Glacial geology and Quaternary marine stratigraphy of the Robeson Channel area, northeastern Ellesmere Island, Northwest Territories
Glacial and marine deposits associated with two phases of glaciation are exposed along a 60 km corridor on Ellesmere Island that borders Robeson Channel. The oldest sediments, tentatively dated at ≥ 70 000 BP, were deposited during a major advance of the northwest Greenland ice sheet across Robeson...
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crcansciencepubl:10.1139/e86-101 2023-12-17T10:25:45+01:00 Glacial geology and Quaternary marine stratigraphy of the Robeson Channel area, northeastern Ellesmere Island, Northwest Territories Retelle, Michael J. 1986 http://dx.doi.org/10.1139/e86-101 http://www.nrcresearchpress.com/doi/pdf/10.1139/e86-101 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 23, issue 7, page 1001-1012 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1986 crcansciencepubl https://doi.org/10.1139/e86-101 2023-11-19T13:38:44Z Glacial and marine deposits associated with two phases of glaciation are exposed along a 60 km corridor on Ellesmere Island that borders Robeson Channel. The oldest sediments, tentatively dated at ≥ 70 000 BP, were deposited during a major advance of the northwest Greenland ice sheet across Robeson Channel. During subsequent retreat of this ice mass, glaciomarine sediments containing a High Arctic macro- and microfauna were deposited in the isostatic downwarp on Ellesmere Island. This marine unit was radiocarbon dated at 31 300 ± 900 and > 32 000 BP; mean aIle/Ile ratios are 0.218 ± 0.03 for the free fraction and 0.063 ± 0.011 for the total acid hydrolysate.The last ice advance (late Wisconsin – early Holocene) did not extend into the field area from either interior Ellesmere Island or northwest Greenland. The ice-marginal sea transgressed to the marine limit (~116 m) and overlapped the deposits of the previous maximum Greenland advance. Local plateau ice caps did, however, spill over into one major valley and delayed the establishment of the marine limit in this location. Radiocarbon dates on the Holocene marine limit shorelines indicate initial emergence between 8000 and 8600 BP. A mean aIle/Ile ratio of 0.037 was found for the total acid hydrolysate; aIle was undetectable in the free fraction of the Holocene shells.The Holocene and pre-Holocene glacial and marine chronologies in the Robeson Channel area are similar to chronologies demonstrated from other locations in Arctic regions. Tentative correlations based upon aminostratigraphy suggest that the field area has remained, for the most part, ice free since at least 70 000 BP. Article in Journal/Newspaper Arctic Ellesmere Island Greenland Ice Sheet Northwest Territories Robeson channel Canadian Science Publishing (via Crossref) Arctic Northwest Territories Ellesmere Island Greenland Robeson Channel ENVELOPE(-61.473,-61.473,81.995,81.995) Canadian Journal of Earth Sciences 23 7 1001 1012 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Retelle, Michael J. Glacial geology and Quaternary marine stratigraphy of the Robeson Channel area, northeastern Ellesmere Island, Northwest Territories |
topic_facet |
General Earth and Planetary Sciences |
description |
Glacial and marine deposits associated with two phases of glaciation are exposed along a 60 km corridor on Ellesmere Island that borders Robeson Channel. The oldest sediments, tentatively dated at ≥ 70 000 BP, were deposited during a major advance of the northwest Greenland ice sheet across Robeson Channel. During subsequent retreat of this ice mass, glaciomarine sediments containing a High Arctic macro- and microfauna were deposited in the isostatic downwarp on Ellesmere Island. This marine unit was radiocarbon dated at 31 300 ± 900 and > 32 000 BP; mean aIle/Ile ratios are 0.218 ± 0.03 for the free fraction and 0.063 ± 0.011 for the total acid hydrolysate.The last ice advance (late Wisconsin – early Holocene) did not extend into the field area from either interior Ellesmere Island or northwest Greenland. The ice-marginal sea transgressed to the marine limit (~116 m) and overlapped the deposits of the previous maximum Greenland advance. Local plateau ice caps did, however, spill over into one major valley and delayed the establishment of the marine limit in this location. Radiocarbon dates on the Holocene marine limit shorelines indicate initial emergence between 8000 and 8600 BP. A mean aIle/Ile ratio of 0.037 was found for the total acid hydrolysate; aIle was undetectable in the free fraction of the Holocene shells.The Holocene and pre-Holocene glacial and marine chronologies in the Robeson Channel area are similar to chronologies demonstrated from other locations in Arctic regions. Tentative correlations based upon aminostratigraphy suggest that the field area has remained, for the most part, ice free since at least 70 000 BP. |
format |
Article in Journal/Newspaper |
author |
Retelle, Michael J. |
author_facet |
Retelle, Michael J. |
author_sort |
Retelle, Michael J. |
title |
Glacial geology and Quaternary marine stratigraphy of the Robeson Channel area, northeastern Ellesmere Island, Northwest Territories |
title_short |
Glacial geology and Quaternary marine stratigraphy of the Robeson Channel area, northeastern Ellesmere Island, Northwest Territories |
title_full |
Glacial geology and Quaternary marine stratigraphy of the Robeson Channel area, northeastern Ellesmere Island, Northwest Territories |
title_fullStr |
Glacial geology and Quaternary marine stratigraphy of the Robeson Channel area, northeastern Ellesmere Island, Northwest Territories |
title_full_unstemmed |
Glacial geology and Quaternary marine stratigraphy of the Robeson Channel area, northeastern Ellesmere Island, Northwest Territories |
title_sort |
glacial geology and quaternary marine stratigraphy of the robeson channel area, northeastern ellesmere island, northwest territories |
publisher |
Canadian Science Publishing |
publishDate |
1986 |
url |
http://dx.doi.org/10.1139/e86-101 http://www.nrcresearchpress.com/doi/pdf/10.1139/e86-101 |
long_lat |
ENVELOPE(-61.473,-61.473,81.995,81.995) |
geographic |
Arctic Northwest Territories Ellesmere Island Greenland Robeson Channel |
geographic_facet |
Arctic Northwest Territories Ellesmere Island Greenland Robeson Channel |
genre |
Arctic Ellesmere Island Greenland Ice Sheet Northwest Territories Robeson channel |
genre_facet |
Arctic Ellesmere Island Greenland Ice Sheet Northwest Territories Robeson channel |
op_source |
Canadian Journal of Earth Sciences volume 23, issue 7, page 1001-1012 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e86-101 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
23 |
container_issue |
7 |
container_start_page |
1001 |
op_container_end_page |
1012 |
_version_ |
1785577405091414016 |