Ice-marginal sedimentation and processes of diamicton deposition in large proglacial lakes, Lake Erie, Ontario, Canada
Detailed studies of coastal cliff exposures through two end moraines form the basis for a model of ice-marginal sedimentation in large ice-contact glacier-fed lakes. The input to the ice-marginal environment directly from the glacier included subglacial till and subaquatic flow tills. The subaquatic...
Published in: | Canadian Journal of Earth Sciences |
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crcansciencepubl:10.1139/cjes-2017-0006 2024-10-13T14:07:29+00:00 Ice-marginal sedimentation and processes of diamicton deposition in large proglacial lakes, Lake Erie, Ontario, Canada Barnett, Peter J. Karrow, Paul F. Sharpe, David 2018 http://dx.doi.org/10.1139/cjes-2017-0006 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2017-0006 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2017-0006 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 55, issue 7, page 846-862 ISSN 0008-4077 1480-3313 journal-article 2018 crcansciencepubl https://doi.org/10.1139/cjes-2017-0006 2024-09-19T04:09:50Z Detailed studies of coastal cliff exposures through two end moraines form the basis for a model of ice-marginal sedimentation in large ice-contact glacier-fed lakes. The input to the ice-marginal environment directly from the glacier included subglacial till and subaquatic flow tills. The subaquatic flow till (thinly bedded diamicton) was deposited in an apron (up to 1 km wide) along the ice margin. An upward gradient of pore-water pressure immediately beyond the ice margin, causing heaving and dilation of the sediments, initiated debris flows of glacially derived debris (subaquatic flow tills). Most of the stratified sediments in the ice-marginal zone entered the lake by way of a large proglacial stream. Sedimentation was dominated by quasi- or near-continuous density underflows that resulted in the deposition of a sequence of thick rhythmites. The glacier in the Lake Erie basin most likely behaved like an ice stream, with its movement controlled predominantly by a deforming bed of glacial debris, separating the glacier sole from underlying predeposited sediments. The deforming bed is preserved as a massive diamicton layer, interpreted here as subglacially deposited till. Article in Journal/Newspaper glacier* Canadian Science Publishing Canada Canadian Journal of Earth Sciences 55 7 846 862 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Detailed studies of coastal cliff exposures through two end moraines form the basis for a model of ice-marginal sedimentation in large ice-contact glacier-fed lakes. The input to the ice-marginal environment directly from the glacier included subglacial till and subaquatic flow tills. The subaquatic flow till (thinly bedded diamicton) was deposited in an apron (up to 1 km wide) along the ice margin. An upward gradient of pore-water pressure immediately beyond the ice margin, causing heaving and dilation of the sediments, initiated debris flows of glacially derived debris (subaquatic flow tills). Most of the stratified sediments in the ice-marginal zone entered the lake by way of a large proglacial stream. Sedimentation was dominated by quasi- or near-continuous density underflows that resulted in the deposition of a sequence of thick rhythmites. The glacier in the Lake Erie basin most likely behaved like an ice stream, with its movement controlled predominantly by a deforming bed of glacial debris, separating the glacier sole from underlying predeposited sediments. The deforming bed is preserved as a massive diamicton layer, interpreted here as subglacially deposited till. |
author2 |
Sharpe, David |
format |
Article in Journal/Newspaper |
author |
Barnett, Peter J. Karrow, Paul F. |
spellingShingle |
Barnett, Peter J. Karrow, Paul F. Ice-marginal sedimentation and processes of diamicton deposition in large proglacial lakes, Lake Erie, Ontario, Canada |
author_facet |
Barnett, Peter J. Karrow, Paul F. |
author_sort |
Barnett, Peter J. |
title |
Ice-marginal sedimentation and processes of diamicton deposition in large proglacial lakes, Lake Erie, Ontario, Canada |
title_short |
Ice-marginal sedimentation and processes of diamicton deposition in large proglacial lakes, Lake Erie, Ontario, Canada |
title_full |
Ice-marginal sedimentation and processes of diamicton deposition in large proglacial lakes, Lake Erie, Ontario, Canada |
title_fullStr |
Ice-marginal sedimentation and processes of diamicton deposition in large proglacial lakes, Lake Erie, Ontario, Canada |
title_full_unstemmed |
Ice-marginal sedimentation and processes of diamicton deposition in large proglacial lakes, Lake Erie, Ontario, Canada |
title_sort |
ice-marginal sedimentation and processes of diamicton deposition in large proglacial lakes, lake erie, ontario, canada |
publisher |
Canadian Science Publishing |
publishDate |
2018 |
url |
http://dx.doi.org/10.1139/cjes-2017-0006 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2017-0006 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2017-0006 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
glacier* |
genre_facet |
glacier* |
op_source |
Canadian Journal of Earth Sciences volume 55, issue 7, page 846-862 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2017-0006 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
55 |
container_issue |
7 |
container_start_page |
846 |
op_container_end_page |
862 |
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1812813794211004416 |