Ice petrofabrics, Tuktoyaktuk, N.W.T., Canada
This thesis attempts to elucidate the origin and deformation of a folded sequence of ice and icy sediment in Tuktoyaktuk, N.W.T., Canada. Tuktoyaktuk lies between the maximum and late Wisconsin limits of glaciation. Bodies of underground ice in permafrost have characteristic ice crystal sizes and sh...
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University of British Columbia
1973
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ftunivbritcolcir:oai:circle.library.ubc.ca:2429/33013 2023-05-15T16:37:17+02:00 Ice petrofabrics, Tuktoyaktuk, N.W.T., Canada Gell, Alan William 1973 http://hdl.handle.net/2429/33013 eng eng University of British Columbia For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. Ice -- Northwest Territories Canada -- Tuktoyaktuk Text Thesis/Dissertation 1973 ftunivbritcolcir 2019-10-15T18:02:59Z This thesis attempts to elucidate the origin and deformation of a folded sequence of ice and icy sediment in Tuktoyaktuk, N.W.T., Canada. Tuktoyaktuk lies between the maximum and late Wisconsin limits of glaciation. Bodies of underground ice in permafrost have characteristic ice crystal sizes and shapes and inclusions dependent on the mode of ice growth and subsequent deformational or other history. The ice body which was studied lies beneath 2 m of fluvioglacial sands and 0.6 m of gravel. The ice-icy sediment foliation has been deformed into subhorizontal isoclinal folds, the major movement being from the SSW. Folds are classified into three styles. Fabric diagrams of ice crystal optic axes are of two types. A relict early fold shows a cleft girdle pattern at right-angles to the fold axis. Later flattening and fold limb extension has given rise to fabric diagrams with strong maxima normal to the axial surfaces, showing that crystals have rotated such that slip planes are parallel to the surface of slip of the body. Differences in deformabilities of pure ice and ice with varying amounts of sand have given rise to boudinage and transposition-type structures. Four types of grain texture indicative of recrystallization and dependence on sediment, are distinguished. It is not possible, with the available evidence, to distinguish between two alternative origins of the body as segregated ground ice overridden by an ice-sheet or a remnant of a deformed ice-sheet terminus. Necessary conditions for the survival of either body may be inferred. Petrographic characteristics are listed for future field recognition of the ice type. Arts, Faculty of Geography, Department of Graduate Thesis Ice Ice Sheet Northwest Territories permafrost Tuktoyaktuk University of British Columbia: cIRcle - UBC's Information Repository Canada Northwest Territories Tuktoyaktuk ENVELOPE(-133.006,-133.006,69.425,69.425) |
institution |
Open Polar |
collection |
University of British Columbia: cIRcle - UBC's Information Repository |
op_collection_id |
ftunivbritcolcir |
language |
English |
topic |
Ice -- Northwest Territories Canada -- Tuktoyaktuk |
spellingShingle |
Ice -- Northwest Territories Canada -- Tuktoyaktuk Gell, Alan William Ice petrofabrics, Tuktoyaktuk, N.W.T., Canada |
topic_facet |
Ice -- Northwest Territories Canada -- Tuktoyaktuk |
description |
This thesis attempts to elucidate the origin and deformation of a folded sequence of ice and icy sediment in Tuktoyaktuk, N.W.T., Canada. Tuktoyaktuk lies between the maximum and late Wisconsin limits of glaciation. Bodies of underground ice in permafrost have characteristic ice crystal sizes and shapes and inclusions dependent on the mode of ice growth and subsequent deformational or other history. The ice body which was studied lies beneath 2 m of fluvioglacial sands and 0.6 m of gravel. The ice-icy sediment foliation has been deformed into subhorizontal isoclinal folds, the major movement being from the SSW. Folds are classified into three styles. Fabric diagrams of ice crystal optic axes are of two types. A relict early fold shows a cleft girdle pattern at right-angles to the fold axis. Later flattening and fold limb extension has given rise to fabric diagrams with strong maxima normal to the axial surfaces, showing that crystals have rotated such that slip planes are parallel to the surface of slip of the body. Differences in deformabilities of pure ice and ice with varying amounts of sand have given rise to boudinage and transposition-type structures. Four types of grain texture indicative of recrystallization and dependence on sediment, are distinguished. It is not possible, with the available evidence, to distinguish between two alternative origins of the body as segregated ground ice overridden by an ice-sheet or a remnant of a deformed ice-sheet terminus. Necessary conditions for the survival of either body may be inferred. Petrographic characteristics are listed for future field recognition of the ice type. Arts, Faculty of Geography, Department of Graduate |
format |
Thesis |
author |
Gell, Alan William |
author_facet |
Gell, Alan William |
author_sort |
Gell, Alan William |
title |
Ice petrofabrics, Tuktoyaktuk, N.W.T., Canada |
title_short |
Ice petrofabrics, Tuktoyaktuk, N.W.T., Canada |
title_full |
Ice petrofabrics, Tuktoyaktuk, N.W.T., Canada |
title_fullStr |
Ice petrofabrics, Tuktoyaktuk, N.W.T., Canada |
title_full_unstemmed |
Ice petrofabrics, Tuktoyaktuk, N.W.T., Canada |
title_sort |
ice petrofabrics, tuktoyaktuk, n.w.t., canada |
publisher |
University of British Columbia |
publishDate |
1973 |
url |
http://hdl.handle.net/2429/33013 |
long_lat |
ENVELOPE(-133.006,-133.006,69.425,69.425) |
geographic |
Canada Northwest Territories Tuktoyaktuk |
geographic_facet |
Canada Northwest Territories Tuktoyaktuk |
genre |
Ice Ice Sheet Northwest Territories permafrost Tuktoyaktuk |
genre_facet |
Ice Ice Sheet Northwest Territories permafrost Tuktoyaktuk |
op_rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
_version_ |
1766027578125058048 |