The "Ñireco Caldera" in the central-western Neuquén Andes (38°50'S - 70°50'O)

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In the southern segment of the Copahue- Pino Hachado block, next to the Moquehue-Alumine lacustrine basin, an anomalous concentration of calderas, resulting from a Pliocene-Quaternary volcanic activity was recognized. The Ñireco caldera, which was proposed as part of this caldera complex, is the rea...

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Autores principales: González Díaz, E.F., García Morabito, E.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2010
Materias:
Caldera
Catan Lil
Copahue-Pino Hachado Block
caldera
fold and thrust belt
geomorphological response
granitoid
morphostructure
Paleozoic
Pliocene-Pleistocene boundary
structural geology
tectonic setting
Triassic
volcaniclastic deposit
volcanism
Argentina
Neuquen
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v67_n2_p177_GonzalezDiaz
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_00044822_v67_n2_p177_GonzalezDiaz2023-06-12T16:40:33Z The "Ñireco Caldera" in the central-western Neuquén Andes (38°50'S - 70°50'O) Rev. Asoc. Geol. Argent. 2010;67(2):177-185 González Díaz, E.F. García Morabito, E. Caldera Catan Lil Copahue-Pino Hachado Block caldera fold and thrust belt geomorphological response granitoid morphostructure Paleozoic Pliocene-Pleistocene boundary structural geology tectonic setting Triassic volcaniclastic deposit volcanism Argentina Neuquen In the southern segment of the Copahue- Pino Hachado block, next to the Moquehue-Alumine lacustrine basin, an anomalous concentration of calderas, resulting from a Pliocene-Quaternary volcanic activity was recognized. The Ñireco caldera, which was proposed as part of this caldera complex, is the reason of the present work. The authors object the interpretation of such a morphostructural feature on the basis of a detailed geomorphologic, structural and stratigraphic analyses of the area. The limits of the proposed caldera coincide mostly with fluvial valleys that seem to be controlled by previous structures like faults and regional lineaments. There are no evidences that could suggest the presence of a volcanic complex that theoretically contains such a depression, or for its external and internal flanks. The central sector of the proposed caldera presents the highest altitude values of the region (± 2,900 m a.s.l.), which highly surpass those of the Principal Cordillera at these latitudes. The local stratigraphy of the area, is dominated by the oldest rocks of the region (Upper Paleozoic granitoids and Triassic volcanic and volcaniclastic sequences), and shows not temporal coincidence with the Pliocene-Quaternary volcanic activity, well represented immediately to the north. The study area falls on the contrary into a thick-skinned west-verging fold-and-thrust-belt, where tectonic inversion played a central role. Fil:García Morabito, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 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_v67_n2_p177_GonzalezDiaz
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 Caldera
Catan Lil
Copahue-Pino Hachado Block
caldera
fold and thrust belt
geomorphological response
granitoid
morphostructure
Paleozoic
Pliocene-Pleistocene boundary
structural geology
tectonic setting
Triassic
volcaniclastic deposit
volcanism
Argentina
Neuquen
spellingShingle Caldera
Catan Lil
Copahue-Pino Hachado Block
caldera
fold and thrust belt
geomorphological response
granitoid
morphostructure
Paleozoic
Pliocene-Pleistocene boundary
structural geology
tectonic setting
Triassic
volcaniclastic deposit
volcanism
Argentina
Neuquen
González Díaz, E.F.
García Morabito, E.
The "Ñireco Caldera" in the central-western Neuquén Andes (38°50'S - 70°50'O)
topic_facet Caldera
Catan Lil
Copahue-Pino Hachado Block
caldera
fold and thrust belt
geomorphological response
granitoid
morphostructure
Paleozoic
Pliocene-Pleistocene boundary
structural geology
tectonic setting
Triassic
volcaniclastic deposit
volcanism
Argentina
Neuquen
description In the southern segment of the Copahue- Pino Hachado block, next to the Moquehue-Alumine lacustrine basin, an anomalous concentration of calderas, resulting from a Pliocene-Quaternary volcanic activity was recognized. The Ñireco caldera, which was proposed as part of this caldera complex, is the reason of the present work. The authors object the interpretation of such a morphostructural feature on the basis of a detailed geomorphologic, structural and stratigraphic analyses of the area. The limits of the proposed caldera coincide mostly with fluvial valleys that seem to be controlled by previous structures like faults and regional lineaments. There are no evidences that could suggest the presence of a volcanic complex that theoretically contains such a depression, or for its external and internal flanks. The central sector of the proposed caldera presents the highest altitude values of the region (± 2,900 m a.s.l.), which highly surpass those of the Principal Cordillera at these latitudes. The local stratigraphy of the area, is dominated by the oldest rocks of the region (Upper Paleozoic granitoids and Triassic volcanic and volcaniclastic sequences), and shows not temporal coincidence with the Pliocene-Quaternary volcanic activity, well represented immediately to the north. The study area falls on the contrary into a thick-skinned west-verging fold-and-thrust-belt, where tectonic inversion played a central role.
format Artículo
Artículo
publishedVersion
author González Díaz, E.F.
García Morabito, E.
author_facet González Díaz, E.F.
García Morabito, E.
author_sort González Díaz, E.F.
title The "Ñireco Caldera" in the central-western Neuquén Andes (38°50'S - 70°50'O)
title_short The "Ñireco Caldera" in the central-western Neuquén Andes (38°50'S - 70°50'O)
title_full The "Ñireco Caldera" in the central-western Neuquén Andes (38°50'S - 70°50'O)
title_fullStr The "Ñireco Caldera" in the central-western Neuquén Andes (38°50'S - 70°50'O)
title_full_unstemmed The "Ñireco Caldera" in the central-western Neuquén Andes (38°50'S - 70°50'O)
title_sort "ñireco caldera" in the central-western neuquén andes (38°50's - 70°50'o)
publishDate 2010
url http://hdl.handle.net/20.500.12110/paper_00044822_v67_n2_p177_GonzalezDiaz
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