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Sediment-magnetic signature of land-use and drought as recorded in lake sediment from south-central Minnesota, USA

Published online by Cambridge University Press:  20 January 2017

Christoph E. Geiss ,
Subir K. Banerjee ,
Phil Camill  and
Charles E. Umbanhowar Jr.
Christoph E. Geiss*
Affiliation:
Department of Physics, Trinity College, Hartford, CT 06106, United States
Subir K. Banerjee
Affiliation:
Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, United States
Phil Camill
Affiliation:
Department of Biology, Carleton College, Northfield, MN 55057, United States
Charles E. Umbanhowar Jr.
Affiliation:
Department of Biology, St. Olaf College, Northfield, MN 55057, United States
*
*Corresponding author. Department of Physics, Trinity College, 300 Summit Street, Hartford, CT 06106. E-mail addresses:[email protected](C.E. Geiss), [email protected](S.K. Banerjee), [email protected](P. Camill), [email protected](C.E. Umbanhowar).
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Abstract

Sediment magnetic properties of a short core from Sharkey Lake, MN, record the effects of Euroamerican settlement and climate change over the last 150 yr. The onset of European-style farming led to increased erosion, reflected in high values of concentration-dependent parameters such as magnetic susceptibility (ĸ), Isothermal Remanent Magnetization (IRM), and Anhysteretic Remanent Magnetization (ARM). These high values are only partially due to increased supply of terrigenous material to the lake, and recent sediment contains an additional component of authigenic fine (single-domain) magnetite, most likely magnetosomes from magnetotactic bacteria. High organic productivity in the lake during the 1920s to 1940s drought increased this authigenic component resulting in highly magnetic fine-grained sediment. A comparison with older Holocene sediment from the same lake shows that, over time, most of the fine magnetic signal is lost after deposition, leading to decreases in magnetization and a bimodal grain size distribution of ultrafine, superparamagnetic grains and coarser multidomain particles, evident from measurements of ARM/IRM ratios, hysteresis measurements, and low-temperature analyses. The effects of dissolution and the superposition of climate and land-use signals complicate the use of recent sediments as modern analogs for sediment magnetic analyses.

Keywords

Sediment magnetismHoloceneLimnologyDroughtReductive dissolutionMagnetotactic bacteria
Type
Research Article
Information
Quaternary Research , Volume 62 , Issue 2 , September 2004 , pp. 117 - 125
Copyright
University of Washington

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