Cosmogenic nuclide measurements in southernmost South America and implications for landscape change

Autores
Kaplan, M.R.; Coronato, Andrea Maria Josefa; Hulton, N.R.J.; Rabassa, Jorge Oscar; Kubik, P.W.; Freeman, S.P.H.T.
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We measured in situ 10Be, 26Al and 36Cl on glacial deposits as old as 1.1 Myr in the southernmost part of Patagonia and on northern Tierra del Fuego to understand boulder and moraine and, by inference, landscape changes. Nuclide concentrations indicate that surface boulders have been exposed for far less time than the ages of moraines they sit upon. The moraine ages are themselves constrained by previously obtained 40Ar/39Ar ages on interbedded lava flows or U-series and amino acid measurements on related (non-glacial) marine deposits. We suggest that a combination of boulder erosion and their exhumation from the moraine matrix could cause the erratics to have a large age variance and often short exposure histories, despite the fact that some moraine landforms are demonstrably 1 Myr old. We hypothesize that fast or episodic rates of landscape change occurred during glacial times or near the sea during interglacials. Comparison with boulder erosion rates and exhumation histories derived for the middle latitudes of semi-arid Patagonia imply different geomorphic processes operating in southernmost South America. We infer a faster rate of landscape degradation towards the higher latitudes where conditions have been colder and wetter.
Fil: Kaplan, M.R.. University of Edinburgh; Reino Unido
Fil: Coronato, Andrea Maria Josefa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Hulton, N.R.J.. University of Edinburgh; Reino Unido
Fil: Rabassa, Jorge Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Kubik, P.W.. Universitat Zurich; Suiza
Fil: Freeman, S.P.H.T.. Scottish Universities Environmental Research Centre; Reino Unido
Materia
ARGENTINA
COSMOGENIC
GEOMORPHOLOGY
GLACIAL GEOLOGY
QUATERNARY
SOUTH AMERICA
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/151226
Acceder
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Cosmogenic nuclide measurements in southernmost South America and implications for landscape changeKaplan, M.R.Coronato, Andrea Maria JosefaHulton, N.R.J.Rabassa, Jorge OscarKubik, P.W.Freeman, S.P.H.T.ARGENTINACOSMOGENICGEOMORPHOLOGYGLACIAL GEOLOGYQUATERNARYSOUTH AMERICAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1We measured in situ 10Be, 26Al and 36Cl on glacial deposits as old as 1.1 Myr in the southernmost part of Patagonia and on northern Tierra del Fuego to understand boulder and moraine and, by inference, landscape changes. Nuclide concentrations indicate that surface boulders have been exposed for far less time than the ages of moraines they sit upon. The moraine ages are themselves constrained by previously obtained 40Ar/39Ar ages on interbedded lava flows or U-series and amino acid measurements on related (non-glacial) marine deposits. We suggest that a combination of boulder erosion and their exhumation from the moraine matrix could cause the erratics to have a large age variance and often short exposure histories, despite the fact that some moraine landforms are demonstrably 1 Myr old. We hypothesize that fast or episodic rates of landscape change occurred during glacial times or near the sea during interglacials. Comparison with boulder erosion rates and exhumation histories derived for the middle latitudes of semi-arid Patagonia imply different geomorphic processes operating in southernmost South America. We infer a faster rate of landscape degradation towards the higher latitudes where conditions have been colder and wetter.Fil: Kaplan, M.R.. University of Edinburgh; Reino UnidoFil: Coronato, Andrea Maria Josefa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Hulton, N.R.J.. University of Edinburgh; Reino UnidoFil: Rabassa, Jorge Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Kubik, P.W.. Universitat Zurich; SuizaFil: Freeman, S.P.H.T.. Scottish Universities Environmental Research Centre; Reino UnidoElsevier Science2007-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/151226Kaplan, M.R.; Coronato, Andrea Maria Josefa; Hulton, N.R.J.; Rabassa, Jorge Oscar; Kubik, P.W.; et al.; Cosmogenic nuclide measurements in southernmost South America and implications for landscape change; Elsevier Science; Geomorphology; 87; 4; 7-2007; 284-3010169-555XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169555X0600448X?via%3Dihubinfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.geomorph.2006.10.005info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:02:07Zoai:ri.conicet.gov.ar:11336/151226instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:02:07.283CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Cosmogenic nuclide measurements in southernmost South America and implications for landscape change
title Cosmogenic nuclide measurements in southernmost South America and implications for landscape change
spellingShingle Cosmogenic nuclide measurements in southernmost South America and implications for landscape change
Kaplan, M.R.
ARGENTINA
COSMOGENIC
GEOMORPHOLOGY
GLACIAL GEOLOGY
QUATERNARY
SOUTH AMERICA
title_short Cosmogenic nuclide measurements in southernmost South America and implications for landscape change
title_full Cosmogenic nuclide measurements in southernmost South America and implications for landscape change
title_fullStr Cosmogenic nuclide measurements in southernmost South America and implications for landscape change
title_full_unstemmed Cosmogenic nuclide measurements in southernmost South America and implications for landscape change
title_sort Cosmogenic nuclide measurements in southernmost South America and implications for landscape change
dc.creator.none.fl_str_mv Kaplan, M.R.
Coronato, Andrea Maria Josefa
Hulton, N.R.J.
Rabassa, Jorge Oscar
Kubik, P.W.
Freeman, S.P.H.T.
author Kaplan, M.R.
author_facet Kaplan, M.R.
Coronato, Andrea Maria Josefa
Hulton, N.R.J.
Rabassa, Jorge Oscar
Kubik, P.W.
Freeman, S.P.H.T.
author_role author
author2 Coronato, Andrea Maria Josefa
Hulton, N.R.J.
Rabassa, Jorge Oscar
Kubik, P.W.
Freeman, S.P.H.T.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv ARGENTINA
COSMOGENIC
GEOMORPHOLOGY
GLACIAL GEOLOGY
QUATERNARY
SOUTH AMERICA
topic ARGENTINA
COSMOGENIC
GEOMORPHOLOGY
GLACIAL GEOLOGY
QUATERNARY
SOUTH AMERICA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We measured in situ 10Be, 26Al and 36Cl on glacial deposits as old as 1.1 Myr in the southernmost part of Patagonia and on northern Tierra del Fuego to understand boulder and moraine and, by inference, landscape changes. Nuclide concentrations indicate that surface boulders have been exposed for far less time than the ages of moraines they sit upon. The moraine ages are themselves constrained by previously obtained 40Ar/39Ar ages on interbedded lava flows or U-series and amino acid measurements on related (non-glacial) marine deposits. We suggest that a combination of boulder erosion and their exhumation from the moraine matrix could cause the erratics to have a large age variance and often short exposure histories, despite the fact that some moraine landforms are demonstrably 1 Myr old. We hypothesize that fast or episodic rates of landscape change occurred during glacial times or near the sea during interglacials. Comparison with boulder erosion rates and exhumation histories derived for the middle latitudes of semi-arid Patagonia imply different geomorphic processes operating in southernmost South America. We infer a faster rate of landscape degradation towards the higher latitudes where conditions have been colder and wetter.
Fil: Kaplan, M.R.. University of Edinburgh; Reino Unido
Fil: Coronato, Andrea Maria Josefa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Hulton, N.R.J.. University of Edinburgh; Reino Unido
Fil: Rabassa, Jorge Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Kubik, P.W.. Universitat Zurich; Suiza
Fil: Freeman, S.P.H.T.. Scottish Universities Environmental Research Centre; Reino Unido
description We measured in situ 10Be, 26Al and 36Cl on glacial deposits as old as 1.1 Myr in the southernmost part of Patagonia and on northern Tierra del Fuego to understand boulder and moraine and, by inference, landscape changes. Nuclide concentrations indicate that surface boulders have been exposed for far less time than the ages of moraines they sit upon. The moraine ages are themselves constrained by previously obtained 40Ar/39Ar ages on interbedded lava flows or U-series and amino acid measurements on related (non-glacial) marine deposits. We suggest that a combination of boulder erosion and their exhumation from the moraine matrix could cause the erratics to have a large age variance and often short exposure histories, despite the fact that some moraine landforms are demonstrably 1 Myr old. We hypothesize that fast or episodic rates of landscape change occurred during glacial times or near the sea during interglacials. Comparison with boulder erosion rates and exhumation histories derived for the middle latitudes of semi-arid Patagonia imply different geomorphic processes operating in southernmost South America. We infer a faster rate of landscape degradation towards the higher latitudes where conditions have been colder and wetter.
publishDate 2007
dc.date.none.fl_str_mv 2007-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/151226
Kaplan, M.R.; Coronato, Andrea Maria Josefa; Hulton, N.R.J.; Rabassa, Jorge Oscar; Kubik, P.W.; et al.; Cosmogenic nuclide measurements in southernmost South America and implications for landscape change; Elsevier Science; Geomorphology; 87; 4; 7-2007; 284-301
0169-555X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/151226
identifier_str_mv Kaplan, M.R.; Coronato, Andrea Maria Josefa; Hulton, N.R.J.; Rabassa, Jorge Oscar; Kubik, P.W.; et al.; Cosmogenic nuclide measurements in southernmost South America and implications for landscape change; Elsevier Science; Geomorphology; 87; 4; 7-2007; 284-301
0169-555X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169555X0600448X?via%3Dihub
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geomorph.2006.10.005
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.993085

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