Meserve Glacier Wright Valley, Antarctica: Part I. Basal Processes
Prepared for the National Science Foundation, Washington, DC. The University Archives has determined that this item is of continuing value to OSU's history. Basal ice between -17°C and -18°C is not free to slide on the boulder pavement on which the glacier rests. A debris-rich zone up to 0.6 m...
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Research Foundation and the Institute of Polar Studies, The Ohio State University
1974
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ftohiostateu:oai:kb.osu.edu:1811/47277 2023-05-15T13:58:11+02:00 Meserve Glacier Wright Valley, Antarctica: Part I. Basal Processes Holdsworth, Gerald 1974-06 application/pdf http://hdl.handle.net/1811/47277 en_US eng Research Foundation and the Institute of Polar Studies, The Ohio State University Institute of Polar Studies Report. 37 Holdsworth, Gerald. 1974. Meserve Glacier Wright Valley, Antarctica: Part I. Basal Processes. Institute of Polar Studies Report No. 37, Research Foundation and the Institute of Polar Studies, The Ohio State University, 104 pages. http://hdl.handle.net/1811/47277 Meserve Glacier Antarctica Wright Valley Technical Report Map 1974 ftohiostateu 2020-08-22T19:41:51Z Prepared for the National Science Foundation, Washington, DC. The University Archives has determined that this item is of continuing value to OSU's history. Basal ice between -17°C and -18°C is not free to slide on the boulder pavement on which the glacier rests. A debris-rich zone up to 0.6 m thick exists in the lowest part of the glacier. In addition, salts have diffused up to about 6 m above the base. Together these impurities have caused accelerated creep in the basal ice. Rocks, gripped in the deforming ice and rotating in response to the stress conditions in the ice, impinge on the tops of boulders fixed in the substratum, and produce "smears" of powdered minerals, mainly quartz and feldspar. These "smears" parallel the existing ice-flow direction. Cavities exist on the down-glacier side of the larger basal boulders and on some englacial pebbles. Vertical profiles of flow rate parallel to the bed of average slope 120 indicate that the exponent in the simple shear flow law ξ = (σxz/B)n may be as high as 5 or 6. Assuming approximate simple shear near the base of the glacier the diffusion coefficients of Na+ and Ca++ are of the order 107 cm2 s-1 (but could be an order of magnitude less depending on the interpretation of the data) assuming the time of diffusion is 1(±0.5) x 10^4 years. National Science Foundation Report Antarc* Antarctica Ohio State University (OSU): Knowledge Bank Boulder Pavement ENVELOPE(161.756,161.756,-77.523,-77.523) Meserve Glacier ENVELOPE(162.283,162.283,-77.517,-77.517) Wright Valley ENVELOPE(161.833,161.833,-77.517,-77.517) |
institution |
Open Polar |
collection |
Ohio State University (OSU): Knowledge Bank |
op_collection_id |
ftohiostateu |
language |
English |
topic |
Meserve Glacier Antarctica Wright Valley |
spellingShingle |
Meserve Glacier Antarctica Wright Valley Holdsworth, Gerald Meserve Glacier Wright Valley, Antarctica: Part I. Basal Processes |
topic_facet |
Meserve Glacier Antarctica Wright Valley |
description |
Prepared for the National Science Foundation, Washington, DC. The University Archives has determined that this item is of continuing value to OSU's history. Basal ice between -17°C and -18°C is not free to slide on the boulder pavement on which the glacier rests. A debris-rich zone up to 0.6 m thick exists in the lowest part of the glacier. In addition, salts have diffused up to about 6 m above the base. Together these impurities have caused accelerated creep in the basal ice. Rocks, gripped in the deforming ice and rotating in response to the stress conditions in the ice, impinge on the tops of boulders fixed in the substratum, and produce "smears" of powdered minerals, mainly quartz and feldspar. These "smears" parallel the existing ice-flow direction. Cavities exist on the down-glacier side of the larger basal boulders and on some englacial pebbles. Vertical profiles of flow rate parallel to the bed of average slope 120 indicate that the exponent in the simple shear flow law ξ = (σxz/B)n may be as high as 5 or 6. Assuming approximate simple shear near the base of the glacier the diffusion coefficients of Na+ and Ca++ are of the order 107 cm2 s-1 (but could be an order of magnitude less depending on the interpretation of the data) assuming the time of diffusion is 1(±0.5) x 10^4 years. National Science Foundation |
format |
Report |
author |
Holdsworth, Gerald |
author_facet |
Holdsworth, Gerald |
author_sort |
Holdsworth, Gerald |
title |
Meserve Glacier Wright Valley, Antarctica: Part I. Basal Processes |
title_short |
Meserve Glacier Wright Valley, Antarctica: Part I. Basal Processes |
title_full |
Meserve Glacier Wright Valley, Antarctica: Part I. Basal Processes |
title_fullStr |
Meserve Glacier Wright Valley, Antarctica: Part I. Basal Processes |
title_full_unstemmed |
Meserve Glacier Wright Valley, Antarctica: Part I. Basal Processes |
title_sort |
meserve glacier wright valley, antarctica: part i. basal processes |
publisher |
Research Foundation and the Institute of Polar Studies, The Ohio State University |
publishDate |
1974 |
url |
http://hdl.handle.net/1811/47277 |
long_lat |
ENVELOPE(161.756,161.756,-77.523,-77.523) ENVELOPE(162.283,162.283,-77.517,-77.517) ENVELOPE(161.833,161.833,-77.517,-77.517) |
geographic |
Boulder Pavement Meserve Glacier Wright Valley |
geographic_facet |
Boulder Pavement Meserve Glacier Wright Valley |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Institute of Polar Studies Report. 37 Holdsworth, Gerald. 1974. Meserve Glacier Wright Valley, Antarctica: Part I. Basal Processes. Institute of Polar Studies Report No. 37, Research Foundation and the Institute of Polar Studies, The Ohio State University, 104 pages. http://hdl.handle.net/1811/47277 |
_version_ |
1766266299457994752 |