10Be ages of flood deposits west of Lake Nipigon, Ontario: evidence for eastward meltwater drainage during the early Holocene Epoch
The Nipigon channels, located to the west and northwest of Lake Nipigon, Ontario, are thought to have enabled the eastward drainage of meltwater from glacial Lake Agassiz during the last deglaciation. Here we present the first direct ages of flood deposits in two of these channels using 10Be surface...
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ftunivtoronto:oai:localhost:1807/71197 2023-05-15T16:41:31+02:00 10Be ages of flood deposits west of Lake Nipigon, Ontario: evidence for eastward meltwater drainage during the early Holocene Epoch Kelly, Meredith A. Fisher, Timothy G. Lowell, Thomas V. Barnett, Peter J. Schwartz, Roseanne 2016-01-04 http://hdl.handle.net/1807/71197 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2015-0135 unknown NRC Research Press (a division of Canadian Science Publishing) 0008-4077 http://hdl.handle.net/1807/71197 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2015-0135 Article 2016 ftunivtoronto 2020-06-17T11:57:57Z The Nipigon channels, located to the west and northwest of Lake Nipigon, Ontario, are thought to have enabled the eastward drainage of meltwater from glacial Lake Agassiz during the last deglaciation. Here we present the first direct ages of flood deposits in two of these channels using 10Be surface exposure dating. Five 10Be ages of a coarse-grained deposit near the Roaring River in the Kaiashk channel complex indicate deglaciation and cessation of water flow by ~11,070±430 yr. To test for inherited nuclides in boulder samples, we also measured the 10Be concentrations of the undersides of two boulders at the Roaring River site. Five 10Be ages of boulders atop a large bedform near Mundell Lake in the Pillar channel complex indicate deglaciation and cessation of water flow by ~10,770±240 yr. Two 10Be ages of nearby bedrock are slightly younger (10,340±260 and 9,860±270 yr). The 10Be ages from the two sites are statistically indistinguishable and indicate that Laurentide Ice Sheet recession occurred rapidly in the region. We used clast diameters and channel dimensions at the Mundell Lake site to estimate paleo-discharge and evaluate the possibility that meltwater drainage influenced climate conditions. We estimate a large maximum discharge of 119,000–159,000 m3s-1 at the site. However, the timing of meltwater discharge at both Roaring River and Mundell Lake is not contemporaneous with abrupt climate events. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. Article in Journal/Newspaper Ice Sheet University of Toronto: Research Repository T-Space Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Mundell Lake ENVELOPE(-98.125,-98.125,57.801,57.801) Pillar ENVELOPE(166.217,166.217,-77.583,-77.583) The Pillar ENVELOPE(-126.853,-126.853,57.300,57.300) |
institution |
Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
unknown |
description |
The Nipigon channels, located to the west and northwest of Lake Nipigon, Ontario, are thought to have enabled the eastward drainage of meltwater from glacial Lake Agassiz during the last deglaciation. Here we present the first direct ages of flood deposits in two of these channels using 10Be surface exposure dating. Five 10Be ages of a coarse-grained deposit near the Roaring River in the Kaiashk channel complex indicate deglaciation and cessation of water flow by ~11,070±430 yr. To test for inherited nuclides in boulder samples, we also measured the 10Be concentrations of the undersides of two boulders at the Roaring River site. Five 10Be ages of boulders atop a large bedform near Mundell Lake in the Pillar channel complex indicate deglaciation and cessation of water flow by ~10,770±240 yr. Two 10Be ages of nearby bedrock are slightly younger (10,340±260 and 9,860±270 yr). The 10Be ages from the two sites are statistically indistinguishable and indicate that Laurentide Ice Sheet recession occurred rapidly in the region. We used clast diameters and channel dimensions at the Mundell Lake site to estimate paleo-discharge and evaluate the possibility that meltwater drainage influenced climate conditions. We estimate a large maximum discharge of 119,000–159,000 m3s-1 at the site. However, the timing of meltwater discharge at both Roaring River and Mundell Lake is not contemporaneous with abrupt climate events. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. |
format |
Article in Journal/Newspaper |
author |
Kelly, Meredith A. Fisher, Timothy G. Lowell, Thomas V. Barnett, Peter J. Schwartz, Roseanne |
spellingShingle |
Kelly, Meredith A. Fisher, Timothy G. Lowell, Thomas V. Barnett, Peter J. Schwartz, Roseanne 10Be ages of flood deposits west of Lake Nipigon, Ontario: evidence for eastward meltwater drainage during the early Holocene Epoch |
author_facet |
Kelly, Meredith A. Fisher, Timothy G. Lowell, Thomas V. Barnett, Peter J. Schwartz, Roseanne |
author_sort |
Kelly, Meredith A. |
title |
10Be ages of flood deposits west of Lake Nipigon, Ontario: evidence for eastward meltwater drainage during the early Holocene Epoch |
title_short |
10Be ages of flood deposits west of Lake Nipigon, Ontario: evidence for eastward meltwater drainage during the early Holocene Epoch |
title_full |
10Be ages of flood deposits west of Lake Nipigon, Ontario: evidence for eastward meltwater drainage during the early Holocene Epoch |
title_fullStr |
10Be ages of flood deposits west of Lake Nipigon, Ontario: evidence for eastward meltwater drainage during the early Holocene Epoch |
title_full_unstemmed |
10Be ages of flood deposits west of Lake Nipigon, Ontario: evidence for eastward meltwater drainage during the early Holocene Epoch |
title_sort |
10be ages of flood deposits west of lake nipigon, ontario: evidence for eastward meltwater drainage during the early holocene epoch |
publisher |
NRC Research Press (a division of Canadian Science Publishing) |
publishDate |
2016 |
url |
http://hdl.handle.net/1807/71197 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2015-0135 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(-98.125,-98.125,57.801,57.801) ENVELOPE(166.217,166.217,-77.583,-77.583) ENVELOPE(-126.853,-126.853,57.300,57.300) |
geographic |
Glacial Lake Mundell Lake Pillar The Pillar |
geographic_facet |
Glacial Lake Mundell Lake Pillar The Pillar |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
0008-4077 http://hdl.handle.net/1807/71197 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2015-0135 |
_version_ |
1766031958685515776 |