Fabric and texture at Siple Dome, Antarctica
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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 700–780m 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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Fabric and texture at Siple Dome, Antarctica |
| Series title | Journal of Glaciology |
| DOI | 10.3189/172756505781829359 |
| Volume | 51 |
| Issue | 173 |
| Year Published | 2005 |
| Language | English |
| Publisher | Oxford University Press |
| Contributing office(s) | Geosciences and Environmental Change Science Center |
| Description | 10 p. |
| First page | 281 |
| Last page | 290 |
| Other Geospatial | Antarctica |
| Google Analytic Metrics | Metrics page |