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Late Quaternary Glacial and Environmental History of the Burstall Pass Area, Kananaskis Country, Alberta, Canada
Brandon D. Beierle, Derald G. Smith and Leonard V. Hills
Arctic, Antarctic, and Alpine Research
Vol. 35, No. 3 (Aug., 2003), pp. 391-398
Published by: INSTAAR, University of Colorado
Stable URL: http://www.jstor.org/stable/1552575
Page Count: 8
You can always find the topics here!Topics: Glacial lakes, Moraines, Pollen, Radiocarbon, Sediments, Tephra, Paleoclimatology, Glaciers, Marl, Lake sediment cores
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We used integrated multiproxy analysis of a lake sediment core and glacial geomorphology to reconstruct the late Pleistocene and Holocene climate and geomorphic evolution of the Burstall Pass area, Kananaskis Country, Alberta, Canada. Analysis of macrofossils, pollen, sedimentology, and sediment geochemistry from a lake sediment core and geomorphology and tephrochronology of glacial moraines provide evidence for multiple modes of climate during the last ca. 11,000 yr. An advance of the Robertson Glacier prior to ca. 9200 14C BP is correlated to the Crowfoot advance and was the largest of the postglacial period. Immediately following this event, increased lake productivity and the deposition of marl as well as increased arboreal/nonarboreal pollen (AP/NAP) ratios suggest that the climate warmed, possibly accompanied by increased aridity. Decreased turbidity and clastic sediment flux in Lower Burstall Lake during the early Holocene suggest reduced glacial runoff and may indicate the complete ablation of the Robertson Glacier shortly after 10,000 14C BP. Clastic sediment flux to Lower Burstall Lake remained minimal until after ca. 3500 14C BP, when decreasing LOI (loss-on-ignition) organic carbon levels in lake sediments signaled the return of glacial runoff to the lake system. The largest Neoglacial advance in the Burstall Pass area appears to have been the most recent and was followed by rapid recession during the 20th century.
Arctic, Antarctic, and Alpine Research © 2003 Regents of the University of Colorado, a body corporate, contracting on behalf of the University of Colorado at Boulder for the benefit of INSTAAR