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Environmental magnetic implications of greigite (Fe3S4) formation in a 3 m.y. lake sediment record from Butte Valley, northern California Andrew

Geophysical Research Letters

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Abstract

Authigenic greigite (Fe3S4) has been identified in several horizons of lake beds in a 102-m core from Butte Valley, northern California, using mineral magnetic methods and x-ray diffraction analysis. The presence of greigite has several implications for the paleoenvironmental record from Butte Valley. First, its occurrence in 2.5 - 3.0 Ma strata confirms that greigite can persist in the geological record for long periods of time. Second, the detrital mineral magnetic record may be partially obscured by the presence of authigenic greigite and care must be taken in interpreting magnetic variations in the greigite-bearing zones as paleoclimate proxies. Third, differences in the timing of remanence acquisition for authigenic and detrital phases may compromise studies of high-frequency geomagnetic field variations. Fourth, greigite may also be significant as a paleoenvironmental indicator of lake and sediment chemistry. The magnetic detection of greigite may therefore provide important information about palcolimnological conditions. Copyright 1996 by the American Geophysical Union.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Environmental magnetic implications of greigite (Fe3S4) formation in a 3 m.y. lake sediment record from Butte Valley, northern California Andrew
Series title:
Geophysical Research Letters
Volume
23
Issue:
20
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
2859
Last page:
2862