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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Autores principales:	Ciccioli, P.L., Limarino, C.O., Marenssi, S.A.
Formato:	Artículo publishedVersion
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 http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v60_n1_p251_Ciccioli_oai
Aporte de:	Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires

id	I28-R145-paper_00044822_v60_n1_p251_Ciccioli_oai
record_format	dspace
spelling	I28-R145-paper_00044822_v60_n1_p251_Ciccioli_oai2020-10-19 Ciccioli, P.L. Limarino, C.O. Marenssi, S.A. 2005 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. application/pdf http://hdl.handle.net/20.500.12110/paper_00044822_v60_n1_p251_Ciccioli info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Rev. Asoc. Geol. Argent. 2005;60(1):251-254 K/Ar ages La Rioja Province Toro Negro Formation Upper Miocene New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v60_n1_p251_Ciccioli_oai
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-145
collection	Repositorio Digital de la Universidad de Buenos Aires (UBA)
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 http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v60_n1_p251_Ciccioli_oai
work_keys_str_mv	AT cicciolipl newradiometricagesforthetoronegroformationinthesierradeloscoloradosnorthwesternsierraspampeanas AT limarinoco newradiometricagesforthetoronegroformationinthesierradeloscoloradosnorthwesternsierraspampeanas AT marenssisa newradiometricagesforthetoronegroformationinthesierradeloscoloradosnorthwesternsierraspampeanas
_version_	1766026479117795328

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

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