A postglacial record of climate change from East Crooked Lake and Tofte Lake, Minnesota.
2010-09
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A postglacial record of climate change from East Crooked Lake and Tofte Lake, Minnesota.
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2010-09
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Abstract
The postglacial Holocene climate history of Minnesota is characterized by a cool
postglacial period beginning about 10 ka and lasting until about 8 ka when dryer
conditions ushered in a Prairie Period which lasted until about 4 ka at which time
moisture increased. From about 4 ka to the present climate conditions have remained
relatively stable. This history of Minnesota climate has been observed by Dean and
colleagues in numerous studies at Elk Lake, Minnesota. In these studies the researchers
looked at pollen, geochemistry, diatoms, magnetic properties, and isotopes.
This study uses sediment cores from nearby East Crooked Lake to see if scanning
X-ray fluorescence results are comparable to classic inorganic geochemistry results from
Dean at Elk Lake. A sediment core from Tofte Lake near Ely, MN is also compared to
see if the results from Elk Lake and East Crooked Lake are regional in extent.
The results confirm that scanning XRF is comparable to the classic, time
consuming geochemistry methods used by Dean at Elk Lake and that the postglacial
Holocene history recorded at Elk Lake was also recorded at East Crooked Lake. The
timing of events at Elk Lake and East Crooked Lake are adjusted to correlate with the
more accurate dating of events at Steel Lake, MN. The findings do not support that the
climate events at Elk Lake and East Crooked Lake are regional in their extent to Tofte Lake. Tofte Lake did not experience a dryer Prairie Period.
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University of Minnesota M.S. thesis. September 2010. Major: Geological Sciences. Advisor: Thomas C. Johnson. 1 computer file (PDF); v, 47 pages, appendix I.
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Wendt, Kelly Michael. (2010). A postglacial record of climate change from East Crooked Lake and Tofte Lake, Minnesota.. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/102788.
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