Optical-televiewer-based identification and characterization of material facies associated with an antarctic ice-shelf rift
We have drilled 13 boreholes within and around a through-cutting rift on the (unofficially named) Roi Baudouin Ice Shelf, East Antarctica. Logging by optical televiewer (OPTV) combined with core inspection has resulted in the identification and characterization of several material facies. Outside th...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/167865 2023-05-15T13:29:19+02:00 Optical-televiewer-based identification and characterization of material facies associated with an antarctic ice-shelf rift Hubbard, Bryn Tison, Jean-Louis Pattyn, Frank Dierckx, Marie Boereboom, Thierry Samyn, Denis 2012-11 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/167865 https://dipot.ulb.ac.be/dspace/bitstream/2013/167865/3/doi_151495.pdf en eng uri/info:doi/10.3189/2012AoG60A045 uri/info:scp/84867640075 https://dipot.ulb.ac.be/dspace/bitstream/2013/167865/3/doi_151495.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/167865 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Annals of glaciology, 53 (60 Géologie et minéralogie info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2012 ftunivbruxelles 2022-06-12T22:09:17Z We have drilled 13 boreholes within and around a through-cutting rift on the (unofficially named) Roi Baudouin Ice Shelf, East Antarctica. Logging by optical televiewer (OPTV) combined with core inspection has resulted in the identification and characterization of several material facies. Outside the rift, OPTV-imaged annual layering indicates ≈150 years of accumulation over the 66m length of one of the boreholes. Luminosity analysis of this image also reveals the presence of numerous dark melt layers as well as a systematic decrease in background luminosity, interpreted in terms of a progressive increase in light transmission during firnification. We identify four material facies within the rift: snow, granular ice, marine ice and unconsolidated platelets. We interpret the granular ice facies as snow that has been saturated by percolating sea water, and the underlying marine ice as compacted buoyant platelets that have adhered to the rift base. Core sections reveal the presence of tubular channels within the marine ice, indicating that it is macroporous and permeable to sea water. The lower boundary of this facies merges into a mushy layer of unconsolidated platelets that were successfully imaged by OPTV, revealing irregular sub-horizontal layering similar to that reported previously on the basis of (directional) borehole video. © 2012 Publishing Technology. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Antarctica East Antarctica Ice Shelf DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic East Antarctica Roi Baudouin ENVELOPE(24.461,24.461,-70.438,-70.438) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Géologie et minéralogie |
spellingShingle |
Géologie et minéralogie Hubbard, Bryn Tison, Jean-Louis Pattyn, Frank Dierckx, Marie Boereboom, Thierry Samyn, Denis Optical-televiewer-based identification and characterization of material facies associated with an antarctic ice-shelf rift |
topic_facet |
Géologie et minéralogie |
description |
We have drilled 13 boreholes within and around a through-cutting rift on the (unofficially named) Roi Baudouin Ice Shelf, East Antarctica. Logging by optical televiewer (OPTV) combined with core inspection has resulted in the identification and characterization of several material facies. Outside the rift, OPTV-imaged annual layering indicates ≈150 years of accumulation over the 66m length of one of the boreholes. Luminosity analysis of this image also reveals the presence of numerous dark melt layers as well as a systematic decrease in background luminosity, interpreted in terms of a progressive increase in light transmission during firnification. We identify four material facies within the rift: snow, granular ice, marine ice and unconsolidated platelets. We interpret the granular ice facies as snow that has been saturated by percolating sea water, and the underlying marine ice as compacted buoyant platelets that have adhered to the rift base. Core sections reveal the presence of tubular channels within the marine ice, indicating that it is macroporous and permeable to sea water. The lower boundary of this facies merges into a mushy layer of unconsolidated platelets that were successfully imaged by OPTV, revealing irregular sub-horizontal layering similar to that reported previously on the basis of (directional) borehole video. © 2012 Publishing Technology. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Hubbard, Bryn Tison, Jean-Louis Pattyn, Frank Dierckx, Marie Boereboom, Thierry Samyn, Denis |
author_facet |
Hubbard, Bryn Tison, Jean-Louis Pattyn, Frank Dierckx, Marie Boereboom, Thierry Samyn, Denis |
author_sort |
Hubbard, Bryn |
title |
Optical-televiewer-based identification and characterization of material facies associated with an antarctic ice-shelf rift |
title_short |
Optical-televiewer-based identification and characterization of material facies associated with an antarctic ice-shelf rift |
title_full |
Optical-televiewer-based identification and characterization of material facies associated with an antarctic ice-shelf rift |
title_fullStr |
Optical-televiewer-based identification and characterization of material facies associated with an antarctic ice-shelf rift |
title_full_unstemmed |
Optical-televiewer-based identification and characterization of material facies associated with an antarctic ice-shelf rift |
title_sort |
optical-televiewer-based identification and characterization of material facies associated with an antarctic ice-shelf rift |
publishDate |
2012 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/167865 https://dipot.ulb.ac.be/dspace/bitstream/2013/167865/3/doi_151495.pdf |
long_lat |
ENVELOPE(24.461,24.461,-70.438,-70.438) |
geographic |
Antarctic East Antarctica Roi Baudouin |
geographic_facet |
Antarctic East Antarctica Roi Baudouin |
genre |
Annals of Glaciology Antarc* Antarctic Antarctica East Antarctica Ice Shelf |
genre_facet |
Annals of Glaciology Antarc* Antarctic Antarctica East Antarctica Ice Shelf |
op_source |
Annals of glaciology, 53 (60 |
op_relation |
uri/info:doi/10.3189/2012AoG60A045 uri/info:scp/84867640075 https://dipot.ulb.ac.be/dspace/bitstream/2013/167865/3/doi_151495.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/167865 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1765999898458587136 |