Some Mechanisms of Controlled Moraine Development, Antarctica
Abstract Contemporary processes of moraine development at the margins of polar glaciers encompass a wide range of subtly different mechanisms. Two types of “controlled” moraine evolution, applicable to hummocks and transverse moraine ridges, are identified from Wright Lower Glacier and Webb Glacier,...
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Cambridge University Press (CUP)
1981
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Online Access: | http://dx.doi.org/10.1017/s0022143000011278 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000011278 |
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crcambridgeupr:10.1017/s0022143000011278 2024-03-03T08:38:36+00:00 Some Mechanisms of Controlled Moraine Development, Antarctica Rains, R. B. Shaw, J. 1981 http://dx.doi.org/10.1017/s0022143000011278 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000011278 en eng Cambridge University Press (CUP) Journal of Glaciology volume 27, issue 95, page 113-128 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1981 crcambridgeupr https://doi.org/10.1017/s0022143000011278 2024-02-08T08:41:37Z Abstract Contemporary processes of moraine development at the margins of polar glaciers encompass a wide range of subtly different mechanisms. Two types of “controlled” moraine evolution, applicable to hummocks and transverse moraine ridges, are identified from Wright Lower Glacier and Webb Glacier, southern Victoria Land, Antarctica. Type 1 moraine complexes involve a relatively abundant supply of supraglacial debris, the development of transverse thrust blocks in the ablation-zone ice and the subsequent re-arrangement of ablation debris in ablation cusps and on inactive thrust blocks. Relict landform suites, apparently formed in this manner, reveal large coarse-grained hummocks inset behind moraine ridge remnants. Type 2 moraines may develop where the supply of supraglacial debris is meagre but the growth of ablation cusps concentrates primarily englacial debris into small irregular hummocks. The gravel component of this debris is usually of finer texture than for type 1 deposits, reflecting abrasion/attrition effects of prior englacial transportation. Transverse moraine ridges may or may not be associated with type 2 hummocks, depending on local variations of ice motion, ice decay, and debris supply. Article in Journal/Newspaper Antarc* Antarctica Journal of Glaciology Victoria Land Webb Glacier Wright Lower Glacier Cambridge University Press Victoria Land Webb ENVELOPE(146.867,146.867,-67.867,-67.867) Moraine Ridge ENVELOPE(168.050,168.050,-72.300,-72.300) Wright Lower Glacier ENVELOPE(163.000,163.000,-77.417,-77.417) Journal of Glaciology 27 95 113 128 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Rains, R. B. Shaw, J. Some Mechanisms of Controlled Moraine Development, Antarctica |
topic_facet |
Earth-Surface Processes |
description |
Abstract Contemporary processes of moraine development at the margins of polar glaciers encompass a wide range of subtly different mechanisms. Two types of “controlled” moraine evolution, applicable to hummocks and transverse moraine ridges, are identified from Wright Lower Glacier and Webb Glacier, southern Victoria Land, Antarctica. Type 1 moraine complexes involve a relatively abundant supply of supraglacial debris, the development of transverse thrust blocks in the ablation-zone ice and the subsequent re-arrangement of ablation debris in ablation cusps and on inactive thrust blocks. Relict landform suites, apparently formed in this manner, reveal large coarse-grained hummocks inset behind moraine ridge remnants. Type 2 moraines may develop where the supply of supraglacial debris is meagre but the growth of ablation cusps concentrates primarily englacial debris into small irregular hummocks. The gravel component of this debris is usually of finer texture than for type 1 deposits, reflecting abrasion/attrition effects of prior englacial transportation. Transverse moraine ridges may or may not be associated with type 2 hummocks, depending on local variations of ice motion, ice decay, and debris supply. |
format |
Article in Journal/Newspaper |
author |
Rains, R. B. Shaw, J. |
author_facet |
Rains, R. B. Shaw, J. |
author_sort |
Rains, R. B. |
title |
Some Mechanisms of Controlled Moraine Development, Antarctica |
title_short |
Some Mechanisms of Controlled Moraine Development, Antarctica |
title_full |
Some Mechanisms of Controlled Moraine Development, Antarctica |
title_fullStr |
Some Mechanisms of Controlled Moraine Development, Antarctica |
title_full_unstemmed |
Some Mechanisms of Controlled Moraine Development, Antarctica |
title_sort |
some mechanisms of controlled moraine development, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1981 |
url |
http://dx.doi.org/10.1017/s0022143000011278 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000011278 |
long_lat |
ENVELOPE(146.867,146.867,-67.867,-67.867) ENVELOPE(168.050,168.050,-72.300,-72.300) ENVELOPE(163.000,163.000,-77.417,-77.417) |
geographic |
Victoria Land Webb Moraine Ridge Wright Lower Glacier |
geographic_facet |
Victoria Land Webb Moraine Ridge Wright Lower Glacier |
genre |
Antarc* Antarctica Journal of Glaciology Victoria Land Webb Glacier Wright Lower Glacier |
genre_facet |
Antarc* Antarctica Journal of Glaciology Victoria Land Webb Glacier Wright Lower Glacier |
op_source |
Journal of Glaciology volume 27, issue 95, page 113-128 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000011278 |
container_title |
Journal of Glaciology |
container_volume |
27 |
container_issue |
95 |
container_start_page |
113 |
op_container_end_page |
128 |
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1792507008435355648 |