CGRG Bibliography of Canadian Geomorphology
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Author : Dirszowsky, R.; and Ziten, C.
Date : 2004.
Title : A comparison of Little Ice Age lake sediment and dendrochronological records from the Mount Robson area of British Columbia.
Publication : International Conference on Sediment and Geochemical Budgets in Geomorphology to honour Professor Olav Slaymaker. June 27th - 30th, 2004 The University of British Columbia, Vancouver, Canada.
Issue :
Page(s) :
Abstract
This study assesses lake sediment and geochemical records and moraine chronologies in the upper Fraser River watershed, British Columbia, in order to resolve differences in interpretation and clarify sediment production and sediment delivery processes. Moose Lake (15.3 km2; 1032 m a.s.l.) contains a partially varved record indicating variable but relatively constant rates of accumulation during the last millennium, despite the known occurrence of significant Little Ice Age glacial advances in the region. Forefield deposits in the headwaters of the basin (Reef Icefield) indicate that outlet glaciers recently extended up to 1.9 km down-valley from their current positions. Dendrochronological dating of these surfaces shows that phases of moraine construction occurred just prior to ca. 1789 A.D., 1865 A.D., 1879 A.D. and 1902 A.D. While not reflected in the lacustrine accumulation rates, increased sediment production attributable to glacial activity is evident in the composition of these sediments. Variations in Ca and related elements derived from glaciated carbonate terrain within the Moose River sub-basin (including Reef Icefield) indicate gradually increasing delivery from these sources from the 12th though 20th centuries. Peak yields occurring ca. 1200 A.D., 1500 A.D., 1750 A.D. and 1900 A.D. include those implied by the moraine record.
Bibliography of Canadian Geomorphology