Geomorphology of the Copahue Volcano region and vicinities (Central-western Neuquén)

This thematic map describes the principal features of the landscape, a relative sequence of its geomorphic evolution, and arrives to important conclusions about its regional stratigrapby. The regional landscape is composed and polycyclic. The geoforms are related to different exogenous processes (gl...

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Guardado en:
Detalles Bibliográficos
Publicado: 2005
Materias:
Caldera
Geomorphology
Glaciation Ice-blister
Rock-avalanches
Trapa
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n1_p72_GonzalezDiaz
http://hdl.handle.net/20.500.12110/paper_00044822_v60_n1_p72_GonzalezDiaz
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00044822_v60_n1_p72_GonzalezDiaz
record_format dspace
spelling paper:paper_00044822_v60_n1_p72_GonzalezDiaz2023-06-08T14:25:53Z Geomorphology of the Copahue Volcano region and vicinities (Central-western Neuquén) Caldera Geomorphology Glaciation Ice-blister Rock-avalanches Trapa This thematic map describes the principal features of the landscape, a relative sequence of its geomorphic evolution, and arrives to important conclusions about its regional stratigrapby. The regional landscape is composed and polycyclic. The geoforms are related to different exogenous processes (glacial, fluvial and mass-wasting). An endogenous process (volcanism) formed the more distinctive features; a great tectonic-volcanic caldera and the preglacial Copahue stratovolcano. Some minor and youngest volcanic forms were formed during postglacial times. A previous fluvial cycle was replaced by glacial morphogenesis (valley glaciation) during the Quaternary, due a climatic intervention. A huge and very thick (500-800 m) ice-blister was lodged into the caldera. The ice-blister exceded the caldera's edges forming several glacial diffluences and giving an important and additional supply to neighbouring glacial valleys (Hualcupén and Trocoman), out of to the depression. The Pleistocene glaciation shows two local cycles of volcanic eruptions: pre- and post-glacial. The origin of many local lakes was related to glacial exharation. Others lakes have different genesis: by blocking slide, crater-lake and glacial exharation associated with important structural weakness (Caviahue Lake related to the Trapa-Trapa lineament or Caviahue graben). During postglacial times important rock-avalanches occurred in the Hualcupén valley: the Cajón Chico and Compul rock-avalanches were related to seismic shocks. Previously, their accumulations were interpreted as terminal moraines of a second glaciation. A fluvial rejuvenation phase was the consequence of a blocking of Agrio River by the Agrio volcanic flows, during the Holocene. After that, the river eroded this obstacle restablishing its previous base level. The Agrio cascade represents the upstream present position of the consequent rejuvenation wave. © 2005 Asociación Geológica Argentina. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n1_p72_GonzalezDiaz http://hdl.handle.net/20.500.12110/paper_00044822_v60_n1_p72_GonzalezDiaz
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Caldera
Geomorphology
Glaciation Ice-blister
Rock-avalanches
Trapa
spellingShingle Caldera
Geomorphology
Glaciation Ice-blister
Rock-avalanches
Trapa
Geomorphology of the Copahue Volcano region and vicinities (Central-western Neuquén)
topic_facet Caldera
Geomorphology
Glaciation Ice-blister
Rock-avalanches
Trapa
description This thematic map describes the principal features of the landscape, a relative sequence of its geomorphic evolution, and arrives to important conclusions about its regional stratigrapby. The regional landscape is composed and polycyclic. The geoforms are related to different exogenous processes (glacial, fluvial and mass-wasting). An endogenous process (volcanism) formed the more distinctive features; a great tectonic-volcanic caldera and the preglacial Copahue stratovolcano. Some minor and youngest volcanic forms were formed during postglacial times. A previous fluvial cycle was replaced by glacial morphogenesis (valley glaciation) during the Quaternary, due a climatic intervention. A huge and very thick (500-800 m) ice-blister was lodged into the caldera. The ice-blister exceded the caldera's edges forming several glacial diffluences and giving an important and additional supply to neighbouring glacial valleys (Hualcupén and Trocoman), out of to the depression. The Pleistocene glaciation shows two local cycles of volcanic eruptions: pre- and post-glacial. The origin of many local lakes was related to glacial exharation. Others lakes have different genesis: by blocking slide, crater-lake and glacial exharation associated with important structural weakness (Caviahue Lake related to the Trapa-Trapa lineament or Caviahue graben). During postglacial times important rock-avalanches occurred in the Hualcupén valley: the Cajón Chico and Compul rock-avalanches were related to seismic shocks. Previously, their accumulations were interpreted as terminal moraines of a second glaciation. A fluvial rejuvenation phase was the consequence of a blocking of Agrio River by the Agrio volcanic flows, during the Holocene. After that, the river eroded this obstacle restablishing its previous base level. The Agrio cascade represents the upstream present position of the consequent rejuvenation wave. © 2005 Asociación Geológica Argentina.
title Geomorphology of the Copahue Volcano region and vicinities (Central-western Neuquén)
title_short Geomorphology of the Copahue Volcano region and vicinities (Central-western Neuquén)
title_full Geomorphology of the Copahue Volcano region and vicinities (Central-western Neuquén)
title_fullStr Geomorphology of the Copahue Volcano region and vicinities (Central-western Neuquén)
title_full_unstemmed Geomorphology of the Copahue Volcano region and vicinities (Central-western Neuquén)
title_sort geomorphology of the copahue volcano region and vicinities (central-western neuquén)
publishDate 2005
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n1_p72_GonzalezDiaz
http://hdl.handle.net/20.500.12110/paper_00044822_v60_n1_p72_GonzalezDiaz
_version_ 1768543063091707904

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