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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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 Type:||Article (Refereed Research - C1)|
|Keywords:||acid sulfate soils; bushfire; charcoal; goethite; iron; maghemite; organic; organic carbon; carbon; leaf; litter|
|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%|
|Deposited On:||18 Jun 2009 13:55|
|Last Modified:||18 Oct 2013 00:31|
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