Former Ice Shelves in the Canadian High Arctic
Abstract Moraines deposited by the outermost ice advance across Judge Daly Promontory, northeastern Ellesmere Island, reflect thin, topographically controlled ice lobes extending to sea-level. The termini of two ice lobes were investigated and both produced ice shelves where they flowed into isostat...
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Language: | English |
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Cambridge University Press (CUP)
1978
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Online Access: | http://dx.doi.org/10.1017/s0022143000013927 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000013927 |
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crcambridgeupr:10.1017/s0022143000013927 2024-03-03T08:41:44+00:00 Former Ice Shelves in the Canadian High Arctic England, John Bradley, R. S. Miller, G. H. 1978 http://dx.doi.org/10.1017/s0022143000013927 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000013927 en eng Cambridge University Press (CUP) Journal of Glaciology volume 20, issue 83, page 393-404 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1978 crcambridgeupr https://doi.org/10.1017/s0022143000013927 2024-02-08T08:36:10Z Abstract Moraines deposited by the outermost ice advance across Judge Daly Promontory, northeastern Ellesmere Island, reflect thin, topographically controlled ice lobes extending to sea-level. The termini of two ice lobes were investigated and both produced ice shelves where they flowed into isostatically depressed embayments along western Kennedy Channel. Morphological evidence for these ice shelves occurs at the entrance to these valleys where steeply descending lateral moraines become abruptly horizontal for 2 km. In addition, both the horizontal moraines and associated pro-glacial terraces are fossiliferous down-valley from the apparent grounding line. Based on the differences in elevation between the horizontal moraines and the valley bottoms, the two ice shelves had estimated thicknesses of c . 110 and 150 m. A proglacial outwash terrace at 175 m a.s.l. is considered to represent the approximate relative sea-level during the formation and break-up of the ice shelves. This relative sea-level is consistent with the water depths required to float the calculated ice thicknesses in both valleys. Associated with these ice margins are finite 14 C dates of 28 000-30 000 B.P. and amino-acid age estimates of >35 000 B.P. The importance and likelihood of additional past ice shelves in the Canadian High Arctic is discussed. Article in Journal/Newspaper Arctic Ellesmere Island Ice Shelves Journal of Glaciology Kennedy channel Cambridge University Press Arctic Ellesmere Island Daly ENVELOPE(63.761,63.761,-67.513,-67.513) Kennedy Channel ENVELOPE(-66.139,-66.139,80.919,80.919) Judge Daly Promontory ENVELOPE(-66.993,-66.993,81.252,81.252) Journal of Glaciology 20 83 393 404 |
institution |
Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes England, John Bradley, R. S. Miller, G. H. Former Ice Shelves in the Canadian High Arctic |
topic_facet |
Earth-Surface Processes |
description |
Abstract Moraines deposited by the outermost ice advance across Judge Daly Promontory, northeastern Ellesmere Island, reflect thin, topographically controlled ice lobes extending to sea-level. The termini of two ice lobes were investigated and both produced ice shelves where they flowed into isostatically depressed embayments along western Kennedy Channel. Morphological evidence for these ice shelves occurs at the entrance to these valleys where steeply descending lateral moraines become abruptly horizontal for 2 km. In addition, both the horizontal moraines and associated pro-glacial terraces are fossiliferous down-valley from the apparent grounding line. Based on the differences in elevation between the horizontal moraines and the valley bottoms, the two ice shelves had estimated thicknesses of c . 110 and 150 m. A proglacial outwash terrace at 175 m a.s.l. is considered to represent the approximate relative sea-level during the formation and break-up of the ice shelves. This relative sea-level is consistent with the water depths required to float the calculated ice thicknesses in both valleys. Associated with these ice margins are finite 14 C dates of 28 000-30 000 B.P. and amino-acid age estimates of >35 000 B.P. The importance and likelihood of additional past ice shelves in the Canadian High Arctic is discussed. |
format |
Article in Journal/Newspaper |
author |
England, John Bradley, R. S. Miller, G. H. |
author_facet |
England, John Bradley, R. S. Miller, G. H. |
author_sort |
England, John |
title |
Former Ice Shelves in the Canadian High Arctic |
title_short |
Former Ice Shelves in the Canadian High Arctic |
title_full |
Former Ice Shelves in the Canadian High Arctic |
title_fullStr |
Former Ice Shelves in the Canadian High Arctic |
title_full_unstemmed |
Former Ice Shelves in the Canadian High Arctic |
title_sort |
former ice shelves in the canadian high arctic |
publisher |
Cambridge University Press (CUP) |
publishDate |
1978 |
url |
http://dx.doi.org/10.1017/s0022143000013927 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000013927 |
long_lat |
ENVELOPE(63.761,63.761,-67.513,-67.513) ENVELOPE(-66.139,-66.139,80.919,80.919) ENVELOPE(-66.993,-66.993,81.252,81.252) |
geographic |
Arctic Ellesmere Island Daly Kennedy Channel Judge Daly Promontory |
geographic_facet |
Arctic Ellesmere Island Daly Kennedy Channel Judge Daly Promontory |
genre |
Arctic Ellesmere Island Ice Shelves Journal of Glaciology Kennedy channel |
genre_facet |
Arctic Ellesmere Island Ice Shelves Journal of Glaciology Kennedy channel |
op_source |
Journal of Glaciology volume 20, issue 83, page 393-404 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000013927 |
container_title |
Journal of Glaciology |
container_volume |
20 |
container_issue |
83 |
container_start_page |
393 |
op_container_end_page |
404 |
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1792497352390475776 |