Holocene delevelling of Devon Island, Arctic Canada: implications for ice sheet geometry and crustal response
The raised beaches and deltas of Devon Island contain an abundance of dateable materials. A large set of radiocarbon dates (228), 154 of which are new, are used to construct relative sea level curves and isobase maps for the island. The best materials for this purpose are driftwood logs (61 dates) a...
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1998
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Online Access: | http://dx.doi.org/10.1139/e98-034 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-034 |
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crcansciencepubl:10.1139/e98-034 2024-04-07T07:50:36+00:00 Holocene delevelling of Devon Island, Arctic Canada: implications for ice sheet geometry and crustal response Dyke, Arthur S 1998 http://dx.doi.org/10.1139/e98-034 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-034 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 35, issue 8, page 885-904 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1998 crcansciencepubl https://doi.org/10.1139/e98-034 2024-03-08T00:37:30Z The raised beaches and deltas of Devon Island contain an abundance of dateable materials. A large set of radiocarbon dates (228), 154 of which are new, are used to construct relative sea level curves and isobase maps for the island. The best materials for this purpose are driftwood logs (61 dates) and bowhead whale bones (74 dates) from raised beaches and mollusc shells from marine-limit deltas (20 dates) or from altitudes close to marine limit (14 dates). During the last glacial maximum, the island is thought to have lain beneath the southeastern flank of the Innuitian Ice Sheet. The relative sea level history is congruent with that inferred ice configuration. The island spans half the ice sheet width. Relative sea level curves are of simple exponential form, except near the glacial limit where an early Holocene emergence proceeded to a middle Holocene lowstand below present sea level, which was followed by submergence attending the passage of the crustal forebulge. The response times of relative sea level curves and of crustal uplift decrease from the uplift centre toward the limit of loading, but the change appears strongest near the limit. The Innuitian uplift is separated from the Laurentide uplift to the south by a strong isobase embayment over Lancaster Sound. Hence, ice load irregularities with wavelengths of about 100 km were large enough to leave an isostatic thumbprint in this region of the continent. The apparent absence of a similar embayment over Jones Sound probably indicates a greater Late Wisconsinan ice load there, or a thicker crust than in Lancaster Sound. Article in Journal/Newspaper Arctic bowhead whale Devon Island Ice Sheet Lancaster Sound Canadian Science Publishing Arctic Canada Devon Island ENVELOPE(-88.000,-88.000,75.252,75.252) Lancaster Sound ENVELOPE(-83.999,-83.999,74.218,74.218) Jones Sound ENVELOPE(-86.000,-86.000,76.002,76.002) Canadian Journal of Earth Sciences 35 8 885 904 |
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Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Dyke, Arthur S Holocene delevelling of Devon Island, Arctic Canada: implications for ice sheet geometry and crustal response |
topic_facet |
General Earth and Planetary Sciences |
description |
The raised beaches and deltas of Devon Island contain an abundance of dateable materials. A large set of radiocarbon dates (228), 154 of which are new, are used to construct relative sea level curves and isobase maps for the island. The best materials for this purpose are driftwood logs (61 dates) and bowhead whale bones (74 dates) from raised beaches and mollusc shells from marine-limit deltas (20 dates) or from altitudes close to marine limit (14 dates). During the last glacial maximum, the island is thought to have lain beneath the southeastern flank of the Innuitian Ice Sheet. The relative sea level history is congruent with that inferred ice configuration. The island spans half the ice sheet width. Relative sea level curves are of simple exponential form, except near the glacial limit where an early Holocene emergence proceeded to a middle Holocene lowstand below present sea level, which was followed by submergence attending the passage of the crustal forebulge. The response times of relative sea level curves and of crustal uplift decrease from the uplift centre toward the limit of loading, but the change appears strongest near the limit. The Innuitian uplift is separated from the Laurentide uplift to the south by a strong isobase embayment over Lancaster Sound. Hence, ice load irregularities with wavelengths of about 100 km were large enough to leave an isostatic thumbprint in this region of the continent. The apparent absence of a similar embayment over Jones Sound probably indicates a greater Late Wisconsinan ice load there, or a thicker crust than in Lancaster Sound. |
format |
Article in Journal/Newspaper |
author |
Dyke, Arthur S |
author_facet |
Dyke, Arthur S |
author_sort |
Dyke, Arthur S |
title |
Holocene delevelling of Devon Island, Arctic Canada: implications for ice sheet geometry and crustal response |
title_short |
Holocene delevelling of Devon Island, Arctic Canada: implications for ice sheet geometry and crustal response |
title_full |
Holocene delevelling of Devon Island, Arctic Canada: implications for ice sheet geometry and crustal response |
title_fullStr |
Holocene delevelling of Devon Island, Arctic Canada: implications for ice sheet geometry and crustal response |
title_full_unstemmed |
Holocene delevelling of Devon Island, Arctic Canada: implications for ice sheet geometry and crustal response |
title_sort |
holocene delevelling of devon island, arctic canada: implications for ice sheet geometry and crustal response |
publisher |
Canadian Science Publishing |
publishDate |
1998 |
url |
http://dx.doi.org/10.1139/e98-034 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-034 |
long_lat |
ENVELOPE(-88.000,-88.000,75.252,75.252) ENVELOPE(-83.999,-83.999,74.218,74.218) ENVELOPE(-86.000,-86.000,76.002,76.002) |
geographic |
Arctic Canada Devon Island Lancaster Sound Jones Sound |
geographic_facet |
Arctic Canada Devon Island Lancaster Sound Jones Sound |
genre |
Arctic bowhead whale Devon Island Ice Sheet Lancaster Sound |
genre_facet |
Arctic bowhead whale Devon Island Ice Sheet Lancaster Sound |
op_source |
Canadian Journal of Earth Sciences volume 35, issue 8, page 885-904 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e98-034 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
35 |
container_issue |
8 |
container_start_page |
885 |
op_container_end_page |
904 |
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1795665334638739456 |