Pyrite micromorphology in three Australian Holocene sediments

Richard T. Bush, Leigh A. Sullivan

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The distribution and morphology of pyrite in 3 Holocene estuarine sediments were examined using light microscopy, analytical scanning electron microscopy, and X-ray diffraction. The distribution and morphologies of pyrite were similar with pyrite being dispersed throughout the soil matrices as well as concentrated in root remnants and other macropores. The pyrite occurred in both framboidal and irregularly shaped dense clusters from 4 to 15 μm diameter, and also in loose clusters. Individual crystals in these clusters ranged in size from 1 to 2 μm. Pyrite crystals exhibited octahedral, pyritohedral, and equant anhedral (i.e. rounded globular) habit. Organic matter coatings and clay coatings were common around pyrite at each site. Thin coatings of monosulfide with an acicular morphology occurred around some framboidal clusters at one site. The distribution of framboids and individual crystals in the clayey matrix, root remnants, and other macropores indicates that the pyrite in these sediments has formed in situ. These data have important implications for the rate of sulfide oxidation and acid production from these soils.

Original languageEnglish
Pages (from-to)637-653
Number of pages17
JournalAustralian Journal of Soil Research
Volume37
Issue number4
DOIs
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

micromorphology
microstructure
pyrite
Sediments
Holocene
sediments
sediment
coatings
crystals
coating
macropores
macropore
crystal
Coatings
Crystals
Soils
estuarine sediments
matrix
estuarine sediment
Sulfides

Cite this

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abstract = "The distribution and morphology of pyrite in 3 Holocene estuarine sediments were examined using light microscopy, analytical scanning electron microscopy, and X-ray diffraction. The distribution and morphologies of pyrite were similar with pyrite being dispersed throughout the soil matrices as well as concentrated in root remnants and other macropores. The pyrite occurred in both framboidal and irregularly shaped dense clusters from 4 to 15 μm diameter, and also in loose clusters. Individual crystals in these clusters ranged in size from 1 to 2 μm. Pyrite crystals exhibited octahedral, pyritohedral, and equant anhedral (i.e. rounded globular) habit. Organic matter coatings and clay coatings were common around pyrite at each site. Thin coatings of monosulfide with an acicular morphology occurred around some framboidal clusters at one site. The distribution of framboids and individual crystals in the clayey matrix, root remnants, and other macropores indicates that the pyrite in these sediments has formed in situ. These data have important implications for the rate of sulfide oxidation and acid production from these soils.",
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Pyrite micromorphology in three Australian Holocene sediments. / Bush, Richard T.; Sullivan, Leigh A.

In: Australian Journal of Soil Research, Vol. 37, No. 4, 1999, p. 637-653.

Research output: Contribution to journalArticle

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AU - Bush, Richard T.

AU - Sullivan, Leigh A.

PY - 1999

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