+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Latest Pleistocene and Holocene glacier fluctuations in southernmost Tierra del Fuego, Argentina



Latest Pleistocene and Holocene glacier fluctuations in southernmost Tierra del Fuego, Argentina



Quaternary Science Reviews 77: 70-79



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 caA 16.9A ka. One, and in some cases two, closely spaced moraines extend up to 2A 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 14.27a 12.67A ka, whereas a minimum limiting radiocarbon age for a smaller, recessional moraine in one cirque is 12.38a 12.01A ka. Our ages imply that, following glacier retreat beginning about 18.52a 17.17A ka, cirque glaciers first advanced during the Antarctic Cold Reversal (14.5a 12.9A ka) and may have later advanced or stabilized in the Younger Dryas Chronozone (12.9a 11.7A ka). Based on the distribution of thick, geochemically distinct, and well-dated Hudson tephra, no Holocene moraines appear to be older than 7.96a 7.34A ka. At some sites, there is evidence for one or more advances of glaciers sometime between 7.96a 7.34A ka and 5.29a 5.05A 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 5.29a 5.05A ka.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 037437835

Download citation: RISBibTeXText

DOI: 10.1016/j.quascirev.2013.07.008


Related references

Latest Pleistocene and Holocene glacier fluctuations in southernmost Tierra del Fuego, Argentina. Quaternary Science Reviews 77: 70-79, 2013

Latest Pleistocene and Holocene glacier fluctuations in southernmost Patagonia. American Geophysical Union Fall Meeting, 2011

Terrestrial and lacustrine evidence of Holocene glacier activity in Tierra del Fuego southernmost South America. Bollettino di Geofisica Teorica ed Applicata 51, 2010

Biostratigraphy based on dinoflagellate cysts from the Cabo Pena Formation Latest Eocene-Early Oligocene, Tierra del Fuego, Argentina Bioestratigrafia basada en quistes de dinoflagelados de la formacion Cabo Pena Eoceno Terminal-Oligoceno Temprano, Tierra del Fuego, Argentina. Revista Espanola de Micropaleontologia. Enero-Abril; 341: 105-116, 2002

Taphonomic analysis of Holocene chitons (Polyplacophora : Mollusca) from Tierra del Fuego, Argentina FT Analisis tafonomico de quitones (Polyplacophora: mollusca) holocenos de tierra del fuego, Argentina. 2007

Latest Pleistocene and Holocene alpine glacier fluctuations in Scandinavia. Quaternary Science Reviews 28(21-22): 0-2136, 2009

Holocene and latest Pleistocene glacier fluctuations in Western Canada. Geological Society of America 42.5, 2010

Latest Pleistocene and Holocene glacier fluctuations in western Canada. Quaternary Science Reviews 28(21-22): 0-2074, 2009

Latest Pleistocene and Holocene glacier fluctuations in the Himalaya and Tibet. Quaternary Science Reviews 28(21-22): 0-2164, 2009

Holocene and latest Pleistocene fluctuations of Stutfield Glacier, Canadian Rockies. Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre 38(8): 1141-1155, 2001

Latest Pleistocene and Holocene glacier fluctuations at Mount Rainier, Washington. Geological Society of America 41.7, 2009

Latest Pleistocene and Holocene glacier fluctuations on Mount Baker, Washington. Quaternary Science Reviews 49(none), 2012

Wedge structures in southernmost Argentina (Rio Grande, Tierra del Fuego). International Conference on Permafrost (ICOP) Proceedings 9: 1381-1385, 2008

Microplancton fosil de sedimentos terciarios y cretacicos del norte de Tierra del Fuego (Argentina); fossil microplankton of Tertiary and Cretaceous sediments from the northern Tierra del Fuego (Argentina). Ameghiniana 4(1): 7-15, 1965

Record of Paleogene radiolarians from Tierra del Fuego Island, Argentina Hallazgo de radiolarios del Paleogeno en la Isla Grande de Tierra del Fuego, Argentina. Ameghiniana 383: 317-320, 2001