Experiments Relating to the Fracture of Bedrock at the Ice-Rock Interface
Abstract MacClintock (1953) has suggested that arcuate features formed on glass by the impression of steel ball bearings may be analogous to crescentic gouges observed on formerly glaciated rock surfaces. He noted that cracks, convex in the direction of movement, are formed as bearings roll over a g...
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Language: | English |
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Cambridge University Press (CUP)
1984
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Online Access: | http://dx.doi.org/10.1017/s0022143000008583 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000008583 |
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crcambridgeupr:10.1017/s0022143000008583 2024-03-03T08:45:58+00:00 Experiments Relating to the Fracture of Bedrock at the Ice-Rock Interface Smith, Jennifer M. 1984 http://dx.doi.org/10.1017/s0022143000008583 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000008583 en eng Cambridge University Press (CUP) Journal of Glaciology volume 30, issue 104, page 123-125 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1984 crcambridgeupr https://doi.org/10.1017/s0022143000008583 2024-02-08T08:37:11Z Abstract MacClintock (1953) has suggested that arcuate features formed on glass by the impression of steel ball bearings may be analogous to crescentic gouges observed on formerly glaciated rock surfaces. He noted that cracks, convex in the direction of movement, are formed as bearings roll over a glass surface but not as they slide over it. MacClintock therefore proposed that the similarly orientated crescentic gouges may owe their origin to abrading clasts rolling along a glacier bed. This note describes simple experiments designed to test this view by generating friction cracks artificially. Cracks convex and concave in the direction of movement were produced by a non-rolling bearing — a result apparently incompatible with MacClintock’s proposal. It is suggested that the orientation of such cracks is less dependent on bearing rotation and more the result of pressure variation. Cracks analogous to crescentic gouges may form as a result of unloading. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 30 104 123 125 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Smith, Jennifer M. Experiments Relating to the Fracture of Bedrock at the Ice-Rock Interface |
topic_facet |
Earth-Surface Processes |
description |
Abstract MacClintock (1953) has suggested that arcuate features formed on glass by the impression of steel ball bearings may be analogous to crescentic gouges observed on formerly glaciated rock surfaces. He noted that cracks, convex in the direction of movement, are formed as bearings roll over a glass surface but not as they slide over it. MacClintock therefore proposed that the similarly orientated crescentic gouges may owe their origin to abrading clasts rolling along a glacier bed. This note describes simple experiments designed to test this view by generating friction cracks artificially. Cracks convex and concave in the direction of movement were produced by a non-rolling bearing — a result apparently incompatible with MacClintock’s proposal. It is suggested that the orientation of such cracks is less dependent on bearing rotation and more the result of pressure variation. Cracks analogous to crescentic gouges may form as a result of unloading. |
format |
Article in Journal/Newspaper |
author |
Smith, Jennifer M. |
author_facet |
Smith, Jennifer M. |
author_sort |
Smith, Jennifer M. |
title |
Experiments Relating to the Fracture of Bedrock at the Ice-Rock Interface |
title_short |
Experiments Relating to the Fracture of Bedrock at the Ice-Rock Interface |
title_full |
Experiments Relating to the Fracture of Bedrock at the Ice-Rock Interface |
title_fullStr |
Experiments Relating to the Fracture of Bedrock at the Ice-Rock Interface |
title_full_unstemmed |
Experiments Relating to the Fracture of Bedrock at the Ice-Rock Interface |
title_sort |
experiments relating to the fracture of bedrock at the ice-rock interface |
publisher |
Cambridge University Press (CUP) |
publishDate |
1984 |
url |
http://dx.doi.org/10.1017/s0022143000008583 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000008583 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 30, issue 104, page 123-125 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000008583 |
container_title |
Journal of Glaciology |
container_volume |
30 |
container_issue |
104 |
container_start_page |
123 |
op_container_end_page |
125 |
_version_ |
1792501696024281088 |