Surface exposure dating of moraines and alluvial fans in the Southern Central Andes

Autores
Terrizzano, Carla Marina; Zech, Roland; Garcia Morabito, Ezequiel; Haghipour, Negar; Christl, Marcus; Likerman, Jeremias; Tobal, Jonathan Elías; Yamin, Marcela Gladys
Año de publicación
2016
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The role of tectonics versus climate in controlling the evolution of alluvial fans in discussed controversially. The southern Central Andes and their forelands provide a perfect setting to study climate versus tectonic control of alluvial fans. On the one hand, the region is tectonically active and alluvial fan surfaces are offset by faults. The higher summits, on the other hand, are glaciated today, and glacial deposits document past periods of lower temperatures and increased precipitation. We applied 10Be surface exposure dating on 5 fan terraces 4 moraines of the Ansilta range (31.6°S - 69.8°W) using boulder sand amalgamated pebbles to explore their chronological relationship.From youngest to oldest, the alluvial fan terraces yield minimum ages of 15 ± 1 ka (T1), 97 ± 9 ka (T2), 141 ± 9 ka (T3), 286 ± 14 ka(T4) and 570 ± 57 ka (T5). Minimum ages derived from moraines are 14± 1 ka (M1), 22 ± 2 ka (M2), 157 ± 14 ka (M3) and 351 ± 33 ka(M4), all calculations assuming no erosion and using the scaling scheme for spallation based on Lal 1991, Stone 2000. The moraines document glacial advances during cold periods at the marine isotope stages (MIS) 2, 6 and 10. The terraces T1, T3 seem to be geomorphologic counterparts during MIS 2 and 6. We suggest that T2,T4 and T5 document aggradation during the cold periods MIS 5d, 8 and14 in response to glacial advances, although the respective moraines are not preserved.Our results highlight: i) the arid climate in the Southern Central Andes favors the preservation of glacial and alluvial deposits allowing landscape and climate reconstructions back to ~570 ka), ii) alluvial deposits correlate with moraines or fall into cold glacial times, so that climate, and in particular the existence of glaciers, seems to be the main forcing of alluvial fan formation at our study site.
Fil: Terrizzano, Carla Marina. University of Bern; Suiza
Fil: Zech, Roland. University of Bern; Suiza
Fil: Garcia Morabito, Ezequiel. Swiss Federal Institute of Technology Zurich; Suiza
Fil: Haghipour, Negar. Swiss Federal Institute of Technology Zurich; Suiza
Fil: Christl, Marcus. Swiss Federal Institute of Technology Zurich; Suiza
Fil: Likerman, Jeremias. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Tobal, Jonathan Elías. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Yamin, Marcela Gladys. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
EGU General Assembly 2016
Viena
Austria
European Geosciences Union
Materia
Moraines
Surface exposure dating
Southern Central Andes
Ansilta
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/277298
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/277298
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Surface exposure dating of moraines and alluvial fans in the Southern Central AndesTerrizzano, Carla MarinaZech, RolandGarcia Morabito, EzequielHaghipour, NegarChristl, MarcusLikerman, JeremiasTobal, Jonathan ElíasYamin, Marcela GladysMorainesSurface exposure datingSouthern Central AndesAnsiltahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The role of tectonics versus climate in controlling the evolution of alluvial fans in discussed controversially. The southern Central Andes and their forelands provide a perfect setting to study climate versus tectonic control of alluvial fans. On the one hand, the region is tectonically active and alluvial fan surfaces are offset by faults. The higher summits, on the other hand, are glaciated today, and glacial deposits document past periods of lower temperatures and increased precipitation. We applied 10Be surface exposure dating on 5 fan terraces 4 moraines of the Ansilta range (31.6°S - 69.8°W) using boulder sand amalgamated pebbles to explore their chronological relationship.From youngest to oldest, the alluvial fan terraces yield minimum ages of 15 ± 1 ka (T1), 97 ± 9 ka (T2), 141 ± 9 ka (T3), 286 ± 14 ka(T4) and 570 ± 57 ka (T5). Minimum ages derived from moraines are 14± 1 ka (M1), 22 ± 2 ka (M2), 157 ± 14 ka (M3) and 351 ± 33 ka(M4), all calculations assuming no erosion and using the scaling scheme for spallation based on Lal 1991, Stone 2000. The moraines document glacial advances during cold periods at the marine isotope stages (MIS) 2, 6 and 10. The terraces T1, T3 seem to be geomorphologic counterparts during MIS 2 and 6. We suggest that T2,T4 and T5 document aggradation during the cold periods MIS 5d, 8 and14 in response to glacial advances, although the respective moraines are not preserved.Our results highlight: i) the arid climate in the Southern Central Andes favors the preservation of glacial and alluvial deposits allowing landscape and climate reconstructions back to ~570 ka), ii) alluvial deposits correlate with moraines or fall into cold glacial times, so that climate, and in particular the existence of glaciers, seems to be the main forcing of alluvial fan formation at our study site.Fil: Terrizzano, Carla Marina. University of Bern; SuizaFil: Zech, Roland. University of Bern; SuizaFil: Garcia Morabito, Ezequiel. Swiss Federal Institute of Technology Zurich; SuizaFil: Haghipour, Negar. Swiss Federal Institute of Technology Zurich; SuizaFil: Christl, Marcus. Swiss Federal Institute of Technology Zurich; SuizaFil: Likerman, Jeremias. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Tobal, Jonathan Elías. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Yamin, Marcela Gladys. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; ArgentinaEGU General Assembly 2016VienaAustriaEuropean Geosciences UnionCopernicus Publications2016info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/277298Surface exposure dating of moraines and alluvial fans in the Southern Central Andes; EGU General Assembly 2016; Viena; Austria; 2016; 1-1CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.geophysical-research-abstracts.net/egu2016.htmlinfo:eu-repo/semantics/altIdentifier/url/https://www.egu2016.eu/Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-01-08T13:08:12Zoai:ri.conicet.gov.ar:11336/277298instacron: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:34982026-01-08 13:08:13.23CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Surface exposure dating of moraines and alluvial fans in the Southern Central Andes
title Surface exposure dating of moraines and alluvial fans in the Southern Central Andes
spellingShingle Surface exposure dating of moraines and alluvial fans in the Southern Central Andes
Terrizzano, Carla Marina
Moraines
Surface exposure dating
Southern Central Andes
Ansilta
title_short Surface exposure dating of moraines and alluvial fans in the Southern Central Andes
title_full Surface exposure dating of moraines and alluvial fans in the Southern Central Andes
title_fullStr Surface exposure dating of moraines and alluvial fans in the Southern Central Andes
title_full_unstemmed Surface exposure dating of moraines and alluvial fans in the Southern Central Andes
title_sort Surface exposure dating of moraines and alluvial fans in the Southern Central Andes
dc.creator.none.fl_str_mv Terrizzano, Carla Marina
Zech, Roland
Garcia Morabito, Ezequiel
Haghipour, Negar
Christl, Marcus
Likerman, Jeremias
Tobal, Jonathan Elías
Yamin, Marcela Gladys
author Terrizzano, Carla Marina
author_facet Terrizzano, Carla Marina
Zech, Roland
Garcia Morabito, Ezequiel
Haghipour, Negar
Christl, Marcus
Likerman, Jeremias
Tobal, Jonathan Elías
Yamin, Marcela Gladys
author_role author
author2 Zech, Roland
Garcia Morabito, Ezequiel
Haghipour, Negar
Christl, Marcus
Likerman, Jeremias
Tobal, Jonathan Elías
Yamin, Marcela Gladys
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Moraines
Surface exposure dating
Southern Central Andes
Ansilta
topic Moraines
Surface exposure dating
Southern Central Andes
Ansilta
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The role of tectonics versus climate in controlling the evolution of alluvial fans in discussed controversially. The southern Central Andes and their forelands provide a perfect setting to study climate versus tectonic control of alluvial fans. On the one hand, the region is tectonically active and alluvial fan surfaces are offset by faults. The higher summits, on the other hand, are glaciated today, and glacial deposits document past periods of lower temperatures and increased precipitation. We applied 10Be surface exposure dating on 5 fan terraces 4 moraines of the Ansilta range (31.6°S - 69.8°W) using boulder sand amalgamated pebbles to explore their chronological relationship.From youngest to oldest, the alluvial fan terraces yield minimum ages of 15 ± 1 ka (T1), 97 ± 9 ka (T2), 141 ± 9 ka (T3), 286 ± 14 ka(T4) and 570 ± 57 ka (T5). Minimum ages derived from moraines are 14± 1 ka (M1), 22 ± 2 ka (M2), 157 ± 14 ka (M3) and 351 ± 33 ka(M4), all calculations assuming no erosion and using the scaling scheme for spallation based on Lal 1991, Stone 2000. The moraines document glacial advances during cold periods at the marine isotope stages (MIS) 2, 6 and 10. The terraces T1, T3 seem to be geomorphologic counterparts during MIS 2 and 6. We suggest that T2,T4 and T5 document aggradation during the cold periods MIS 5d, 8 and14 in response to glacial advances, although the respective moraines are not preserved.Our results highlight: i) the arid climate in the Southern Central Andes favors the preservation of glacial and alluvial deposits allowing landscape and climate reconstructions back to ~570 ka), ii) alluvial deposits correlate with moraines or fall into cold glacial times, so that climate, and in particular the existence of glaciers, seems to be the main forcing of alluvial fan formation at our study site.
Fil: Terrizzano, Carla Marina. University of Bern; Suiza
Fil: Zech, Roland. University of Bern; Suiza
Fil: Garcia Morabito, Ezequiel. Swiss Federal Institute of Technology Zurich; Suiza
Fil: Haghipour, Negar. Swiss Federal Institute of Technology Zurich; Suiza
Fil: Christl, Marcus. Swiss Federal Institute of Technology Zurich; Suiza
Fil: Likerman, Jeremias. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Tobal, Jonathan Elías. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Yamin, Marcela Gladys. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
EGU General Assembly 2016
Viena
Austria
European Geosciences Union
description The role of tectonics versus climate in controlling the evolution of alluvial fans in discussed controversially. The southern Central Andes and their forelands provide a perfect setting to study climate versus tectonic control of alluvial fans. On the one hand, the region is tectonically active and alluvial fan surfaces are offset by faults. The higher summits, on the other hand, are glaciated today, and glacial deposits document past periods of lower temperatures and increased precipitation. We applied 10Be surface exposure dating on 5 fan terraces 4 moraines of the Ansilta range (31.6°S - 69.8°W) using boulder sand amalgamated pebbles to explore their chronological relationship.From youngest to oldest, the alluvial fan terraces yield minimum ages of 15 ± 1 ka (T1), 97 ± 9 ka (T2), 141 ± 9 ka (T3), 286 ± 14 ka(T4) and 570 ± 57 ka (T5). Minimum ages derived from moraines are 14± 1 ka (M1), 22 ± 2 ka (M2), 157 ± 14 ka (M3) and 351 ± 33 ka(M4), all calculations assuming no erosion and using the scaling scheme for spallation based on Lal 1991, Stone 2000. The moraines document glacial advances during cold periods at the marine isotope stages (MIS) 2, 6 and 10. The terraces T1, T3 seem to be geomorphologic counterparts during MIS 2 and 6. We suggest that T2,T4 and T5 document aggradation during the cold periods MIS 5d, 8 and14 in response to glacial advances, although the respective moraines are not preserved.Our results highlight: i) the arid climate in the Southern Central Andes favors the preservation of glacial and alluvial deposits allowing landscape and climate reconstructions back to ~570 ka), ii) alluvial deposits correlate with moraines or fall into cold glacial times, so that climate, and in particular the existence of glaciers, seems to be the main forcing of alluvial fan formation at our study site.
publishDate 2016
dc.date.none.fl_str_mv 2016
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Reunión
Journal
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/277298
Surface exposure dating of moraines and alluvial fans in the Southern Central Andes; EGU General Assembly 2016; Viena; Austria; 2016; 1-1
CONICET Digital
CONICET
url http://hdl.handle.net/11336/277298
identifier_str_mv Surface exposure dating of moraines and alluvial fans in the Southern Central Andes; EGU General Assembly 2016; Viena; Austria; 2016; 1-1
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.geophysical-research-abstracts.net/egu2016.html
info:eu-repo/semantics/altIdentifier/url/https://www.egu2016.eu/
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Copernicus Publications
publisher.none.fl_str_mv Copernicus Publications
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 12.747614

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