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Isolation and water-level fluctuations of Lake Kachishayoot, Northern Québec, Canada

Published online by Cambridge University Press:  20 January 2017

Luc Miousse
Affiliation:
Centre d'études nordiques and Département de géographie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4
Najat Bhiry*
Affiliation:
Centre d'études nordiques and Département de géographie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4
Martin Lavoie
Affiliation:
Centre d'études nordiques and Département de géographie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4
*
*Corresponding author. Email Address:najat.bhiry@cen.ulaval.ca

Abstract

This study combines different methods, including grain size, macrofossil, and pollen analyses, to reconstruct paleogeographical and paleoclimatological conditions for periods before, during, and after the isolation of a small lake (Lake Kachishayoot) in northern Québec. After the retreat of the Laurentide Ice Sheet around 8000 14C yr B.P., the area was submerged by the Tyrrell Sea. The transition from marine to lacustrine environment occurred about 5400 yr B.P. Two major periods of water-level fluctuations were inferred from organic and mineral sediments: a high water level that occurred after 3200 yr B.P. and a low water level that started before 2200 yr B.P. Our chronological data for the first period are consistent with those from nearby Lac des Pluviers and from other lakes in east central Canada and in the northeastern United States. During the low-water-level period, however, there is no evidence for minor fluctuations, whereas other lakes in northern Québec and east-central Canada underwent several brief lowerings. Long-term changes in atmospheric circulation caused by changing global boundary conditions likely explained long-term water-level fluctuations of Lake Kachishayoot.

Type
Research Article
Copyright
University of Washington

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