Sulfur geochemistry as a driver of trace element, rare earth and nutrient cycles in eutrophic estuarine sediment

Bree Morgan

    Research output: ThesisDoctoral Thesis

    315 Downloads (Pure)

    Abstract

    [Truncated abstract] The biogechemical cycling of sulfur (S) may exert both beneficial and adverse impacts on estuarine sediment and water quality. Here, I investigate the influence of S geochemistry on trace element (metal and metalloid), rare earth element and nutrient behaviour within sediments from a eutrophic estuarine system in Western Australia. Iron monosulfides (mainly amorphous and tetragonal FeS) were high in these sediments, shown by elevated acid-volatile sulfide concentrations (AVS, median 158 μmol/g). Porewater iron was generally low (80% of total concentrations in approximately 70% of samples). Rare earth element concentrations, normalised against Post-Archaean Australian Shale, showed mid-REE (MREE) enrichments (median total MREE enrichment 1.30, median reactive MREE enrichment 1.44) and minor positive Ce anomalies (median total Ce anomaly 1.11, median reactive Ce anomaly 1.19).
    Original languageEnglish
    QualificationDoctor of Philosophy
    Supervisors/Advisors
    • Rate, Andrew, Supervisor
    • Burton, Edward, Supervisor, External person
    • Sullivan, Leigh, Supervisor, External person
    Publication statusUnpublished - 2012

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