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Deglacial environmental changes on Isla de los Estados (54.4 degrees S), southeastern Tierra del Fuego
GeoBiosphere Sci Ctr, SE-22362 Lund, Sweden..
GeoBiosphere Sci Ctr, SE-22362 Lund, Sweden..
Stockholm Univ, Dept Geol & Geochem, SE-10691 Stockholm, Sweden..
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2008 (English)In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 27, no 15-16, 1541-1554 p.Article in journal (Refereed) Published
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Abstract [en]

The island of Isla de los Estados is situated at 54.5 degrees S, 64 degrees W, east of Argentinian Tierra del Fuego, and is located in a sensitive geographic position in relation to the zonal circulation between Antarctica and South America. Its terrestrial records of the last deglaciation, recording atmospheric conditions but within an oceanic setting, can help to clarify changes of regional circulation patterns, both atmospheric and marine. Here, we present geochemical analyses from 16-10 ka cal BP of a peat core from Lago Galvarne Bog at the northern coast of the island, and a lake sediment core from Laguna Cascada 3 kin further south. The data comprise TC, TN, loss on ignition analyses and continuous XRF scanning on both cores as well as age-depth modeling based on AMS-C-14 dating. Deglaciation and onset of peat formation in the coastal areas began before 16 ka cal BP followed by a rapid glacial retreat and the start of lacustrine sedimentation further inland. Data Suggest initially windy conditions with permafrost succeeded by gradually warmer and wetter conditions until ca 14.5 ka cal BP. The warming trend slows down until ca 13.5 ka cal BP, followed by arid conditions culminating around 12.8 ka cal BP. Our data suggest fairly warm conditions and the establishment of denser peat and forest vegetation ca 10.6 ka cal BP, contemporaneous with the onset of the Antarctic thermal optimum. This indicates large-scale shifts in the placement of zonal flow and the Westerlies at the beginning of the Holocene. (C) 2008 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2008. Vol. 27, no 15-16, 1541-1554 p.
Research subject
SWEDARP 2005/06, Isla de los Estados
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URN: urn:nbn:se:polar:diva-2631DOI: 10.1016/j.quascirev.2008.05.004ISI: 000259017900006OAI: oai:DiVA.org:polar-2631DiVA: diva2:894158
Available from: 2016-01-14 Created: 2016-01-14 Last updated: 2016-01-14

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