FIG. 1. Location map of northern Alaska.

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 glac...

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Bibliographic Details
Main Authors: James M. Ellis, Thomas D. Hamiltonz, Parker E. Calkin
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Arctic
Brooks Range
glacier
glaciers
Alaska
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.490.7180
http://pubs.aina.ucalgary.ca/arctic/arctic34-2-158.pdf
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Summary: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. RfiSUMfi. Dans les hauts plateaux granitique Arrigetch situes dans la partie centre-ouest de la chaine Brooks, on retrouve onze cirques glaciers et leur depots orientes vers le nord, minimisant ainsi l'ensoleillement. L'ombre produite par les terrains montagneux limitrophe diminue cet ensoleillement de façon encore plus marquee favorisant ainsi le ddveloppement de moraines faites d'un noyau de glace. Une comparaison des photographies du glacier en 191 1,1962 et 1979 montre un ralentissement de son recul. La cartographie gtomorphique et lichenometrique suggbre au moins trois et possiblement jusqu'h huit phases d'expansion glaciaire lors de 1'Holocbne. En considkrant la courbe de croissance de Rhizocarpon geographicurn dans la partie centrale de la chaine Brooks, ces expansion datent d'entre- 5000 et 300 ans A.A.

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