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

K.L. Grogan, Robert Gilkes, B.G. Lottermoser

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    33 Citations (Web of Science)

    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 similar to9 nm was converted to microcrystalline maghemite (size 12 nm, 220 reflection) and hematite (17 not, 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.
    Original languageEnglish
    Pages (from-to)390-396
    JournalClays and Clay Minerals
    Volume51
    Issue number4
    DOIs
    Publication statusPublished - 2003

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