Constraints on the timing of debris-covered and rock glaciers: An exploratory case study in the Holar area, northern Iceland

Eighteen samples for 36Cl Cosmic-Ray Exposure (CRE) dating were taken from glacially polished bedrocks, moraine boulders, fossil/active rock glaciers and debris-covered glaciers in Fremri-Grjótárdalur and Hóladalur cirques in the Víðinesdalur, Hofsdalur and Héðinsdalur valleys, close to Hólar villag...

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Autores: Fernández Fernández, José María, Palacios Estremera, David, De Andrés de Pablo, Nuria, Schimmelpfennig, Irene, Tanarro García, Luis Miguel, Brynjólfsson, Skafti, López-Acevedo, Francisco J., Sæmundsson, Þorsteinn, A.S.T.E.R. Team
Formato: artículo
Fecha de publicación:2020
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/97069
Acesso em linha:https://hdl.handle.net/20.500.14352/97069
Access Level:acceso abierto
Palavra-chave:Iceland
Deglaciatio
Rock glaciers
Debris-covered glaciers
36Cl cosmic-ray exposure dating
Geografía física
2505.07 Geografía Física
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spelling Constraints on the timing of debris-covered and rock glaciers: An exploratory case study in the Holar area, northern IcelandFernández Fernández, José MaríaPalacios Estremera, DavidDe Andrés de Pablo, NuriaSchimmelpfennig, IreneTanarro García, Luis MiguelBrynjólfsson, SkaftiLópez-Acevedo, Francisco J.Sæmundsson, ÞorsteinnA.S.T.E.R. TeamIcelandDeglaciatioRock glaciersDebris-covered glaciers36Cl cosmic-ray exposure datingGeografía física2505.07 Geografía FísicaEighteen samples for 36Cl Cosmic-Ray Exposure (CRE) dating were taken from glacially polished bedrocks, moraine boulders, fossil/active rock glaciers and debris-covered glaciers in Fremri-Grjótárdalur and Hóladalur cirques in the Víðinesdalur, Hofsdalur and Héðinsdalur valleys, close to Hólar village, in the Tröllaskagi peninsula, northern Iceland. Boulder sampling was preceded by a study of the boulder stability with the twofold aim of: ensuring that the surfaces to be sampled were stable enough for the reliable application of CRE dating, and to better understand the relation between the glacier dynamics and exposition history. The results show that the glaciers which occupy the valleys in Tröllaskagi began their retreat around 16 ka. Later, the glaciers advanced again around 11 ka within the cirques, and small moraines were formed. Thereafter, these small glaciers retreated and evolved into rock glaciers as debris from paraglacial processes accumulated on the glacier surface. The fronts of these rock glaciers stabilized definitively shortly after their formation and became eventually fossil after the melting of their internal ice. New rock glaciers and debris-covered glaciers formed afterwards, which still have internal ice at present, although their current dynamics are mostly related to subsidence. The stabilization of these rock glaciers and debris-covered glaciers is dated to the period between 7 and 3 ka, although they may have been reactivated during cold neoglacial periods. This research demonstrates the potential interest in applying CRE dating methods to debris-covered glaciers and rock glaciers to determine their origin, evolution, and phase of cessation of internal movement until they finally lost their internal ice and became fossil.ElsevierUniversidad Complutense de Madrid20202020-01-0120202020-01-01journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/97069reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)InglésengMinisterio de Economía y Competitividad http://dx.doi.org/10.13039/501100003329 Not available CGL2015-65813-R EL CALENTAMIENTO DE LAS MONTAÑAS: GEOCRONOLOGIA Y EFECTOS AMBIENTALES DE LA DEGLACIACION DE LAS AREAS DE ALTA MONTAÑAopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/970692026-06-02T12:44:21Z
dc.title.none.fl_str_mv Constraints on the timing of debris-covered and rock glaciers: An exploratory case study in the Holar area, northern Iceland
title Constraints on the timing of debris-covered and rock glaciers: An exploratory case study in the Holar area, northern Iceland
spellingShingle Constraints on the timing of debris-covered and rock glaciers: An exploratory case study in the Holar area, northern Iceland
Fernández Fernández, José María
Iceland
Deglaciatio
Rock glaciers
Debris-covered glaciers
36Cl cosmic-ray exposure dating
Geografía física
2505.07 Geografía Física
title_short Constraints on the timing of debris-covered and rock glaciers: An exploratory case study in the Holar area, northern Iceland
title_full Constraints on the timing of debris-covered and rock glaciers: An exploratory case study in the Holar area, northern Iceland
title_fullStr Constraints on the timing of debris-covered and rock glaciers: An exploratory case study in the Holar area, northern Iceland
title_full_unstemmed Constraints on the timing of debris-covered and rock glaciers: An exploratory case study in the Holar area, northern Iceland
title_sort Constraints on the timing of debris-covered and rock glaciers: An exploratory case study in the Holar area, northern Iceland
dc.creator.none.fl_str_mv Fernández Fernández, José María
Palacios Estremera, David
De Andrés de Pablo, Nuria
Schimmelpfennig, Irene
Tanarro García, Luis Miguel
Brynjólfsson, Skafti
López-Acevedo, Francisco J.
Sæmundsson, Þorsteinn
A.S.T.E.R. Team
author Fernández Fernández, José María
author_facet Fernández Fernández, José María
Palacios Estremera, David
De Andrés de Pablo, Nuria
Schimmelpfennig, Irene
Tanarro García, Luis Miguel
Brynjólfsson, Skafti
López-Acevedo, Francisco J.
Sæmundsson, Þorsteinn
A.S.T.E.R. Team
author_role author
author2 Palacios Estremera, David
De Andrés de Pablo, Nuria
Schimmelpfennig, Irene
Tanarro García, Luis Miguel
Brynjólfsson, Skafti
López-Acevedo, Francisco J.
Sæmundsson, Þorsteinn
A.S.T.E.R. Team
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv Iceland
Deglaciatio
Rock glaciers
Debris-covered glaciers
36Cl cosmic-ray exposure dating
Geografía física
2505.07 Geografía Física
topic Iceland
Deglaciatio
Rock glaciers
Debris-covered glaciers
36Cl cosmic-ray exposure dating
Geografía física
2505.07 Geografía Física
description Eighteen samples for 36Cl Cosmic-Ray Exposure (CRE) dating were taken from glacially polished bedrocks, moraine boulders, fossil/active rock glaciers and debris-covered glaciers in Fremri-Grjótárdalur and Hóladalur cirques in the Víðinesdalur, Hofsdalur and Héðinsdalur valleys, close to Hólar village, in the Tröllaskagi peninsula, northern Iceland. Boulder sampling was preceded by a study of the boulder stability with the twofold aim of: ensuring that the surfaces to be sampled were stable enough for the reliable application of CRE dating, and to better understand the relation between the glacier dynamics and exposition history. The results show that the glaciers which occupy the valleys in Tröllaskagi began their retreat around 16 ka. Later, the glaciers advanced again around 11 ka within the cirques, and small moraines were formed. Thereafter, these small glaciers retreated and evolved into rock glaciers as debris from paraglacial processes accumulated on the glacier surface. The fronts of these rock glaciers stabilized definitively shortly after their formation and became eventually fossil after the melting of their internal ice. New rock glaciers and debris-covered glaciers formed afterwards, which still have internal ice at present, although their current dynamics are mostly related to subsidence. The stabilization of these rock glaciers and debris-covered glaciers is dated to the period between 7 and 3 ka, although they may have been reactivated during cold neoglacial periods. This research demonstrates the potential interest in applying CRE dating methods to debris-covered glaciers and rock glaciers to determine their origin, evolution, and phase of cessation of internal movement until they finally lost their internal ice and became fossil.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-01-01
2020
2020-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/97069
url https://hdl.handle.net/20.500.14352/97069
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Ministerio de Economía y Competitividad http://dx.doi.org/10.13039/501100003329 Not available CGL2015-65813-R EL CALENTAMIENTO DE LAS MONTAÑAS: GEOCRONOLOGIA Y EFECTOS AMBIENTALES DE LA DEGLACIACION DE LAS AREAS DE ALTA MONTAÑA
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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