Correlation of the Campbell strandlines along the northwestern margin of glacial Lake Agassiz
The Upper and Lower Campbell strandlines of glacial Lake Agassiz, were correlated from Dauphin, Manitoba northwestward toward the Clearwater River to determine if Lake Agassiz could have overflowed through a northwestern outlet at the Clearwater River into the Mackenzie River drainage basin. The res...
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1997
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ftunivmanitoba:oai:mspace.lib.umanitoba.ca:1993/1104 2023-06-18T03:41:31+02:00 Correlation of the Campbell strandlines along the northwestern margin of glacial Lake Agassiz Rayburn, John A. 1997-09-01T00:00:00Z 8951577 bytes 184 bytes application/pdf text/plain http://hdl.handle.net/1993/1104 eng eng http://hdl.handle.net/1993/1104 open access master thesis 1997 ftunivmanitoba 2023-06-04T17:44:43Z The Upper and Lower Campbell strandlines of glacial Lake Agassiz, were correlated from Dauphin, Manitoba northwestward toward the Clearwater River to determine if Lake Agassiz could have overflowed through a northwestern outlet at the Clearwater River into the Mackenzie River drainage basin. The results suggest that the Upper Campbell extended only as far as 350 km southeast of the Clearwater River Two lines of evidence suggest that waters of Upper Campbell-level Lake Agassiz were blocked from reaching the northwestern outlet. They are the termination of the Upper Campbell strandline on the northwestern side of the Wapawekka Hills, in north-central Saskatchewan, and a rapid rise in elevation of the Upper Campbell strandline from the southern side of the Hills to the northern side. The Lower Campbell beach, extends farther to the northwest, possibly reaching the northwestern outlet. A high-resolution differential GPS survey along the correlated Campbell strandlines has allowed the construction of isobases across the western side of the Lake Agassiz basin. The new isobase information indicates that there was more post-glacial rebound in the northwestern region than previously estimated. This reconstruction indicates that, immediately following deglaciation, the Clearwater Spillway may have been below the southern outlet of Lake Agassiz, and acted as a temporary outlet for the lake. It is concluded that the northern side of the Wapawekka Hills was the location of the Keewatin ice margin while the lake remained at the Upper Campbell level. Sometime after 9,350 BP, rapid ice retreat in the northwest exposed the northwestern outlet, allowing a rapid lowering of Lake Agassiz, and temporarily halting drainage through the Mississippi River system. Subsequent rapid isostatic rebound in the northwest would have raised the elevation of the northwestern outlet, causing its abandonment and reopening the southern outlet. (Abstract shortened by UMI.) Master Thesis Keewatin Mackenzie river MSpace at the University of Manitoba Clearwater River ENVELOPE(-108.938,-108.938,56.371,56.371) Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Level Lake ENVELOPE(-101.227,-101.227,56.457,56.457) Mackenzie River |
institution |
Open Polar |
collection |
MSpace at the University of Manitoba |
op_collection_id |
ftunivmanitoba |
language |
English |
description |
The Upper and Lower Campbell strandlines of glacial Lake Agassiz, were correlated from Dauphin, Manitoba northwestward toward the Clearwater River to determine if Lake Agassiz could have overflowed through a northwestern outlet at the Clearwater River into the Mackenzie River drainage basin. The results suggest that the Upper Campbell extended only as far as 350 km southeast of the Clearwater River Two lines of evidence suggest that waters of Upper Campbell-level Lake Agassiz were blocked from reaching the northwestern outlet. They are the termination of the Upper Campbell strandline on the northwestern side of the Wapawekka Hills, in north-central Saskatchewan, and a rapid rise in elevation of the Upper Campbell strandline from the southern side of the Hills to the northern side. The Lower Campbell beach, extends farther to the northwest, possibly reaching the northwestern outlet. A high-resolution differential GPS survey along the correlated Campbell strandlines has allowed the construction of isobases across the western side of the Lake Agassiz basin. The new isobase information indicates that there was more post-glacial rebound in the northwestern region than previously estimated. This reconstruction indicates that, immediately following deglaciation, the Clearwater Spillway may have been below the southern outlet of Lake Agassiz, and acted as a temporary outlet for the lake. It is concluded that the northern side of the Wapawekka Hills was the location of the Keewatin ice margin while the lake remained at the Upper Campbell level. Sometime after 9,350 BP, rapid ice retreat in the northwest exposed the northwestern outlet, allowing a rapid lowering of Lake Agassiz, and temporarily halting drainage through the Mississippi River system. Subsequent rapid isostatic rebound in the northwest would have raised the elevation of the northwestern outlet, causing its abandonment and reopening the southern outlet. (Abstract shortened by UMI.) |
format |
Master Thesis |
author |
Rayburn, John A. |
spellingShingle |
Rayburn, John A. Correlation of the Campbell strandlines along the northwestern margin of glacial Lake Agassiz |
author_facet |
Rayburn, John A. |
author_sort |
Rayburn, John A. |
title |
Correlation of the Campbell strandlines along the northwestern margin of glacial Lake Agassiz |
title_short |
Correlation of the Campbell strandlines along the northwestern margin of glacial Lake Agassiz |
title_full |
Correlation of the Campbell strandlines along the northwestern margin of glacial Lake Agassiz |
title_fullStr |
Correlation of the Campbell strandlines along the northwestern margin of glacial Lake Agassiz |
title_full_unstemmed |
Correlation of the Campbell strandlines along the northwestern margin of glacial Lake Agassiz |
title_sort |
correlation of the campbell strandlines along the northwestern margin of glacial lake agassiz |
publishDate |
1997 |
url |
http://hdl.handle.net/1993/1104 |
long_lat |
ENVELOPE(-108.938,-108.938,56.371,56.371) ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(-101.227,-101.227,56.457,56.457) |
geographic |
Clearwater River Glacial Lake Level Lake Mackenzie River |
geographic_facet |
Clearwater River Glacial Lake Level Lake Mackenzie River |
genre |
Keewatin Mackenzie river |
genre_facet |
Keewatin Mackenzie river |
op_relation |
http://hdl.handle.net/1993/1104 |
op_rights |
open access |
_version_ |
1769007146408607744 |