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dc.contributor.author
Menounos, Brian
dc.contributor.author
Clague, John J.
dc.contributor.author
Osborn, Gerald
dc.contributor.author
Thompson Davis, P.
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Ponce, Juan Federico
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Goehring, Brent
dc.contributor.author
Maurer, Malyssa
dc.contributor.author
Rabassa, Jorge Oscar
dc.contributor.author
Coronato, Andrea Maria Josefa
dc.contributor.author
Marr, Rob
dc.date.available
2017-10-17T18:27:33Z
dc.date.issued
2013-01
dc.identifier.citation
Menounos, Brian; Clague, John J.; Osborn, Gerald; Thompson Davis, P.; Ponce, Juan Federico; et al.; Latest Pleistocene and Holocene glacier fluctuations in southernmost Tierra del Fuego, Argentina; Elsevier; Quaternary Science Reviews; 77; 1-2013; 70-79
dc.identifier.issn
0277-3791
dc.identifier.uri
http://hdl.handle.net/11336/26740
dc.description.abstract
Some researchers propose that summer insolation controls long-term changes in glacier extent during the Holocene. If this hypothesis is correct, the record of glacier fluctuations at high latitudes in the Southern Hemisphere should differ from that in the Northern Hemisphere. Although the chronology of Holocene glacier fluctuations in the Northern Hemisphere is well established, much uncertainty remains in the ages of Holocene glacier fluctuations in the Southern Hemisphere, especially South America. Here we report on latest Pleistocene and Holocene glacier fluctuations at the southern end of the Andes north and west of Ushuaia, Argentina. Surface exposure ages (10Be) from glaciated bedrock beyond cirque moraines indicate that alpine areas were free of ice by ca 16.9 ka. One, and in some cases two, closely spaced moraines extend up to 2 km beyond Little Ice Age moraines within many of the cirques in the region. The mean age of five 10Be ages from two pre-Little Ice Age moraines is 14.27–12.67 ka, whereas a minimum limiting radiocarbon age for a smaller, recessional moraine in one cirque is 12.38–12.01 ka. Our ages imply that, following glacier retreat beginning about 18.52–17.17 ka, cirque glaciers first advanced during the Antarctic Cold Reversal (14.5–12.9 ka) and may have later advanced or stabilized in the Younger Dryas Chronozone (12.9–11.7 ka). Based on the distribution of thick, geochemically distinct, and well-dated Hudson tephra, no Holocene moraines appear to be older than 7.96–7.34 ka. At some sites, there is evidence for one or more advances of glaciers sometime between 7.96–7.34 ka and 5.29–5.05 ka to limits only tens of meters beyond Little Ice Age maximum positions. Taken together, the data: 1) do not support the summer insolation hypothesis to explain Holocene glacier fluctuations in southernmost Patagonia; 2) confirm paleobotanical evidence for a warm, dry early Holocene; and 3) suggest that some glaciers in the region reached extents comparable to those of the Little Ice Age shortly before 5.29–5.05 ka.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Late Pleistocene
dc.subject
Holocene
dc.subject
Cirques
dc.subject
Tierra del Fuego
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Glacier Fluctuations
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Patagonia
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Surface Exposure Dating
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Tephrochronology
dc.subject.classification
Oceanografía, Hidrología, Recursos Hídricos
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Latest Pleistocene and Holocene glacier fluctuations in southernmost Tierra del Fuego, Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2015-06-11T18:20:55Z
dc.journal.volume
77
dc.journal.pagination
70-79
dc.journal.pais
Países Bajos
dc.journal.ciudad
Ámsterdam
dc.description.fil
Fil: Menounos, Brian. University of Northern British Columbia; Canadá
dc.description.fil
Fil: Clague, John J.. University Fraser Simon; Canadá
dc.description.fil
Fil: Osborn, Gerald. University of Calgary; Canadá
dc.description.fil
Fil: Thompson Davis, P.. Bentley University; Estados Unidos
dc.description.fil
Fil: Ponce, Juan Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
dc.description.fil
Fil: Goehring, Brent. Purdue University; Estados Unidos
dc.description.fil
Fil: Maurer, Malyssa. University of Northern British Columbia; Canadá
dc.description.fil
Fil: Rabassa, Jorge Oscar. Consejo Nacional de Invest.cientif.y Tecnicas. Centro Austral de Investigaciones Cientificas; Argentina
dc.description.fil
Fil: Coronato, Andrea Maria Josefa. Consejo Nacional de Invest.cientif.y Tecnicas. Centro Austral de Investigaciones Cientificas; Argentina
dc.description.fil
Fil: Marr, Rob. University Fraser Simon; Canadá
dc.journal.title
Quaternary Science Reviews
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.quascirev.2013.07.008
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0277379113002667


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