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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1994
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ftuninhampshire:oai:scholars.unh.edu:ccom_affil-1037 2023-05-15T16:40:47+02:00 Great Lakes paleohydrology: Complex interplay of glacial meltwater, lake levels, and sill depths 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. 1994-12-01T08:00:00Z https://scholars.unh.edu/ccom_affil/38 http://geology.gsapubs.org/content/22/12/1059.abstract unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/ccom_affil/38 http://geology.gsapubs.org/content/22/12/1059.abstract Affiliate Scholarship Geology Paleontology text 1994 ftuninhampshire 2023-01-30T21:32:01Z 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. Text Ice Sheet University of New Hampshire: Scholars Repository Southern Lake ENVELOPE(-94.333,-94.333,62.217,62.217) |
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Open Polar |
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University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
topic |
Geology Paleontology |
spellingShingle |
Geology Paleontology 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. Great Lakes paleohydrology: Complex interplay of glacial meltwater, lake levels, and sill depths |
topic_facet |
Geology Paleontology |
description |
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. |
format |
Text |
author |
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. |
author_facet |
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. |
author_sort |
Rea, David K. |
title |
Great Lakes paleohydrology: Complex interplay of glacial meltwater, lake levels, and sill depths |
title_short |
Great Lakes paleohydrology: Complex interplay of glacial meltwater, lake levels, and sill depths |
title_full |
Great Lakes paleohydrology: Complex interplay of glacial meltwater, lake levels, and sill depths |
title_fullStr |
Great Lakes paleohydrology: Complex interplay of glacial meltwater, lake levels, and sill depths |
title_full_unstemmed |
Great Lakes paleohydrology: Complex interplay of glacial meltwater, lake levels, and sill depths |
title_sort |
great lakes paleohydrology: complex interplay of glacial meltwater, lake levels, and sill depths |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
1994 |
url |
https://scholars.unh.edu/ccom_affil/38 http://geology.gsapubs.org/content/22/12/1059.abstract |
long_lat |
ENVELOPE(-94.333,-94.333,62.217,62.217) |
geographic |
Southern Lake |
geographic_facet |
Southern Lake |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Affiliate Scholarship |
op_relation |
https://scholars.unh.edu/ccom_affil/38 http://geology.gsapubs.org/content/22/12/1059.abstract |
_version_ |
1766031208578285568 |