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Clays and Clay Minerals; August 2003; v. 51; no. 4; p. 390-396; DOI: 10.1346/CCMN.2003.0510404
© 2003 Clay Minerals Society
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MAGHEMITE FORMATION IN BURNT PLANT LITTER AT EAST TRINITY, NORTH QUEENSLAND, AUSTRALIA

Kirsty L. Grogan1, Robert J. Gilkes2 and Bernd G. Lottermoser1,*

1 School of Earth Sciences, James Cook University, PO Box 6811, Cairns, Qld 4870, Australia
2 School of Earth and Geographical Sciences, The University of Western Australia, Nedlands, Perth, WA 6009, Australia

* E-mail address of corresponding author: Bernd.Lottermoser{at}jcu.edu.au

Evidence for the formation of maghemite from goethite due to a bushfire on acid sulfate soil at East Trinity, Australia, is presented. Oxidation of pyrite-bearing acid sulfate soils led to precipitation of goethite-impregnated leaf litter. During a major bushfire, goethite with a crystal size calculated from broadening of the 110 reflection of ~9 nm was converted to microcrystalline maghemite (size 12 nm, 220 reflection) and hematite (17 nm, 104 reflection) in a matrix of partly combusted plant litter. Replication of this natural formation of maghemite from goethite was achieved in the laboratory by burning goethite-impregnated leaf litter.

Key Words: Acid Sulfate Soils • Bushfire • Charcoal • Goethite • Iron • Maghemite • Organic Carbon




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Clays and Clay Minerals, April 1, 2006; 54(2): 165 - 175.
[Abstract] [Full Text] [PDF]


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