High resolution isotopic ages for the early Miocene "Patagoniense" transgression in Southwest Patagonia: Stratigraphic implications

The classical marine Patagoniense succession at Lago Argentino, southwestern Patagonia (Argentina), known as Estancia 25 de Mayo Formation, was dated by radiometric U-Pb on zircon grains from pyroclastic rocks and 87Sr/ 86Sr ratio on calcitic oyster shells. U-Pb data yielded an age of 19.14 Ma for t...

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Autores principales: Cuitiño, J.I., Pimentel, M.M., Ventura Santos, R., Scasso, R.A.
Formato: JOUR
Materias:
Argentina
Austral basin
Geochronology
Miocene
Patagonia
Sr stratigraphy
Transgression
U-Pb ages
chemostratigraphy
chronostratigraphy
geochronology
isotopic analysis
resolution
strontium isotope
transgression
uranium-lead dating
Ostreidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v38_n_p110_Cuitino
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_08959811_v38_n_p110_Cuitino
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spelling todo:paper_08959811_v38_n_p110_Cuitino2023-10-03T15:43:03Z High resolution isotopic ages for the early Miocene "Patagoniense" transgression in Southwest Patagonia: Stratigraphic implications Cuitiño, J.I. Pimentel, M.M. Ventura Santos, R. Scasso, R.A. Argentina Austral basin Geochronology Miocene Patagonia Sr stratigraphy Transgression U-Pb ages chemostratigraphy chronostratigraphy geochronology isotopic analysis Miocene resolution strontium isotope transgression uranium-lead dating Patagonia Ostreidae The classical marine Patagoniense succession at Lago Argentino, southwestern Patagonia (Argentina), known as Estancia 25 de Mayo Formation, was dated by radiometric U-Pb on zircon grains from pyroclastic rocks and 87Sr/ 86Sr ratio on calcitic oyster shells. U-Pb data yielded an age of 19.14 Ma for the lower portion of the Patagoniense succession and 18.85 Ma for the lowermost part of the overlying Santa Cruz Formation. 87Sr/ 86Sr data yielded ages ranging from 20.05 Ma at the lower part and 19.1 Ma for the upper portion of the Estancia 25 de Mayo Formation, in good agreement with respect to the U-Pb results. Our results constrain the age of these beds entirely into the early Miocene Burdigalian stage, and locally into the Superpatagoniense stage. Correlation with other Patagoniense units in Santa Cruz, especially in the westernmost parts of the Austral Basin, reveals the existence of a shallow and extended sea, and lack of correlation with global sea-level highstands suggests a local Andean tectonic overprint as the cause of the sea level rise. © 2012 Elsevier Ltd. Fil:Cuitiño, J.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Scasso, R.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v38_n_p110_Cuitino
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
Austral basin
Geochronology
Miocene
Patagonia
Sr stratigraphy
Transgression
U-Pb ages
chemostratigraphy
chronostratigraphy
geochronology
isotopic analysis
Miocene
resolution
strontium isotope
transgression
uranium-lead dating
Patagonia
Ostreidae
spellingShingle Argentina
Austral basin
Geochronology
Miocene
Patagonia
Sr stratigraphy
Transgression
U-Pb ages
chemostratigraphy
chronostratigraphy
geochronology
isotopic analysis
Miocene
resolution
strontium isotope
transgression
uranium-lead dating
Patagonia
Ostreidae
Cuitiño, J.I.
Pimentel, M.M.
Ventura Santos, R.
Scasso, R.A.
High resolution isotopic ages for the early Miocene "Patagoniense" transgression in Southwest Patagonia: Stratigraphic implications
topic_facet Argentina
Austral basin
Geochronology
Miocene
Patagonia
Sr stratigraphy
Transgression
U-Pb ages
chemostratigraphy
chronostratigraphy
geochronology
isotopic analysis
Miocene
resolution
strontium isotope
transgression
uranium-lead dating
Patagonia
Ostreidae
description The classical marine Patagoniense succession at Lago Argentino, southwestern Patagonia (Argentina), known as Estancia 25 de Mayo Formation, was dated by radiometric U-Pb on zircon grains from pyroclastic rocks and 87Sr/ 86Sr ratio on calcitic oyster shells. U-Pb data yielded an age of 19.14 Ma for the lower portion of the Patagoniense succession and 18.85 Ma for the lowermost part of the overlying Santa Cruz Formation. 87Sr/ 86Sr data yielded ages ranging from 20.05 Ma at the lower part and 19.1 Ma for the upper portion of the Estancia 25 de Mayo Formation, in good agreement with respect to the U-Pb results. Our results constrain the age of these beds entirely into the early Miocene Burdigalian stage, and locally into the Superpatagoniense stage. Correlation with other Patagoniense units in Santa Cruz, especially in the westernmost parts of the Austral Basin, reveals the existence of a shallow and extended sea, and lack of correlation with global sea-level highstands suggests a local Andean tectonic overprint as the cause of the sea level rise. © 2012 Elsevier Ltd.
format JOUR
author Cuitiño, J.I.
Pimentel, M.M.
Ventura Santos, R.
Scasso, R.A.
author_facet Cuitiño, J.I.
Pimentel, M.M.
Ventura Santos, R.
Scasso, R.A.
author_sort Cuitiño, J.I.
title High resolution isotopic ages for the early Miocene "Patagoniense" transgression in Southwest Patagonia: Stratigraphic implications
title_short High resolution isotopic ages for the early Miocene "Patagoniense" transgression in Southwest Patagonia: Stratigraphic implications
title_full High resolution isotopic ages for the early Miocene "Patagoniense" transgression in Southwest Patagonia: Stratigraphic implications
title_fullStr High resolution isotopic ages for the early Miocene "Patagoniense" transgression in Southwest Patagonia: Stratigraphic implications
title_full_unstemmed High resolution isotopic ages for the early Miocene "Patagoniense" transgression in Southwest Patagonia: Stratigraphic implications
title_sort high resolution isotopic ages for the early miocene "patagoniense" transgression in southwest patagonia: stratigraphic implications
url http://hdl.handle.net/20.500.12110/paper_08959811_v38_n_p110_Cuitino
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AT venturasantosr highresolutionisotopicagesfortheearlymiocenepatagoniensetransgressioninsouthwestpatagoniastratigraphicimplications
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