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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2012
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ftvliz:oai:oma.vliz.be:219485 2023-05-15T13:33:16+02:00 Optical-televiewer-based identification and characterization of material facies associated with an Antarctic ice-shelf rift Hubbard, B. Tison, J.-L. Pattyn, F. Dierckx, M. Boereboom, T. Samyn, D. 2012 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=219485 en eng info:eu-repo/semantics/altIdentifier/wos/000315310400002 info:eu-repo/semantics/altIdentifier/doi/oi.org/10.3189/2012AoG60A045 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=219485 info:eu-repo/semantics/restrictedAccess %3Ci%3EAnn.+Glaciol.+53%2860%29%3C%2Fi%3E%3A+137-146.+%3Ca+href%3D%22http%3A%2F%2Fdx.doi.org%2F10.3189%2F2012AoG60A045%22+target%3D%22_blank%22%3Ehttp%3A%2F%2Fdx.doi.org%2F10.3189%2F2012AoG60A045%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2012 ftvliz https://doi.org/10.3189/2012AoG60A045 2022-05-01T09:49:56Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Shelf Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Antarctic East Antarctica Roi Baudouin ENVELOPE(24.461,24.461,-70.438,-70.438) Annals of Glaciology 53 60 137 146 |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
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. |
format |
Article in Journal/Newspaper |
author |
Hubbard, B. Tison, J.-L. Pattyn, F. Dierckx, M. Boereboom, T. Samyn, D. |
spellingShingle |
Hubbard, B. Tison, J.-L. Pattyn, F. Dierckx, M. Boereboom, T. Samyn, D. Optical-televiewer-based identification and characterization of material facies associated with an Antarctic ice-shelf rift |
author_facet |
Hubbard, B. Tison, J.-L. Pattyn, F. Dierckx, M. Boereboom, T. Samyn, D. |
author_sort |
Hubbard, B. |
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://www.vliz.be/nl/open-marien-archief?module=ref&refid=219485 |
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 |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf |
op_source |
%3Ci%3EAnn.+Glaciol.+53%2860%29%3C%2Fi%3E%3A+137-146.+%3Ca+href%3D%22http%3A%2F%2Fdx.doi.org%2F10.3189%2F2012AoG60A045%22+target%3D%22_blank%22%3Ehttp%3A%2F%2Fdx.doi.org%2F10.3189%2F2012AoG60A045%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000315310400002 info:eu-repo/semantics/altIdentifier/doi/oi.org/10.3189/2012AoG60A045 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=219485 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3189/2012AoG60A045 |
container_title |
Annals of Glaciology |
container_volume |
53 |
container_issue |
60 |
container_start_page |
137 |
op_container_end_page |
146 |
_version_ |
1766040718898364416 |