Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina

The Upper Jurassic Tordillo Formation at Cañada Ancha area, northern Neuquén Basin, Argentina, comprises a multi-stage suit of predominantly alluvial sediments that is heterolithic in nature. In that suit, several lithofacies, architectural elements, and bounding surfaces of different order have bee...

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Autores principales: López-Gómez, J., Martín-Chivelet, J., Palma, R.M.
Formato: JOUR
Materias:
Alluvial architecture
Argentina
Back-arc basin
Kimmeridgian
Neuquén Basin
Tordillo Formation
alluvial deposit
backarc basin
braided river
floodplain
sandstone
vertical distribution
Neuquen Basin
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00370738_v219_n1-4_p180_LopezGomez
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00370738_v219_n1-4_p180_LopezGomez2023-10-03T14:48:00Z Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina López-Gómez, J. Martín-Chivelet, J. Palma, R.M. Alluvial architecture Argentina Back-arc basin Kimmeridgian Neuquén Basin Tordillo Formation alluvial deposit backarc basin braided river floodplain Kimmeridgian sandstone vertical distribution Argentina Neuquen Basin South America The Upper Jurassic Tordillo Formation at Cañada Ancha area, northern Neuquén Basin, Argentina, comprises a multi-stage suit of predominantly alluvial sediments that is heterolithic in nature. In that suit, several lithofacies, architectural elements, and bounding surfaces of different order have been identified and their lateral and vertical distribution characterized. This analysis allowed the differentiation of 3 main units (lower, middle and upper), 20 subunits (C-1 to C-20), and the characterization of their alluvial styles. The lower unit (which comprises subunits C-1 to C-4) is mainly formed by fine- to medium-grained sandstones, which become medium- to coarse-grained towards the top. These sandstones characterize settings ranging from floodplains with isolated, unconfined flows, to more complex, vertically stacked, multi-storey sheet sandstones of braided fluvial systems. The middle unit (C-5 to C-10) is dominated by pale brown-grey fine-to coarse-grained sands and medium size subangular to angular conglomerates, which reflect amalgamated complexes of sandstone sheets and downstream accretion macroforms. Remarkably, this alluvial sedimentation was episodically punctuated by volcaniclastic flows. The upper unit (C-11 to C-20) consists of finer sediments, mainly pink to white fine-to medium grained sandstones and red to green siltstones. Towards the top, bioturbation becomes important, and also the presence of volcanosedimentary flows is noticeable. Fluvial settings include braided sheet sandstones with waning flood deposits evolving to isolated high-sinuosity fluvial systems, with flash flood deposits. At the top of this unit, facies may suggest marine influence. Vertical changes in the fluvial style result from both climatic and tectonic controls. A semiarid to arid climate and the active tectonism linked to the eastward migration of the Andean volcanic arc determined major bounding surfaces, fluvial style evolution and the presence of the volcano-sedimentary deposits. Different stages of high and low subsidence rates has been deduced from the vertical stacking of sediments. © 2009 Elsevier B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00370738_v219_n1-4_p180_LopezGomez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Alluvial architecture
Argentina
Back-arc basin
Kimmeridgian
Neuquén Basin
Tordillo Formation
alluvial deposit
backarc basin
braided river
floodplain
Kimmeridgian
sandstone
vertical distribution
Argentina
Neuquen Basin
South America
spellingShingle Alluvial architecture
Argentina
Back-arc basin
Kimmeridgian
Neuquén Basin
Tordillo Formation
alluvial deposit
backarc basin
braided river
floodplain
Kimmeridgian
sandstone
vertical distribution
Argentina
Neuquen Basin
South America
López-Gómez, J.
Martín-Chivelet, J.
Palma, R.M.
Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina
topic_facet Alluvial architecture
Argentina
Back-arc basin
Kimmeridgian
Neuquén Basin
Tordillo Formation
alluvial deposit
backarc basin
braided river
floodplain
Kimmeridgian
sandstone
vertical distribution
Argentina
Neuquen Basin
South America
description The Upper Jurassic Tordillo Formation at Cañada Ancha area, northern Neuquén Basin, Argentina, comprises a multi-stage suit of predominantly alluvial sediments that is heterolithic in nature. In that suit, several lithofacies, architectural elements, and bounding surfaces of different order have been identified and their lateral and vertical distribution characterized. This analysis allowed the differentiation of 3 main units (lower, middle and upper), 20 subunits (C-1 to C-20), and the characterization of their alluvial styles. The lower unit (which comprises subunits C-1 to C-4) is mainly formed by fine- to medium-grained sandstones, which become medium- to coarse-grained towards the top. These sandstones characterize settings ranging from floodplains with isolated, unconfined flows, to more complex, vertically stacked, multi-storey sheet sandstones of braided fluvial systems. The middle unit (C-5 to C-10) is dominated by pale brown-grey fine-to coarse-grained sands and medium size subangular to angular conglomerates, which reflect amalgamated complexes of sandstone sheets and downstream accretion macroforms. Remarkably, this alluvial sedimentation was episodically punctuated by volcaniclastic flows. The upper unit (C-11 to C-20) consists of finer sediments, mainly pink to white fine-to medium grained sandstones and red to green siltstones. Towards the top, bioturbation becomes important, and also the presence of volcanosedimentary flows is noticeable. Fluvial settings include braided sheet sandstones with waning flood deposits evolving to isolated high-sinuosity fluvial systems, with flash flood deposits. At the top of this unit, facies may suggest marine influence. Vertical changes in the fluvial style result from both climatic and tectonic controls. A semiarid to arid climate and the active tectonism linked to the eastward migration of the Andean volcanic arc determined major bounding surfaces, fluvial style evolution and the presence of the volcano-sedimentary deposits. Different stages of high and low subsidence rates has been deduced from the vertical stacking of sediments. © 2009 Elsevier B.V. All rights reserved.
format JOUR
author López-Gómez, J.
Martín-Chivelet, J.
Palma, R.M.
author_facet López-Gómez, J.
Martín-Chivelet, J.
Palma, R.M.
author_sort López-Gómez, J.
title Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina
title_short Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina
title_full Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina
title_fullStr Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina
title_full_unstemmed Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina
title_sort architecture and development of the alluvial sediments of the upper jurassic tordillo formation in the cañada ancha valley, northern neuquén basin, argentina
url http://hdl.handle.net/20.500.12110/paper_00370738_v219_n1-4_p180_LopezGomez
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