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GEOREF RECORD

Great Lakes paleohydrology; complex interplay of glacial meltwater, lake levels, and sill depths

David K. Rea, Theodore C. Moore, Thane W. Anderson, C. F. Michael Lewis, David M. Dobson, David L. Dettman, Alison J. Smith and Larry A. Mayer
Great Lakes paleohydrology; complex interplay of glacial meltwater, lake levels, and sill depths
Geology (Boulder) (December 1994) 22 (12): 1059-1062

Abstract

The oxygen isotope record of ostracode and clam shells recovered from Great Lakes cores of known age allows definition of times when meltwaters from the Laurentide ice sheet were important components of lake water in the several lake basins since 12 ka. We find that the lowstands in Lake Huron and Georgian Bay are characterized by isotopically light waters (delta (super 18) O values of -20 per mil to -22 per mil relative to SMOW [standard mean ocean water]) and the highstands by isotopically heavy waters of more local origin. These data can be used to determine the degree of hydraulic separation among the early Holocene lakes. Southern Lake Michigan, for instance, may mix with northern-source waters only during times of rising and high water levels. Generally it is characterized by waters of local origin.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 22
Serial Issue: 12
Title: Great Lakes paleohydrology; complex interplay of glacial meltwater, lake levels, and sill depths
Affiliation: University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States
Pages: 1059-1062
Published: 199412
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 16
Accession Number: 1994-050910
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Geol. Surv. Can., Contrib. No. 36994
Illustration Description: illus. incl. sketch map
N43°00'00" - N46°30'00", W84°45'00" - W79°40'00"
N41°34'60" - N46°10'00", W88°00'00" - W84°45'00"
Secondary Affiliation: Geological Survey of Canada, CAN, CanadaKent State University, USA, United StatesUniversity of New Brunswick, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199423
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