Show simple item record Cook, Simon J. Swift, Darrel A. Graham, David J. Midgley, Nicholas G. 2011-11-01T11:11:25Z 2011-11-01T11:11:25Z 2011-11-01
dc.identifier.citation Cook , S J , Swift , D A , Graham , D J & Midgley , N G 2011 , ' Origin and significance of 'dispersed fades' basal ice: Svinafellsjokull, Iceland ' Journal of Glaciology , pp. 710-720 . en
dc.identifier.issn 0022-1430
dc.identifier.other PURE: 172717
dc.identifier.other PURE UUID: 71fd7a22-3f95-4812-9ff0-74216a2930b9
dc.identifier.other dspace: 2160/7651
dc.description Cook, S. J., Swift, D. A., Graham, D. J., Midgley, N. G. (2011). Origin and significance of 'dispersed fades' basal ice: Svinafellsjokull, Iceland. Journal of Glaciology, 57 (204), 710-720. en
dc.description.abstract Dispersed facies basal ice - massive (i.e. structureless) ice with dispersed debris aggregates - is present at the margins of many glaciers and, as a product of internal glacial processes, has the potential to provide important information about the mechanisms of glacier flow and the nature of the subglacial environment. The origin of dispersed facies is poorly understood, with several hypotheses having been advanced for its formation, and there is disagreement as to whether it is largely a sedimentary or a tectonic feature. We test these established hypotheses at the temperate glacier Svinafellsjokull, Iceland, and find that none fully account for dispersed facies characteristics at this location. Instead, dispersed facies physical, sedimentological and stable-isotope (delta(18)O, delta D) characteristics favour a predominantly tectonic origin that we suggest comprises the regelation and strain-induced metamorphism of debris-rich basal ice that has been entrained into an englacial position by tectonic processes operating at the base of an icefall. Further thickening of the resultant dispersed facies may also occur tectonically as a result of ice flow against the reverse bed slope of a terminal overdeepening. Lack of efficient subglacial drainage in the region of the overdeepening may limit basal melting and thus favour basal ice preservation, including the preservation of dispersed facies. Despite the relatively low sediment content of dispersed facies (similar to 1.6% by volume), its thickness (up to 25 m) and ubiquity at Svinafellsjokull results in a significant contribution to annual sediment discharge (1635-3270 m(3) a(-1)) that is similar to 6.5 times that contributed by debris-rich stratified facies basal ice en
dc.format.extent 11 en
dc.language.iso eng
dc.relation.ispartof Journal of Glaciology en
dc.rights en
dc.title Origin and significance of 'dispersed fades' basal ice: Svinafellsjokull, Iceland en
dc.type /dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article en
dc.contributor.institution Department of Geography and Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en

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