Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet
It has been hypothesized that complex englacial structures identified within the East Antarctic and Greenland ice sheets are generated by (i) water freezing to the ice sheet base and evolving under ice flow, (ii) deformation of ice of varying rheology, or (iii) entrainment of basal material. Using i...
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ftdoajarticles:oai:doaj.org/article:074f11a97f9e4f648c02c78130d70098 2023-05-15T14:03:35+02:00 Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet N. Ross H. Corr M. Siegert 2020-06-01T00:00:00Z https://doi.org/10.5194/tc-14-2103-2020 https://doaj.org/article/074f11a97f9e4f648c02c78130d70098 EN eng Copernicus Publications https://tc.copernicus.org/articles/14/2103/2020/tc-14-2103-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-2103-2020 1994-0416 1994-0424 https://doaj.org/article/074f11a97f9e4f648c02c78130d70098 The Cryosphere, Vol 14, Pp 2103-2114 (2020) Environmental sciences GE1-350 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.5194/tc-14-2103-2020 2022-12-31T00:52:17Z It has been hypothesized that complex englacial structures identified within the East Antarctic and Greenland ice sheets are generated by (i) water freezing to the ice sheet base and evolving under ice flow, (ii) deformation of ice of varying rheology, or (iii) entrainment of basal material. Using ice-penetrating radar, we identify a widespread complex of deep-ice facies in West Antarctica that exist in the absence of basal water. These deep-ice units are extensive, thick ( >500 m), and incorporate multiple highly reflective englacial layers. At the lateral margin of an enhanced flow tributary of the Institute Ice Stream, these units are heavily deformed and folded by the action of lateral flow convergence. Radar reflectivity analysis demonstrates that the uppermost reflector of the deep-ice package is highly anisotropic, due to abrupt alternations in crystal orientation fabric, and consequently will have a different rheology to the ice above and below it. Deformation and folding of the deep-ice package is an englacial response to the combination of laterally-convergent ice flow and the physical properties of the ice column. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland Ice Sheet Institute Ice Stream The Cryosphere West Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic West Antarctica West Antarctic Ice Sheet Greenland Institute Ice Stream ENVELOPE(-75.000,-75.000,-82.000,-82.000) The Cryosphere 14 6 2103 2114 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 N. Ross H. Corr M. Siegert Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
It has been hypothesized that complex englacial structures identified within the East Antarctic and Greenland ice sheets are generated by (i) water freezing to the ice sheet base and evolving under ice flow, (ii) deformation of ice of varying rheology, or (iii) entrainment of basal material. Using ice-penetrating radar, we identify a widespread complex of deep-ice facies in West Antarctica that exist in the absence of basal water. These deep-ice units are extensive, thick ( >500 m), and incorporate multiple highly reflective englacial layers. At the lateral margin of an enhanced flow tributary of the Institute Ice Stream, these units are heavily deformed and folded by the action of lateral flow convergence. Radar reflectivity analysis demonstrates that the uppermost reflector of the deep-ice package is highly anisotropic, due to abrupt alternations in crystal orientation fabric, and consequently will have a different rheology to the ice above and below it. Deformation and folding of the deep-ice package is an englacial response to the combination of laterally-convergent ice flow and the physical properties of the ice column. |
format |
Article in Journal/Newspaper |
author |
N. Ross H. Corr M. Siegert |
author_facet |
N. Ross H. Corr M. Siegert |
author_sort |
N. Ross |
title |
Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet |
title_short |
Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet |
title_full |
Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet |
title_fullStr |
Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet |
title_full_unstemmed |
Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet |
title_sort |
large-scale englacial folding and deep-ice stratigraphy within the west antarctic ice sheet |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-2103-2020 https://doaj.org/article/074f11a97f9e4f648c02c78130d70098 |
long_lat |
ENVELOPE(-75.000,-75.000,-82.000,-82.000) |
geographic |
Antarctic West Antarctica West Antarctic Ice Sheet Greenland Institute Ice Stream |
geographic_facet |
Antarctic West Antarctica West Antarctic Ice Sheet Greenland Institute Ice Stream |
genre |
Antarc* Antarctic Antarctica Greenland Ice Sheet Institute Ice Stream The Cryosphere West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Greenland Ice Sheet Institute Ice Stream The Cryosphere West Antarctica |
op_source |
The Cryosphere, Vol 14, Pp 2103-2114 (2020) |
op_relation |
https://tc.copernicus.org/articles/14/2103/2020/tc-14-2103-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-2103-2020 1994-0416 1994-0424 https://doaj.org/article/074f11a97f9e4f648c02c78130d70098 |
op_doi |
https://doi.org/10.5194/tc-14-2103-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
6 |
container_start_page |
2103 |
op_container_end_page |
2114 |
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1766274271137497088 |