CGRG Bibliography of Canadian Geomorphology
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Author : Desloges, J.R.; and Gilbert, R.
Date : 2005.
Title : The record of Glacial Lake Champagne in Kusawa Lake, southwestern Yukon Territory.
Publication : Annual Meeting of the Canadian Association of Geographer. Tuesday, May 31 to Saturday, to June 4, 2005. University of Western Ontario, London, Ontario.
Issue :
Page(s) :
Abstract
Late Pleistocene glaciers dammed Glacial Lake Champagne in the valley of Dezadeash River between a westward flowing glacier in the Takhini Valley and glaciers from the St. Elias complex. Modern Kusawa Lake lies in a major southern extension of Glacial Lake Champagne. Geophysical and geomorphic evidence document the deglaciation of the lake, the presence of Lake Champagne and the post-glacial sedimentary environment of the basin. At the maximum extent of Lake Champagne the water level stood at 772 m in the northern part of Kusawa Lake and 756 m in the Dezadeash valley, both probably controlled by a spillway floored at 756 m to the north. This indicates differential isostatic rebound of 0.2 m/km from south to north. Levels fell to 744 m, 714 m and finally to 671 m with each episode depositing a specific sequence of sediment in the basin. By the time Kusawa Lake was lowered to its present level of 671 m, glaciers had retreated from the southern portion of the lake where a single sedimentary facies documents continuous glacilacustrine deposition from sediment originating in tributary basins still containing 11 – 14% glacier cover.
Bibliography of Canadian Geomorphology