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 isosta...
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ftunivmassamh:oai:works.bepress.com:raymond_bradley-1083 2023-05-15T14:57:50+02:00 Former Ice Shelves in the Canadian High Arctic England, John Bradley, Raymond S Miller, G. H. 1978-01-01T08:00:00Z application/pdf https://works.bepress.com/raymond_bradley/42 https://works.bepress.com/cgi/viewcontent.cgi?article=1083&context=raymond_bradley unknown SelectedWorks https://works.bepress.com/raymond_bradley/42 https://works.bepress.com/cgi/viewcontent.cgi?article=1083&context=raymond_bradley Raymond S Bradley Earth Sciences text 1978 ftunivmassamh 2022-01-09T20:35:35Z 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 downvalley 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 14C 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. Text Arctic Ellesmere Island Ice Shelves Kennedy channel University of Massachusetts: ScholarWorks@UMass Amherst Arctic Daly ENVELOPE(63.761,63.761,-67.513,-67.513) Ellesmere Island Judge Daly Promontory ENVELOPE(-66.993,-66.993,81.252,81.252) Kennedy Channel ENVELOPE(-66.139,-66.139,80.919,80.919) |
institution |
Open Polar |
collection |
University of Massachusetts: ScholarWorks@UMass Amherst |
op_collection_id |
ftunivmassamh |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences England, John Bradley, Raymond S Miller, G. H. Former Ice Shelves in the Canadian High Arctic |
topic_facet |
Earth Sciences |
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 downvalley 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 14C 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 |
Text |
author |
England, John Bradley, Raymond S Miller, G. H. |
author_facet |
England, John Bradley, Raymond 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 |
SelectedWorks |
publishDate |
1978 |
url |
https://works.bepress.com/raymond_bradley/42 https://works.bepress.com/cgi/viewcontent.cgi?article=1083&context=raymond_bradley |
long_lat |
ENVELOPE(63.761,63.761,-67.513,-67.513) ENVELOPE(-66.993,-66.993,81.252,81.252) ENVELOPE(-66.139,-66.139,80.919,80.919) |
geographic |
Arctic Daly Ellesmere Island Judge Daly Promontory Kennedy Channel |
geographic_facet |
Arctic Daly Ellesmere Island Judge Daly Promontory Kennedy Channel |
genre |
Arctic Ellesmere Island Ice Shelves Kennedy channel |
genre_facet |
Arctic Ellesmere Island Ice Shelves Kennedy channel |
op_source |
Raymond S Bradley |
op_relation |
https://works.bepress.com/raymond_bradley/42 https://works.bepress.com/cgi/viewcontent.cgi?article=1083&context=raymond_bradley |
_version_ |
1766329937143267328 |