Glacial-Lake Outburst Erosion of the Grand Valley, Michigan, and Impacts on Glacial Lakes in the Lake Michigan Basin
Abstract Geomorphic and sedimentologic evidence in the Grand Valley, which drained the retreating Saginaw Lobe of the Laurentide Ice Sheet and later acted as a spillway between lakes in the Huron and Erie basins and in the Michigan basin, suggests that at least one drainage event from glacial Lake S...
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Cambridge University Press (CUP)
1993
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crcambridgeupr:10.1006/qres.1993.1004 2024-09-15T18:12:28+00:00 Glacial-Lake Outburst Erosion of the Grand Valley, Michigan, and Impacts on Glacial Lakes in the Lake Michigan Basin Kehew, Alan E. 1993 http://dx.doi.org/10.1006/qres.1993.1004 http://api.elsevier.com/content/article/PII:S0033589483710045?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589483710045?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940003413X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 39, issue 1, page 36-44 ISSN 0033-5894 1096-0287 journal-article 1993 crcambridgeupr https://doi.org/10.1006/qres.1993.1004 2024-08-28T04:03:08Z Abstract Geomorphic and sedimentologic evidence in the Grand Valley, which drained the retreating Saginaw Lobe of the Laurentide Ice Sheet and later acted as a spillway between lakes in the Huron and Erie basins and in the Michigan basin, suggests that at least one drainage event from glacial Lake Saginaw to glacial Lake Chicago was a catastrophic outburst that deeply incised the valley. Analysis of shoreline and outlet geomorphology at the Chicago outlet supports J H Bretz's hypothesis of episodic incision and lake-level change. Shoreline features of each lake level converge to separate outlet sills that decrease in elevation from the oldest to youngest lake phases. This evidence, coupled with the presence of boulder lags and other features consistent with outburst origin, suggests that the outlets were deepened by catastrophic outbursts at least twice. The first incision event is correlated with a linked series of floods that progressed from Huron and Erie basin lakes to glacial Lake Saginaw to glacial Lake Chicago and then to the Mississippi. The second downcutting event occurred after the Two Rivers Advance of the Lake Michigan Lobe. Outbursts from the eastern outlets of glacial Lake Agassiz to glacial Lake Algonquin are a possible cause for this period of downcutting at the Chicago outlets. Article in Journal/Newspaper Ice Sheet Cambridge University Press Quaternary Research 39 1 36 44 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Geomorphic and sedimentologic evidence in the Grand Valley, which drained the retreating Saginaw Lobe of the Laurentide Ice Sheet and later acted as a spillway between lakes in the Huron and Erie basins and in the Michigan basin, suggests that at least one drainage event from glacial Lake Saginaw to glacial Lake Chicago was a catastrophic outburst that deeply incised the valley. Analysis of shoreline and outlet geomorphology at the Chicago outlet supports J H Bretz's hypothesis of episodic incision and lake-level change. Shoreline features of each lake level converge to separate outlet sills that decrease in elevation from the oldest to youngest lake phases. This evidence, coupled with the presence of boulder lags and other features consistent with outburst origin, suggests that the outlets were deepened by catastrophic outbursts at least twice. The first incision event is correlated with a linked series of floods that progressed from Huron and Erie basin lakes to glacial Lake Saginaw to glacial Lake Chicago and then to the Mississippi. The second downcutting event occurred after the Two Rivers Advance of the Lake Michigan Lobe. Outbursts from the eastern outlets of glacial Lake Agassiz to glacial Lake Algonquin are a possible cause for this period of downcutting at the Chicago outlets. |
format |
Article in Journal/Newspaper |
author |
Kehew, Alan E. |
spellingShingle |
Kehew, Alan E. Glacial-Lake Outburst Erosion of the Grand Valley, Michigan, and Impacts on Glacial Lakes in the Lake Michigan Basin |
author_facet |
Kehew, Alan E. |
author_sort |
Kehew, Alan E. |
title |
Glacial-Lake Outburst Erosion of the Grand Valley, Michigan, and Impacts on Glacial Lakes in the Lake Michigan Basin |
title_short |
Glacial-Lake Outburst Erosion of the Grand Valley, Michigan, and Impacts on Glacial Lakes in the Lake Michigan Basin |
title_full |
Glacial-Lake Outburst Erosion of the Grand Valley, Michigan, and Impacts on Glacial Lakes in the Lake Michigan Basin |
title_fullStr |
Glacial-Lake Outburst Erosion of the Grand Valley, Michigan, and Impacts on Glacial Lakes in the Lake Michigan Basin |
title_full_unstemmed |
Glacial-Lake Outburst Erosion of the Grand Valley, Michigan, and Impacts on Glacial Lakes in the Lake Michigan Basin |
title_sort |
glacial-lake outburst erosion of the grand valley, michigan, and impacts on glacial lakes in the lake michigan basin |
publisher |
Cambridge University Press (CUP) |
publishDate |
1993 |
url |
http://dx.doi.org/10.1006/qres.1993.1004 http://api.elsevier.com/content/article/PII:S0033589483710045?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589483710045?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940003413X |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Quaternary Research volume 39, issue 1, page 36-44 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.1993.1004 |
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Quaternary Research |
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39 |
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1 |
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36 |
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44 |
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1810450051956211712 |