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Chronology and provenance of last-glacial (peoria) loess in western iowa and paleoclimatic implications

Published online by Cambridge University Press:  20 January 2017

Daniel R. Muhs ,
E. Arthur Bettis III ,
Helen M. Roberts ,
Stephen S. Harlan ,
James B. Paces  and
Richard L. Reynolds
Daniel R. Muhs*
Affiliation:
U.S. Geological Survey, MS 980, Box 25046, Federal Center, Denver, CO 80225, USA
E. Arthur Bettis III
Affiliation:
Department of Geoscience, University of Iowa, Iowa City, IA 52242, USA
Helen M. Roberts
Affiliation:
Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, Wales SY23 3DB, United Kingdom
Stephen S. Harlan
Affiliation:
National Science Foundation, 4201 Wilson Blvd., Arlington, VA 22230, USA
James B. Paces
Affiliation:
U.S. Geological Survey, MS 980, Box 25046, Federal Center, Denver, CO 80225, USA
Richard L. Reynolds
Affiliation:
U.S. Geological Survey, MS 980, Box 25046, Federal Center, Denver, CO 80225, USA
*
*Corresponding author. E-mail address:dmuhs@usgs.gov (D.R. Muhs).
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Abstract

Geologic archives show that the Earth was dustier during the last glacial period. One model suggests that increased gustiness (stronger, more frequent winds) enhanced dustiness. We tested this at Loveland, Iowa, one of the thickest deposits of last-glacial-age (Peoria) loess in the world. Based on K/Rb and Ba/Rb, loess was derived not only from glaciogenic sources of the Missouri River, but also distal loess from non-glacial sources in Nebraska. Optically stimulated luminescence (OSL) ages provide the first detailed chronology of Peoria Loess at Loveland. Deposition began after ~ 27 ka and continued until ~ 17 ka. OSL ages also indicate that mass accumulation rates (MARs) of loess were not constant. MARs were highest and grain size was coarsest during the time of middle Peoria Loess accretion, ~ 23 ka, when ~ 10 m of loess accumulated in no more than ~ 2000 yr and possibly much less. The timing of coarsest grain size and highest MAR, indicating strongest winds, coincides with a summer-insolation minimum at high latitudes in North America and the maximum southward extent of the Laurentide ice sheet. These observations suggest that increased dustiness during the last glacial period was driven largely by enhanced gustiness, forced by a steepened meridional temperature gradient.

Keywords

Peoria loessIowaOptically stimulated luminescence datingTrace element geochemistryMagnetic mineralsLast glacial periodStratigraphyLaurentide ice sheetPaleoclimate
Type
Original Articles
Information
Quaternary Research , Volume 80 , Issue 3 , November 2013 , pp. 468 - 481
Copyright
University of Washington

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