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

Author:
  • Per Möller
  • Christian Hjort
  • Svante Björck
  • Jorge Rabassa
  • Juan Federico Ponce
Publishing year: 2010
Language: English
Pages: 521-534
Publication/Series: Quaternary Research
Volume: 73
Issue: 3
Document type: Journal article
Publisher: Academic Press

Abstract english

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.

Keywords

  • Geology
  • Tierra del Fuego
  • Isla de los Estados
  • South America
  • Glacial geology
  • Glacial chronology
  • Quaternary history
  • Glacial sedimentology

Other

Published
  • ISSN: 0033-5894
  • doi:10.1016/j.yqres.2010.02.004
Per Möller
E-mail: per [dot] moller [at] geol [dot] lu [dot] se

Professor

Quaternary Sciences

+46 46 222 98 88

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