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Fabric and texture at Siple Dome, Antarctica

January 1, 2005

Preferred c-axis orientations are present in the firn at Siple Dome, West Antarctica, and recrystallization begins as shallow as 200 m depth in ice below –20°C, based on digital analysis of c-axis fabrics, grain-sizes and other characteristics of 52 vertical thin sections prepared in the field from the kilometer-long Siple Dome ice core. The shallowest section analyzed, from 22 m, shows clustering of c axes toward the vertical. By 200 m depth, girdle fabric and other features of recrystallized ice are evident in layers (or regions), separated by layers (regions) of typically finer-grained ice lacking evidence of recrystallization. Ice from about 700–780m depth, which was deposited during the last ice age, is especially fine-grained, with strongly vertical c axes, but deeper ice shows much larger crystals and strong evidence of recrystallization. Azimuthal asymmetry of some c-axis fabrics, trends in grain-size, and other indicators reveal additional information on processes and history of ice flow at Siple Dome.

Citation Information

Publication Year 2005
Title Fabric and texture at Siple Dome, Antarctica
DOI 10.3189/172756505781829359
Authors C. L. Diprinzio, Lawrence A. Wilen, R. B. Alley, J. J. Fitzpatrick, M. K. Spencer, A. J. Gow
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Glaciology
Series Number
Index ID 70027427
Record Source USGS Publications Warehouse
USGS Organization Geosciences and Environmental Change Science Center