Fabric and texture at Siple Dome, Antarctica

C. L. Diprinzio, L. A. Wilen, R. B. Alley, J. J. Fitzpatrick, M. K. Spencer, A. J. Gow

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Abstract

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 700-780 m 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.

Original languageEnglish
Pages (from-to)281-290
Number of pages10
JournalJournal of Glaciology
Volume51
Issue number173
Publication statusPublished - 2005
Externally publishedYes

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ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Diprinzio, C. L., Wilen, L. A., Alley, R. B., Fitzpatrick, J. J., Spencer, M. K., & Gow, A. J. (2005). Fabric and texture at Siple Dome, Antarctica. Journal of Glaciology, 51(173), 281-290.