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January 24, 2010 | History

Depositional record of late Wisconsin Glacial Lake Mackenzie, Northwest Territories, Canada: Implications for permafrost degradation in a warming climate 1 edition

Depositional record of late Wisconsin Glacial Lake Mackenzie, Northwes ...
Andrew G. Couch

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Depositional record of late Wisconsin Glacial Lake Mackenzie, Northwest Territories, Canada: Implications for permafrost degradation in a warming climate.

Published 2006 .
Written in English.

About the Book

In the Northwest Territories of Canada, Glacial Lake Mackenzie developed as the Laurentide Ice sheet retreated away from the Cordillera sometime after 10, 000 14C ybp. Glaciolacustrine deposits of Lake Mackenzie extend over some 21, 000 km2 of the Mackenzie Valley. Detailed sedimentological study of large outcrops created by postglacial fluvial down cutting through glacial sediments in a 11 250 km2 area of the basin reveals the depositional history of Glacial Lake Mackenzie. A regionally extensive till sheet provides a stratigraphic marker throughout the basin recording the maximum extent of the Laurentide Ice Sheet sometime between and 35, 000 and 22, 000 14C ybp. The overlying glaciolacustrine basin fill can be divided into six facies associations.Integration of outcrop and map data shows that parent glacial sedimentary facies closely control the distribution of permafrost. In particular, the widespread presences of wet, fine-grained mud facies promoted the growth of ground ice when exposed by lake drainage. There is an excellent spatial relationship between glaciolacustrine mud facies and thaw lakes that identify terrain subsidence that was initiated by the melting of permafrost during a period of mid-Holocene warming. Unconventional gas reservoirs likely exist in the Glacial Lake Mackenzie basin given the presence of coal-bearing Mesozoic source rock strata and coarse-grained reservoir fan-delta deposits preserved below thick and extensive glaciolacustrine muds.

Edition Notes

Source: Masters Abstracts International, Volume: 44-06, page: 2732.

Thesis (M.A.Sc.)--University of Toronto, 2006.

Electronic version licensed for access by U. of T. users.

ROBARTS MICROTEXT copy on microfiche.

The Physical Object

Pagination
53 leaves.
Number of pages
53

ID Numbers

Open Library
OL19215017M
ISBN 13
9780494161418

History Created December 11, 2009 · 2 revisions Download catalog record: RDF / JSON

January 24, 2010 Edited by WorkBot add more information to works
December 11, 2009 Created by WorkBot add works page