Maghemite formation in burnt plant litter at East Trinity, north Queensland, Australia

Grogan, Kirsty L., Gilkes, Robert J., and Lottermoser, Bernd G. (2003) Maghemite formation in burnt plant litter at East Trinity, north Queensland, Australia. Clays and Clay Minerals, 51 (4). pp. 390-396.

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Abstract

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.

Item ID: 3475
Item Type: Article (Refereed Research - C1)
Keywords: acid sulfate soils; bushfire; charcoal; goethite; iron; maghemite; organic; organic carbon; carbon; leaf; litter
ISSN: 1552-8367
Date Deposited: 18 Jun 2009 03:55
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040306 Mineralogy and Crystallography @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
Citation Count from Web of Science Web of Science 12
Downloads: Total: 2
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