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:	JOUR
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

id	todo:paper_00044822_v60_n1_p251_Ciccioli
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spelling	todo:paper_00044822_v60_n1_p251_Ciccioli2023-10-03T13:58:05Z New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas 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. JOUR 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)
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	JOUR
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
url	http://hdl.handle.net/20.500.12110/paper_00044822_v60_n1_p251_Ciccioli
work_keys_str_mv	AT cicciolipl newradiometricagesforthetoronegroformationinthesierradeloscoloradosnorthwesternsierraspampeanas AT limarinoco newradiometricagesforthetoronegroformationinthesierradeloscoloradosnorthwesternsierraspampeanas AT marenssisa newradiometricagesforthetoronegroformationinthesierradeloscoloradosnorthwesternsierraspampeanas
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New radiometric ages for the Toro Negro Formation in the Sierra de los Colorados, northwestern Sierras Pampeanas

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