Holocene Glaciation of the Arrigetch Peaks, Brooks Range, Alaska

Abstract

ABSTRACT. Eleven 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 significant- ly, favoring the formation of glacier-cored moraines. Comparison of glacier photographs taken in 191 1, 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 geographicurn growth curve.