The extent of ice on the continental shelf off Hudson Strait during Heinrich events 1-3
North Atlantic Heinrich events, which dispersed widespread sediment plumes and icebergs, originated principally from Hudson Strait ice streams of the Laurentide Ice Sheet. The dynamics and extent of these ice streams across the wide continental shelf seaward of Hudson Strait are not well understood....
Published in: | Canadian Journal of Earth Sciences |
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Online Access: | http://dx.doi.org/10.1139/e07-051 http://www.nrcresearchpress.com/doi/pdf/10.1139/e07-051 |
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crcansciencepubl:10.1139/e07-051 2024-06-23T07:53:34+00:00 The extent of ice on the continental shelf off Hudson Strait during Heinrich events 1-3 Rashid, Harunur Piper, David JW 2007 http://dx.doi.org/10.1139/e07-051 http://www.nrcresearchpress.com/doi/pdf/10.1139/e07-051 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 44, issue 11, page 1537-1549 ISSN 0008-4077 1480-3313 journal-article 2007 crcansciencepubl https://doi.org/10.1139/e07-051 2024-06-06T04:11:18Z North Atlantic Heinrich events, which dispersed widespread sediment plumes and icebergs, originated principally from Hudson Strait ice streams of the Laurentide Ice Sheet. The dynamics and extent of these ice streams across the wide continental shelf seaward of Hudson Strait are not well understood. High-resolution airgun seismic reflection profiles from the outer shelf and slope show an acoustically incoherent, prograded unit at least 30 m thick. This unit has been sampled by piston cores and corresponds to a carbonate-rich diamicton unit interpreted as a glacigenic debris flow, locally overlain by carbonate-rich mud turbidites, dated as corresponding to Heinrich event 3 (H3). Younger glacigenic debris flow deposits are lacking. These data are compared with the seismic-stratigraphic record on the continental shelf, where a regional erosion surface at 10–200 m depth below the sea floor truncates Tertiary strata and is overlain by a 50 m thick diamicton (?subglacial till) sheet and is correlated with the H3 glacigenic debris flows. Above this unit, at least two distinct diamicton sheets terminate on the inner continental shelf. These data imply that grounded Laurentide ice crossed the continental shelf during H3, delivering large amounts of diamicton to the continental slope, but during the younger Heinrich events H1 and H2, no detectable record of diamicton was left on the outer shelf or slope. These findings account for observed differences between H3 and younger Heinrich events in the Labrador Sea. Article in Journal/Newspaper Hudson Strait Ice Sheet Labrador Sea North Atlantic Canadian Science Publishing Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Canadian Journal of Earth Sciences 44 11 1537 1549 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
North Atlantic Heinrich events, which dispersed widespread sediment plumes and icebergs, originated principally from Hudson Strait ice streams of the Laurentide Ice Sheet. The dynamics and extent of these ice streams across the wide continental shelf seaward of Hudson Strait are not well understood. High-resolution airgun seismic reflection profiles from the outer shelf and slope show an acoustically incoherent, prograded unit at least 30 m thick. This unit has been sampled by piston cores and corresponds to a carbonate-rich diamicton unit interpreted as a glacigenic debris flow, locally overlain by carbonate-rich mud turbidites, dated as corresponding to Heinrich event 3 (H3). Younger glacigenic debris flow deposits are lacking. These data are compared with the seismic-stratigraphic record on the continental shelf, where a regional erosion surface at 10–200 m depth below the sea floor truncates Tertiary strata and is overlain by a 50 m thick diamicton (?subglacial till) sheet and is correlated with the H3 glacigenic debris flows. Above this unit, at least two distinct diamicton sheets terminate on the inner continental shelf. These data imply that grounded Laurentide ice crossed the continental shelf during H3, delivering large amounts of diamicton to the continental slope, but during the younger Heinrich events H1 and H2, no detectable record of diamicton was left on the outer shelf or slope. These findings account for observed differences between H3 and younger Heinrich events in the Labrador Sea. |
format |
Article in Journal/Newspaper |
author |
Rashid, Harunur Piper, David JW |
spellingShingle |
Rashid, Harunur Piper, David JW The extent of ice on the continental shelf off Hudson Strait during Heinrich events 1-3 |
author_facet |
Rashid, Harunur Piper, David JW |
author_sort |
Rashid, Harunur |
title |
The extent of ice on the continental shelf off Hudson Strait during Heinrich events 1-3 |
title_short |
The extent of ice on the continental shelf off Hudson Strait during Heinrich events 1-3 |
title_full |
The extent of ice on the continental shelf off Hudson Strait during Heinrich events 1-3 |
title_fullStr |
The extent of ice on the continental shelf off Hudson Strait during Heinrich events 1-3 |
title_full_unstemmed |
The extent of ice on the continental shelf off Hudson Strait during Heinrich events 1-3 |
title_sort |
extent of ice on the continental shelf off hudson strait during heinrich events 1-3 |
publisher |
Canadian Science Publishing |
publishDate |
2007 |
url |
http://dx.doi.org/10.1139/e07-051 http://www.nrcresearchpress.com/doi/pdf/10.1139/e07-051 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Hudson Hudson Strait |
geographic_facet |
Hudson Hudson Strait |
genre |
Hudson Strait Ice Sheet Labrador Sea North Atlantic |
genre_facet |
Hudson Strait Ice Sheet Labrador Sea North Atlantic |
op_source |
Canadian Journal of Earth Sciences volume 44, issue 11, page 1537-1549 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e07-051 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
44 |
container_issue |
11 |
container_start_page |
1537 |
op_container_end_page |
1549 |
_version_ |
1802645300985200640 |