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Rotating micro-structures in Antarctic cold basal ice : implications for glacier flow and its interpretation

Samyn, Denis (author)
Uppsala universitet,Luft-, vatten- och landskapslära
Fitzsimons, Sean J. (author)
Lorrain, Reginald D. (author)
 (creator_code:org_t)
2009-08-23
2010
English.
In: International journal of earth sciences. - : Springer Science and Business Media LLC. - 1437-3254 .- 1437-3262. ; 99:8, s. 1849-1857
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Structural analyses were conducted in the basal zone of an Antarctic glacier The studied basal ice sequence was retrieved from a 20-m-long subglacial tunnel dug at the margin of the glacier and is at the temperature of -17 degrees C For the first time, rotating clast systems embedded within debris-rich ice were thin-sectioned using specially designed cutting techniques The observed structures reflect the occurrence of pervasive shearing at the base of the glacier, and can be used as shear sense indicators In addition, some of these structures provide evidence for the presence of thin liquid films at the time of formation despite the marked freezing temperature of the ice It is showed here that cautious analysis of deformation structures present in debris-bearing ice may bring insights not only into the flow dynamics of the embedding matrix, but also Into the behaviour of the interstitial fluid network at the base of cold glaciers and ice sheets.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

Keyword

Strain figures
Porphyroclasts
Basal ice
Thin liquid films
Ice rheology
Antarctica
Dry Valleys
Earth sciences
Geovetenskap

Publication and Content Type

ref (subject category)
art (subject category)

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