New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas

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New absolute ages derived from whole rock K/Ar dating of two vitric tuffs collected from the upper-middle part of the Toro Negro Formation in the outcrops of the Sierra de Los Colorados, Sierras Pampeanas Noroccidentales (La Rioja Province) are presented herein. The obtained values of 8,6 ± 0,3 Ma a...

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Detalles Bibliográficos
Autores principales: Ciccioli, P.L., Limarino, C.O., Marenssi, S.A.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2005
Materias:
K/Ar ages
La Rioja Province
Toro Negro Formation
Upper Miocene
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v60_n1_p251_Ciccioli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_00044822_v60_n1_p251_Ciccioli2023-06-12T16:40:06Z New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas Rev. Asoc. Geol. Argent. 2005;60(1):251-254 Ciccioli, P.L. Limarino, C.O. Marenssi, S.A. K/Ar ages La Rioja Province Toro Negro Formation Upper Miocene New absolute ages derived from whole rock K/Ar dating of two vitric tuffs collected from the upper-middle part of the Toro Negro Formation in the outcrops of the Sierra de Los Colorados, Sierras Pampeanas Noroccidentales (La Rioja Province) are presented herein. The obtained values of 8,6 ± 0,3 Ma and 6,8 ± 0,2 Ma respectively, indicate an Upper Miocene age and challenge the previous Pliocene age proposed for this unit. The results pressented here have a high degree of confidence because they do not show evidences of reworking, mixing with terrigenous clastics nor diagenetic alteration. The tuff levels were mapped and georeferenced using GPS coordinates and their close location in the stratigraphic column provides an additional control for the obtained ages. © 2005 Asociación Geológica Argentina. Fil:Ciccioli, P.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Limarino, C.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Marenssi, S.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v60_n1_p251_Ciccioli
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic K/Ar ages
La Rioja Province
Toro Negro Formation
Upper Miocene
spellingShingle K/Ar ages
La Rioja Province
Toro Negro Formation
Upper Miocene
Ciccioli, P.L.
Limarino, C.O.
Marenssi, S.A.
New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas
topic_facet K/Ar ages
La Rioja Province
Toro Negro Formation
Upper Miocene
description New absolute ages derived from whole rock K/Ar dating of two vitric tuffs collected from the upper-middle part of the Toro Negro Formation in the outcrops of the Sierra de Los Colorados, Sierras Pampeanas Noroccidentales (La Rioja Province) are presented herein. The obtained values of 8,6 ± 0,3 Ma and 6,8 ± 0,2 Ma respectively, indicate an Upper Miocene age and challenge the previous Pliocene age proposed for this unit. The results pressented here have a high degree of confidence because they do not show evidences of reworking, mixing with terrigenous clastics nor diagenetic alteration. The tuff levels were mapped and georeferenced using GPS coordinates and their close location in the stratigraphic column provides an additional control for the obtained ages. © 2005 Asociación Geológica Argentina.
format Artículo
Artículo
publishedVersion
author Ciccioli, P.L.
Limarino, C.O.
Marenssi, S.A.
author_facet Ciccioli, P.L.
Limarino, C.O.
Marenssi, S.A.
author_sort Ciccioli, P.L.
title New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas
title_short New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas
title_full New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas
title_fullStr New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas
title_full_unstemmed New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas
title_sort new radiometric ages for the toro negro formation in the sierra de los colorados, northwestern sierras pampeanas
publishDate 2005
url http://hdl.handle.net/20.500.12110/paper_00044822_v60_n1_p251_Ciccioli
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AT limarinoco newradiometricagesforthetoronegroformationinthesierradeloscoloradosnorthwesternsierraspampeanas
AT marenssisa newradiometricagesforthetoronegroformationinthesierradeloscoloradosnorthwesternsierraspampeanas
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