
Cristallini, Ernesto Osvaldo
Tunik, Maísa Andrea
Kinematic analysis of a transtensional fault system: The Atuel depocenter of the Neuquén basin, southern Central Andes, Argentina
topic_facet Central Andes
Kinematic analysis
Neuquén basin
Oblique rift
Transtension
Argentina
Bimodal distribution
Central Andes
Facies distribution
Fault system
Fourth order
General trends
Jurassic
Kinematic analysis
Kinematic evolution
Kinematic indicators
Lithospheric
Normal faults
Oblique rift
Paleozoic
Rift systems
Second orders
Shear zone
Structural data
Sub-surfaces
Subbasins
Syn-rift
Transtension
Upper Triassic
Angular distribution
Geochronology
Kinematics
depocenter
extensional tectonics
kinematics
oblique fault
rift zone
tectonic evolution
transtension
Andes
Argentina
Neuquen Basin
description The Atuel depocenter of the Neuquén basin originated as an Upper Triassic to Lower Jurassic rift system, later inverted during the Andean contractional deformation. In order to study the extensional architecture and the kinematic evolution of this depocenter, we collected a large amount of field and sub-surface data, consisting of slip data from outcrop-scale normal faults, thickness and facies distribution within the synrift deposits, and structural data from angular and progressive unconformities. The Atuel depocenter has a NNW trend, showing a bimodal distribution of NNW and WNW major faults (first and second order faults). On the other hand, from kinematic indicators measured on outcrop-scale faults (third and fourth order faults), we found a mean NE internal extension direction, which is oblique to the general trend of the sub-basin. Taking these particular characteristics into account, we interpreted the Atuel depocenter as an oblique rift system. We evaluated two mechanisms in order to explain the development of this transtensional system: 1) reactivation of upper-crustal NNW-oriented Paleozoic shear zones, and 2) oblique stretching of a previous NNW-oriented lithospheric weakness zone. © 2010 Elsevier Ltd.
author Bechis, Florencia
Giambiagi, Laura Beatriz
García, Víctor Hugo
Lanés, Silvia
Cristallini, Ernesto Osvaldo
Tunik, Maísa Andrea
author_facet Bechis, Florencia
Giambiagi, Laura Beatriz
García, Víctor Hugo
Lanés, Silvia
Cristallini, Ernesto Osvaldo
Tunik, Maísa Andrea
author_sort Bechis, Florencia
title Kinematic analysis of a transtensional fault system: The Atuel depocenter of the Neuquén basin, southern Central Andes, Argentina
title_short Kinematic analysis of a transtensional fault system: The Atuel depocenter of the Neuquén basin, southern Central Andes, Argentina
title_full Kinematic analysis of a transtensional fault system: The Atuel depocenter of the Neuquén basin, southern Central Andes, Argentina
title_fullStr Kinematic analysis of a transtensional fault system: The Atuel depocenter of the Neuquén basin, southern Central Andes, Argentina
title_full_unstemmed Kinematic analysis of a transtensional fault system: The Atuel depocenter of the Neuquén basin, southern Central Andes, Argentina
title_sort kinematic analysis of a transtensional fault system: the atuel depocenter of the neuquén basin, southern central andes, argentina
publishDate 2010
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01918141_v32_n7_p886_Bechis
http://hdl.handle.net/20.500.12110/paper_01918141_v32_n7_p886_Bechis
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