Environmental magnetic implications of greigite (Fe3S4) formation in a 3 million year lake sediment record from Butte Valley, Northern California


Roberts, Andrew P., Reynolds, Richard L., Verosub, Kenneth L. and Adam, David P. (1996) Environmental magnetic implications of greigite (Fe3S4) formation in a 3 million year lake sediment record from Butte Valley, Northern California. Geophysical Research Letters, 23, 2859-2862.

Download

Full text not available from this repository.

Description/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 paleolimnological conditions.

Item Type: Article
ISSNs: 0094-8276 (print)
Related URLs:
Subjects: Q Science > QE Geology
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 66120
Date Deposited: 01 May 2009
Last Modified: 27 Mar 2014 18:47
URI: http://eprints.soton.ac.uk/id/eprint/66120

Actions (login required)

View Item View Item