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...
Guardado en:
Publicado: |
2007
|
---|---|
Materias: | |
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 |
Aporte de: |
id |
paper:paper_01956671_v28_n6_p961_Armella |
---|---|
record_format |
dspace |
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 |