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Magnetic Stratigraphy of Lake Michigan Sediments Obtained from Cores of Lacustrine Clay

Published online by Cambridge University Press:  20 January 2017

Abstract

Postglacial and lacustrine sediments from Lake Michigan have been paleomagnetically investigated. The primary goal was to test the feasibility of correlation between several cores in terms of their magnetic signatures. After alternating field and thermal demagnetizations, inclination and relative declination values were obtained that show characteristic short-term fluctuations. Major features, including changes in the magnetic intensity of the samples, correlate well in three of the longer cores, in good agreement with independent lithostratigraphic determinations. In addition, we have been able to detect local disconformities that appear as interruptions of the magnetic record. A continuous record of normal polarity has been found, extending from the present day to 13,000 14C vears BP. No reversals were recorded, though at two stratigraphic levels shallow inclinations, together with declination swings and low intensities of magnetization, may indicate rapid geomagnetic excursions. The magnetic record was attained at the time of deposition or shortly thereafter, and can be used for a wide range of applications.

Type
Research Article
Copyright
University of Washington

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References

Briden, J.C. Ward, M.A. (1966). Analysis of magnetic inclination in boreholes Pure and Applied Geophysics 63 133-152 Google Scholar
Broecker, W.S. Farrand, W.R. (1963). Radiocarbon age of the Two Creeks forest bed, Wisconsin Geological Society of America Bulletin 74 795-802 Google Scholar
Cox, A. (1968). Length of geomagnetic polarity intervals Journal of Geophysical Research 73 3247-3260 Google Scholar
Creer, K.M. Gross, D.L. Lineback, J.A. (1976). Origin of regional geomagnetic variations recorded by Wisconsinan and Holocene sediments from Lake Michigan, U.S.A., and Lake Windermere, England Geological Society of America Bulletin 87 531-540 2.0.CO;2>CrossRefGoogle Scholar
Evenson, E.B. (1973). Late Pleistocene shorelines and stratigraphic relations in the Lake Michigan basin Geological Society of America Bulletin 84 2281-2298 2.0.CO;2>CrossRefGoogle Scholar
Farrand, W.R. Zahner, R. Benninghoff, W.S. (1969). Cary-Port Huron Interstade: Evidence from a buried Bryophyte bed, Cheboygan county, Michigan Geological Society of America Special Papers 123 249-262 Google Scholar
Griffiths, D.H. King, R.F. Rees, A.I. Wright, A.E. (1960). The Remanent Magnetization of some recent varved sediments Proceedings of the Royal Society of London, Series A 256 359-383 Google Scholar
Gross, D.L. Lineback, J.A. Shimp, N.F. White, W.A. (1972). Composition of Pleistocene sediments in southern Lake Michigan, U.S.A. International Geological Congress, 24th, Montreal 1972, Proceedings Section 8 215-222 Google Scholar
Harrison, J.E. (1972). Quaternary Geology of the North Bay-Mattawa RegionGeological Survery Canada Paper 71-26Google Scholar
Hough, J.L. (1955). Lake Chippewa, a low stage of Lake Michigan, indicated by bottom sediments Geological Society of America Bulletin 66 957-968 Google Scholar
King, R.F. (1955). The Remanent Magnetism of artificially deposited sediments Monthly Notices of the Royal Astronomical Society, Geophysical Supplement 7 115-134 Google Scholar
Lineback, J.A. Ayer, N.J. Gross, D.L. (1970). Stratigraphy of Unconsolidated Sediments in the Southern Part of Lake MichiganIllinois Geological Survey Environmental Geology Note 35 Google Scholar
Lineback, J.A. Gross, D.L. Meyer, R.P. Unger, W.L. (1971). High-Resolution Seismic Profiles and Gravity Cores of Sediments in Southern Lake MichiganIllinois Geological Survey Environmental Geology Note 47 Google Scholar
Lineback, J.A. Gross, D.L. Meyer, R.P. (1972). Geologic Cross Sections Derived from Seismic Profiles and Sediment Cores from Southern Lake MichiganIllinois Geological Survey Environmental Geology Note 54 Google Scholar
Lineback, J.A. Gross, D.L. Meyer, R.P. (1974). Glacial Tills under Lake MichiganIllinois Geological Survey Environmental Geology Note 69 Google Scholar
Mackereth, F.H. (1971). On the variation in direction of the horizontal component of remanent magnetization in lake sediments Earth and Planetary Science Letters 12 332-338 Google Scholar
Mörner, N.-A. Lanser, J.P. (1974). Gothenburg magnetic “flip” Nature (London) 251 408-409 Google Scholar
Mörner, N.-A. Lanser, J.P. Hospers, J. (1971). Late Weichselian paleomagnetic reversal Nature (London) 234 173-174 Google Scholar
Opdyke, N.D. Ninkovich, D. Lowrie, W. Hays, J. (1972). The paleomagnetism of two Aegean deep-sea cores Earth and Planetary Science Letters 14 145-159 Google Scholar
Stupavsky, M. Gravenor, C.P. Symons, D.T.A. (1974). Paleomagnetism and magnetic fabric of the Leaside and Sunnybrook tills near Toronto, Ontario Geological Society of America Bulletin 85 1233-1236 Google Scholar
Thompson, R. (1973). Paleolimnology and paleomagnetism Nature (London) 242 182-184 Google Scholar
Verosub, K.L. (1975). Paleomagnetic excursions as magnetostratigraphic horizons: a cautionary note Science 190 48-50 Google Scholar
Willman, H.B. Frye, J.C. (1970). Pleistocene Stratigraphy of IllinoisIllinois Geological Survey Bulletin 94Google Scholar
Wilson, R.L. (1971). Dipole offset: the time-average field over the last 25 million years Geophysical Journal 22 491-504 Google Scholar