Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada

Murton, J.B., Waller, R.I., Hart, J.K., Whiteman, C.A., Pollard, W.H. and Clark, I.D. (2004) Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada Journal of Glaciology, 50 (170). pp. 399-412. ISSN 0022-1430

Full text not available from this repository.

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.

Item Type: Journal article
Uncontrolled Keywords: Western artic coast; rich basal-ice; pleistocene permafrost; Mackenzie-Delta; glacier; Alaska; island; deformation; territories; deposition
Subjects: F000 Physical Sciences > F800 Physical Geography and Environmental Sciences > F850 Environmental Sciences
DOI (a stable link to the resource): 10.3189/172756504781829927
Faculties: Faculty of Science and Engineering > School of Environment and Technology > Applied Geosciences
Faculty of Science and Engineering > School of Environment and Technology
Depositing User: editor environment
Date Deposited: 23 Nov 2006
Last Modified: 11 Dec 2013 14:55
URI: http://eprints.brighton.ac.uk/id/eprint/1154

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year