Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

Ice stream motion facilitated by a shallow-deforming and accreting bed.

Spagnolo, M. and Phillips, E. and Piotrowski, J.A. and Rea, B.R. and Clark, C.D. and Stokes, C.R. and Carr, S.J. and Ely, J.C. and Ribolini, A. and Wysota, W. and Szuman, I. (2016) 'Ice stream motion facilitated by a shallow-deforming and accreting bed.', Nature communications., 7 . p. 10723.

Abstract

Ice streams drain large portions of ice sheets and play a fundamental role in governing their response to atmospheric and oceanic forcing, with implications for sea-level change. The mechanisms that generate ice stream flow remain elusive. Basal sliding and/or bed deformation have been hypothesized, but ice stream beds are largely inaccessible. Here we present a comprehensive, multi-scale study of the internal structure of mega-scale glacial lineations (MSGLs) formed at the bed of a palaeo ice stream. Analyses were undertaken at macro- and microscales, using multiple techniques including X-ray tomography, thin sections and ground penetrating radar (GPR) acquisitions. Results reveal homogeneity in stratigraphy, kinematics, granulometry and petrography. The consistency of the physical and geological properties demonstrates a continuously accreting, shallow-deforming, bed and invariant basal conditions. This implies that ice stream basal motion on soft sediment beds during MSGL formation is accommodated by plastic deformation, facilitated by continuous sediment supply and an inefficient drainage system.

Item Type:Article
Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution.
Download PDF
(4015Kb)
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution.
Download PDF
(4827Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1038/ncomms10723
Publisher statement:This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Date accepted:14 January 2016
Date deposited:05 April 2016
Date of first online publication:22 February 2016
Date first made open access:No date available

Save or Share this output

Export:
Export
Look up in GoogleScholar