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Open-File Report 2008–1352

Mineralogic Causes of Variations in Magnetic Susceptibility of Late Pleistocene and Holocene Sediment from Great Salt Lake, Utah

By Richard L. Reynolds, Joseph G. Rosenbaum, and Robert S. Thompson

Abstract

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We describe here results of magnetic susceptibility (MS) measurements and magnetic mineralogy of sediments sampled in three cores from the south basin of Great Salt Lake. The cores were obtained in 1996 with a Kullenburg-type piston corer at sites in close proximity: core 96-4 at 41° 01.00' N, 112° 28.00' W and cores 96-5 and 96-6 at 41° 00.09' N, 112° 23.05' W. Cores 96-5 (2.16 m long) and -6 combine to make a composite 11.31-m sediment record. Sediments in core 96-4 (5.54 m long) correspond to the approximate depth interval of 3.9—9.6 m in the composite core of 96-5 and -6 based on similarities in the MS records as described below.

The central goal of the research was to provide a sediment record of paleoenvironmental change in the northeastern Basin and Range Province over the past 40,000 years. Specific targets included a sedimentologic record of lake-level change combined with a pollen record of climatic change.

Version 1.0

Posted December 2008

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Suggested citation:

Reynolds, R.L., Rosenbaum, J.G., and Thompson R.S., 2008, Mineralogic causes of variations in magnetic susceptibility of Late Pleistocene and Holocene sediment from Great Salt Lake, Utah: U.S. Geological Survey Open-File Report 2008–1352, 17 p.



Contents

Introduction and Methods

Age, Features, and Magnetic Susceptibility of the Sediments

Summary of Petrographic Observations

Preliminary Interpretations Linking Magnetic Susceptibility, Magnetic Mineralogy, and Late Quaternary Chemical Conditions in Great Salt Lake

Acknowledgments

References Cited


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