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(Article of periodic en Anglais - 1980)

Document title

Surge moraines of the Klutlan Glacier, Yukon Territory, Canada: origin, wastage, vegetation succession, lake development, and application to the Late-Glacial of Minnesota

Authors(s) and Affiliation(s)

WRIGHT H. E. Jr ;

Abstract

The Klutlan Glacier in the St. Elias Mountains of the Yukon Territory has surged repeatedly during the last few hundred years, and its drift-covered stagnant ice provides an analog for the downwastage, landform development, vegetational succession, and lake formation on Late Wisconsin moraines of Minnesota. Melting of the buried ice caused collapse of the drift mantle and the formation of lakes, which become filled with sediment that slumps im from receding ice walls. Topographic reversals are common, as the sediment cover of drained lakes inhibits local undermelting, and collapse occurs elsewhere. As the drift mantle thickens the land surface becomes stabilized, and pioneer herbs are succeeded by shrubs and then by white spruce. The oldest moraines (600-1200 yr old) have a multiple-generation spruce forest, yet melting of buried ice still locally forms young lakes. Cores of organic sediment from the oldest lakes contain a stratigraphic sequence of pollen, diatoms, and cladocerans that record the early stages in lake and landscape succession.

Source

Article of periodic

published at : Quaternary research New York

Editor :

Millesime : 1980, vol. 14, no1 [pp. 2-18]

Bibliographic references : 33 réf.

Language

Anglais

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