Tidally dominated, rimmed-shelf facies of the Picún Leufú Formation (Jurassic/Cretaceous boundary) in southwest Gondwana, Neuquén Basin, Argentina

A palaeoenvironmental model for the Picún Leufú Formation (Jurassic/Cretaceous boundary), which crops out in the Neuquén Basin, Argentina, on the southwestern margin of Gondwana, is presented in this paper for the first time. Detailed stratigraphic sections exposed along National Road 40 where it cr...

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Publicado: 2007
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Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v28_n6_p961_Armella
http://hdl.handle.net/20.500.12110/paper_01956671_v28_n6_p961_Armella
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spelling paper:paper_01956671_v28_n6_p961_Armella2023-06-08T15:20:10Z Tidally dominated, rimmed-shelf facies of the Picún Leufú Formation (Jurassic/Cretaceous boundary) in southwest Gondwana, Neuquén Basin, Argentina Argentina Carbonate shelf Facies/microfacies analysis Jurassic/Cretaceous boundary Neuquén Basin Palaeontology Picún Leufú Formation Sedimentology bar benthos biostratigraphy carbonate sediment facies analysis formation mechanism Jurassic-Cretaceous boundary paleoenvironment shelf sediment taphonomy wave propagation Argentina Neuquen Basin South America A palaeoenvironmental model for the Picún Leufú Formation (Jurassic/Cretaceous boundary), which crops out in the Neuquén Basin, Argentina, on the southwestern margin of Gondwana, is presented in this paper for the first time. Detailed stratigraphic sections exposed along National Road 40 where it crosses the Picún Leufú Creek (type locality) and in the Cerrito Caracoles area, were examined and sampled. Based on a combination of the sedimentological data obtained (facies/microfacies analysis) and the relationship between benthic macrofaunas and their taphonomic attributes, it is concluded that the formation reflects a tidally dominated, rimmed-shelf setting characterized by prograding bars dissected by channels and thick lagoonal facies with shoal developments. In the Cerrito Caracoles area, where only the basal part of the formation is exposed, it is interpreted to have been deposited in a shallow subtidal marine environment in which shelf margin facies with patch reefs have been recognized. © 2007 Elsevier Ltd. All rights reserved. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v28_n6_p961_Armella http://hdl.handle.net/20.500.12110/paper_01956671_v28_n6_p961_Armella
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Carbonate shelf
Facies/microfacies analysis
Jurassic/Cretaceous boundary
Neuquén Basin
Palaeontology
Picún Leufú Formation
Sedimentology
bar
benthos
biostratigraphy
carbonate sediment
facies analysis
formation mechanism
Jurassic-Cretaceous boundary
paleoenvironment
shelf sediment
taphonomy
wave propagation
Argentina
Neuquen Basin
South America
spellingShingle Argentina
Carbonate shelf
Facies/microfacies analysis
Jurassic/Cretaceous boundary
Neuquén Basin
Palaeontology
Picún Leufú Formation
Sedimentology
bar
benthos
biostratigraphy
carbonate sediment
facies analysis
formation mechanism
Jurassic-Cretaceous boundary
paleoenvironment
shelf sediment
taphonomy
wave propagation
Argentina
Neuquen Basin
South America
Tidally dominated, rimmed-shelf facies of the Picún Leufú Formation (Jurassic/Cretaceous boundary) in southwest Gondwana, Neuquén Basin, Argentina
topic_facet Argentina
Carbonate shelf
Facies/microfacies analysis
Jurassic/Cretaceous boundary
Neuquén Basin
Palaeontology
Picún Leufú Formation
Sedimentology
bar
benthos
biostratigraphy
carbonate sediment
facies analysis
formation mechanism
Jurassic-Cretaceous boundary
paleoenvironment
shelf sediment
taphonomy
wave propagation
Argentina
Neuquen Basin
South America
description A palaeoenvironmental model for the Picún Leufú Formation (Jurassic/Cretaceous boundary), which crops out in the Neuquén Basin, Argentina, on the southwestern margin of Gondwana, is presented in this paper for the first time. Detailed stratigraphic sections exposed along National Road 40 where it crosses the Picún Leufú Creek (type locality) and in the Cerrito Caracoles area, were examined and sampled. Based on a combination of the sedimentological data obtained (facies/microfacies analysis) and the relationship between benthic macrofaunas and their taphonomic attributes, it is concluded that the formation reflects a tidally dominated, rimmed-shelf setting characterized by prograding bars dissected by channels and thick lagoonal facies with shoal developments. In the Cerrito Caracoles area, where only the basal part of the formation is exposed, it is interpreted to have been deposited in a shallow subtidal marine environment in which shelf margin facies with patch reefs have been recognized. © 2007 Elsevier Ltd. All rights reserved.
title Tidally dominated, rimmed-shelf facies of the Picún Leufú Formation (Jurassic/Cretaceous boundary) in southwest Gondwana, Neuquén Basin, Argentina
title_short Tidally dominated, rimmed-shelf facies of the Picún Leufú Formation (Jurassic/Cretaceous boundary) in southwest Gondwana, Neuquén Basin, Argentina
title_full Tidally dominated, rimmed-shelf facies of the Picún Leufú Formation (Jurassic/Cretaceous boundary) in southwest Gondwana, Neuquén Basin, Argentina
title_fullStr Tidally dominated, rimmed-shelf facies of the Picún Leufú Formation (Jurassic/Cretaceous boundary) in southwest Gondwana, Neuquén Basin, Argentina
title_full_unstemmed Tidally dominated, rimmed-shelf facies of the Picún Leufú Formation (Jurassic/Cretaceous boundary) in southwest Gondwana, Neuquén Basin, Argentina
title_sort tidally dominated, rimmed-shelf facies of the picún leufú formation (jurassic/cretaceous boundary) in southwest gondwana, neuquén basin, argentina
publishDate 2007
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v28_n6_p961_Armella
http://hdl.handle.net/20.500.12110/paper_01956671_v28_n6_p961_Armella
_version_ 1768543177894002688