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Glacial Lake Agassiz; a 5000 yr history of change and its relationship to the delta (super 18) O record of Greenland

James T. Teller and David W. Leverington
Glacial Lake Agassiz; a 5000 yr history of change and its relationship to the delta (super 18) O record of Greenland
Geological Society of America Bulletin (June 2004) 116 (5-6): 729-742

Abstract

Lake Agassiz was the largest lake in North America during the last period of deglaciation; the lake extended over a total of 1.5 X 10 (super 6) km (super 2) before it drained at ca. 7.7 (super 14) C ka (8.4 cal. [calendar] ka). New computer reconstructions-controlled by beaches, isostatic rebound data, the margin of the Laurentide Ice Sheet, outlet elevations, and a digital elevation model (DEM) of modern topographic data-show how variable the size and depth of this lake were during its 4000 (super 14) C yr (5000 cal. yr) history. Abrupt reductions in lake level, ranging from 8 to 110 m, occurred on at least 18 occasions when new outlets were opened, reducing the extent of the lake and sending large outbursts of water to the oceans. Three of the largest outbursts correlate closely in time with the start of large delta (super 18) O excursions in the isotopic records of the Greenland ice cap, suggesting that those freshwaters may have had an impact on thermohaline circulation and, in turn, on climate.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 116
Serial Issue: 5-6
Title: Glacial Lake Agassiz; a 5000 yr history of change and its relationship to the delta (super 18) O record of Greenland
Affiliation: University of Manitoba, Department of Geological Sciences, Winnipeg, MB, Canada
Pages: 729-742
Published: 200406
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 87
Accession Number: 2004-054258
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2004079
Illustration Description: illus. incl. 1 table, sketch maps
N60°00'00" - N84°00'00", W70°00'00" - W20°00'00"
Secondary Affiliation: Smithsonian Institution, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200416
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