Holocene Glaciation of the Arrigetch Peaks, Brooks Range, Alaska
1981; Arctic Institute of North America; Volume: 34; Issue: 2 Linguagem: Inglês
10.14430/arctic2517
ISSN1923-1245
AutoresJames Ellis, Thomas D. Hamilton, Parker E. Calkin,
Tópico(s)Lichen and fungal ecology
ResumoEleven cirque glaciers and associated deposits within the granitic Arrigetch Peaks of the west-central Brooks Range face north, minimizing insolation. Shading by surrounding mountainous terrain decreases insolation on these landforms even more significantly, favoring the formation of glacier-cored moraines. Comparison of glacier photographs taken in 1911, 1962, and 1979 reveals a record of decelerating recession. Geomorphic and lichenometric mapping suggests at least three to possibly eight phases of Holocene glacial expansion. These date between ~5000 and 300 yr B.P., based on the application of a central Brooks Range Rhizocarpon geographicum growth curve.
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