Great Lakes paleohydrology: Complex interplay of glacial meltwater, lake levels, and sill depths

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 G...

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Bibliographic Details
Main Authors: Rea, David K., Moore, Ted C., Jr, Anderson, Thane W., Lewis, C.F. M., Dobson, David M., Dettman, David L., Smith, Alison J., Mayer, Larry A.
Format: Text
Language:unknown
Published: University of New Hampshire Scholars' Repository 1994
Subjects:
Geology
Paleontology
Southern Lake
Ice Sheet
Online Access:https://scholars.unh.edu/ccom_affil/38
http://geology.gsapubs.org/content/22/12/1059.abstract
Description
Summary: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 (δ18O values of -20‰ to -22‰ 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.

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