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Stratigraphy and glaciotectonics structures of a relict deforming bed of permafrost at the northwestern margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada

Murton, Julian B., Waller, Richard I., Hart, Jane K., Whiteman, Colin A., Pollard, Wayne H. and Clark, Ian D. (2004) Stratigraphy and glaciotectonics structures of a relict deforming bed of permafrost at the northwestern margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada Journal of Glaciology, 50, (170), pp. 399-412. (doi:10.3189/172756504781829927).

Record type: Article

Abstract

The upper 5-20 m of ice-rich permafrost at three sites overridden by the northwest margin of the Laurentide ice sheet in the Tuktoyaktuk Coastlands, western Arctic Canada, comprise massive ice beneath ice-rich diamicton or sandy silt. The diamicton and silt contain (1) truncated ice blocks up to 15 m long, (2) sand lenses and layers, (3) ice veins dipping at 20-30°, (4) ice lenses adjacent and parallel to sedimentary contacts, and (5) ice wedges. The massive ice is interpreted as intrasedimental or buried basal glacier ice, and the diamicton and silt as glacitectonite that has never thawed. Deformation of frozen ground was mainly ductile in character. Deformation was accompanied by sub-marginal erosion of permafrost, which formed an angular unconformity along the top of the massive ice and supplied ice clasts and sand bodies to the overlying glacitectonite. After deformation and erosion ceased, postglacial segregated ice and ice-wedge ice developed within the deformed permafrost.

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Published date: June 2004

Identifiers

Local EPrints ID: 55432
URI: http://eprints.soton.ac.uk/id/eprint/55432
PURE UUID: 3523c9f8-ce52-42f5-a020-6f727d8cb4be
ORCID for Jane K. Hart: ORCID iD orcid.org/0000-0002-2348-3944

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Date deposited: 31 Jul 2008
Last modified: 17 Jul 2017 14:33

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Contributors

Author: Julian B. Murton
Author: Richard I. Waller
Author: Jane K. Hart ORCID iD
Author: Colin A. Whiteman
Author: Wayne H. Pollard
Author: Ian D. Clark

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