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Maghemite Formation in Burnt Plant Litter at East Trinity, North Queensland, Australia

Published online by Cambridge University Press:  01 January 2024

Kirsty L. Grogan ,
Robert J. Gilkes  and
Bernd G. Lottermoser
Kirsty L. Grogan
Affiliation:
School of Earth Sciences, James Cook University, PO Box 6811, Cairns, Qld 4870, Australia
Robert J. Gilkes
Affiliation:
School of Earth and Geographical Sciences, The University of Western Australia, Nedlands, Perth, WA 6009, Australia
Bernd G. Lottermoser*
Affiliation:
School of Earth Sciences, James Cook University, PO Box 6811, Cairns, Qld 4870, Australia
*
*E-mail address of corresponding author: Bernd.Lottermoser@jcu.edu.au
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Abstract

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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.

Keywords

Acid Sulfate SoilsBushfireCharcoalGoethiteIronMaghemiteOrganic Carbon
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 4 , August 2003 , pp. 390 - 396
Copyright
Copyright © 2003, The Clay Minerals Society

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