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Late Quaternary glaciation history of Isla de los Estados, southeasternmost South America

Möller, Per LU ; Hjort, Christian LU ; Björck, Svante LU ; Rabassa, Jorge and Federico Ponce, Juan (2010) In Quaternary Research 73(3). p.521-534
Abstract
Isla de los Estados is a mountainous island southeast of Tierra del Fuego, in southernmost South America. Its central and eastern parts have an alpine topography, transected by U-shaped valleys, small, partly over-deepened fjords, and a multitude of abandoned cirques, all associated with extensive former local glaciations. Traces of glacial erosion generally reach 400-450 m a.s.l., and above that trimline a distinct sharp-edged nunatak derived landscape is present. The westernmost part of the island has a lower, more subdued topography, reflecting its "softer" geology but possibly also over-running and erosion by mainland-derived ice streams. The present study concentrated on glacigenic sediment sequences exposed along coastal erosional... (More)
Isla de los Estados is a mountainous island southeast of Tierra del Fuego, in southernmost South America. Its central and eastern parts have an alpine topography, transected by U-shaped valleys, small, partly over-deepened fjords, and a multitude of abandoned cirques, all associated with extensive former local glaciations. Traces of glacial erosion generally reach 400-450 m a.s.l., and above that trimline a distinct sharp-edged nunatak derived landscape is present. The westernmost part of the island has a lower, more subdued topography, reflecting its "softer" geology but possibly also over-running and erosion by mainland-derived ice streams. The present study concentrated on glacigenic sediment sequences exposed along coastal erosional cliffs. A combination of OSL and C-14 datings show that these sediments mostly date from the latest (Wisconsinan/Weichselian) glacial cycle, i.e. from the last ca. 100 ka with the oldest (glaciolacustrine) deposits possibly as old as 90-80 ka. The upper parts of overlying tills, with associated lateral and terminal moraines from glaciers that expanded onto an eustatically exposed dry shelf north of the island, date from the last global glacial maximum (LGM). Radiocarbon ages of peat and lake sediments indicate that deglaciation began 17-16 cal ka BP. (C) 2010 University of Washington. Published by Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Tierra del Fuego, Isla de los Estados, South America, Glacial geology, Glacial chronology, Quaternary history, Glacial sedimentology
in
Quaternary Research
volume
73
issue
3
pages
521 - 534
publisher
Academic Press
external identifiers
  • wos:000277557200010
  • other:doi:10.1016/j.yqres.2010.02.004
  • scopus:77952289344
ISSN
0033-5894
DOI
10.1016/j.yqres.2010.02.004
project
MERGE
language
English
LU publication?
yes
id
37e5f53f-3e69-4624-8ca4-bdef1f1ffde2 (old id 1617681)
date added to LUP
2010-06-21 12:54:34
date last changed
2018-05-29 12:09:31
@article{37e5f53f-3e69-4624-8ca4-bdef1f1ffde2,
  abstract     = {Isla de los Estados is a mountainous island southeast of Tierra del Fuego, in southernmost South America. Its central and eastern parts have an alpine topography, transected by U-shaped valleys, small, partly over-deepened fjords, and a multitude of abandoned cirques, all associated with extensive former local glaciations. Traces of glacial erosion generally reach 400-450 m a.s.l., and above that trimline a distinct sharp-edged nunatak derived landscape is present. The westernmost part of the island has a lower, more subdued topography, reflecting its "softer" geology but possibly also over-running and erosion by mainland-derived ice streams. The present study concentrated on glacigenic sediment sequences exposed along coastal erosional cliffs. A combination of OSL and C-14 datings show that these sediments mostly date from the latest (Wisconsinan/Weichselian) glacial cycle, i.e. from the last ca. 100 ka with the oldest (glaciolacustrine) deposits possibly as old as 90-80 ka. The upper parts of overlying tills, with associated lateral and terminal moraines from glaciers that expanded onto an eustatically exposed dry shelf north of the island, date from the last global glacial maximum (LGM). Radiocarbon ages of peat and lake sediments indicate that deglaciation began 17-16 cal ka BP. (C) 2010 University of Washington. Published by Elsevier Inc. All rights reserved.},
  author       = {Möller, Per and Hjort, Christian and Björck, Svante and Rabassa, Jorge and Federico Ponce, Juan},
  issn         = {0033-5894},
  keyword      = {Tierra del Fuego,Isla de los Estados,South America,Glacial geology,Glacial chronology,Quaternary history,Glacial sedimentology},
  language     = {eng},
  number       = {3},
  pages        = {521--534},
  publisher    = {Academic Press},
  series       = {Quaternary Research},
  title        = {Late Quaternary glaciation history of Isla de los Estados, southeasternmost South America},
  url          = {http://dx.doi.org/10.1016/j.yqres.2010.02.004},
  volume       = {73},
  year         = {2010},
}