Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary evolution of the first transgression

The present paper interprets and discusses the Late Triassic-Early Jurassic of the first transgression at northern Neuquén basin (Argentina) and its paleostructural control due to ancient horsts and half-grabens. Six vertical sections were chosen along two east-west and north-south transects. Deposi...

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Autor principal: Lanés, S.
Formato: JOUR
Materias:
Lower Jurassic
Neuquén Basin
Sedimentology
Tectonics
Upper Triassic
Mesozoic
transgression
Argentina
Neuquen Basin
South America
Western Hemisphere
World
Ammonoidea
Bivalvia
Brachiopoda
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_16956133_v3_n2_p81_Lanes
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_16956133_v3_n2_p81_Lanes
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spelling todo:paper_16956133_v3_n2_p81_Lanes2023-10-03T16:29:59Z Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary evolution of the first transgression Lanés, S. Lower Jurassic Neuquén Basin Sedimentology Tectonics Upper Triassic Mesozoic transgression Argentina Neuquen Basin South America Western Hemisphere World Ammonoidea Bivalvia Brachiopoda The present paper interprets and discusses the Late Triassic-Early Jurassic of the first transgression at northern Neuquén basin (Argentina) and its paleostructural control due to ancient horsts and half-grabens. Six vertical sections were chosen along two east-west and north-south transects. Depositional systems have been determined and correlated by means of ammonite, bivalve and brachiopod biostratigraphy. Two regions can be distinguished based on the areal distribution of the contemporaneous depositional systems in the studied area; one at the east and the other to the west of El Freno creek. Vertical sections in the western region record shallowing-upward fluvio-dominated, transverse, normal-fault-controlled, slope-type fan deltas and intermediate shelf to Gilbert-type fan deltas. Vertical sections in the eastern region record a transgressive siliciclastic storm-dominated shelf, evolving from wave-dominated estuary to turbidity current influenced outer shelf. Accommodation vs. sedimentary supply ratio leads to identification of two stages of differing tectonic behaviour. The first one (Rhaetian-late Early Sinemurian) shows an accomodation greater than the sedimentary supply leading to the deposition of the western slope-type fan deltas. The second stage (late Early Sinemurian-Toarcian) shows a varying accommodation: during the late Early Sinemurian, accommodation was outpaced by sedimentary supply leading the intermediate-type fan delta to prograde. Later (late Early Sinemurian-Toarcian), accommodation exceeded the supply again, allowing transgression of the marine shelf and the increase in the marine depositional area. The two stages coincided with synrift and sag phases previously proposed for the southern Neuquén basin. © UB-ICTJA. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_16956133_v3_n2_p81_Lanes
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Lower Jurassic
Neuquén Basin
Sedimentology
Tectonics
Upper Triassic
Mesozoic
transgression
Argentina
Neuquen Basin
South America
Western Hemisphere
World
Ammonoidea
Bivalvia
Brachiopoda
spellingShingle Lower Jurassic
Neuquén Basin
Sedimentology
Tectonics
Upper Triassic
Mesozoic
transgression
Argentina
Neuquen Basin
South America
Western Hemisphere
World
Ammonoidea
Bivalvia
Brachiopoda
Lanés, S.
Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary evolution of the first transgression
topic_facet Lower Jurassic
Neuquén Basin
Sedimentology
Tectonics
Upper Triassic
Mesozoic
transgression
Argentina
Neuquen Basin
South America
Western Hemisphere
World
Ammonoidea
Bivalvia
Brachiopoda
description The present paper interprets and discusses the Late Triassic-Early Jurassic of the first transgression at northern Neuquén basin (Argentina) and its paleostructural control due to ancient horsts and half-grabens. Six vertical sections were chosen along two east-west and north-south transects. Depositional systems have been determined and correlated by means of ammonite, bivalve and brachiopod biostratigraphy. Two regions can be distinguished based on the areal distribution of the contemporaneous depositional systems in the studied area; one at the east and the other to the west of El Freno creek. Vertical sections in the western region record shallowing-upward fluvio-dominated, transverse, normal-fault-controlled, slope-type fan deltas and intermediate shelf to Gilbert-type fan deltas. Vertical sections in the eastern region record a transgressive siliciclastic storm-dominated shelf, evolving from wave-dominated estuary to turbidity current influenced outer shelf. Accommodation vs. sedimentary supply ratio leads to identification of two stages of differing tectonic behaviour. The first one (Rhaetian-late Early Sinemurian) shows an accomodation greater than the sedimentary supply leading to the deposition of the western slope-type fan deltas. The second stage (late Early Sinemurian-Toarcian) shows a varying accommodation: during the late Early Sinemurian, accommodation was outpaced by sedimentary supply leading the intermediate-type fan delta to prograde. Later (late Early Sinemurian-Toarcian), accommodation exceeded the supply again, allowing transgression of the marine shelf and the increase in the marine depositional area. The two stages coincided with synrift and sag phases previously proposed for the southern Neuquén basin. © UB-ICTJA.
format JOUR
author Lanés, S.
author_facet Lanés, S.
author_sort Lanés, S.
title Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary evolution of the first transgression
title_short Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary evolution of the first transgression
title_full Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary evolution of the first transgression
title_fullStr Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary evolution of the first transgression
title_full_unstemmed Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary evolution of the first transgression
title_sort late triassic to early jurassic sedimentation in northern neuquén basin, argentina: tectosedimentary evolution of the first transgression
url http://hdl.handle.net/20.500.12110/paper_16956133_v3_n2_p81_Lanes
work_keys_str_mv AT laness latetriassictoearlyjurassicsedimentationinnorthernneuquenbasinargentinatectosedimentaryevolutionofthefirsttransgression
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