The geochemistry of iron in Recent tidal-flat sediments of the Wash area, England: a mineralogical, Mössbauer, and magnetic study

Suttill, R.J.; Turner, Peter; Vaughan, David J.

doi:10.1016/0016-7037(82)90247-2

Cited by 37 publications

(14 citation statements)

References 24 publications

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“…These values correspond closely with those reported for chlorites (Coey, 1980;Blaauw et al, 1980;Kodama et al, 1982), as well as for chlorite-rich sediments (Coey, 1975;Johnston and Glasby, 1982;Suttill et al, 1982;Manning et al, 1983). The increase in A and 6 at low temperature was also in agreement with reported 77-K measurements on chlorite (Blaauw et aL, 1980) and chlorite-rich sediments (Coey, 1975).…”

Section: Resultssupporting

confidence: 89%

Mössbauer Spectroscopic Study of the Iron Mineralogy of Post-Glacial Marine Clays

Torrance

1986

Clays and clay miner.

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Abstract--Three post-glacial marine clays from eastern Canada and one marine clay from Japan have been studied by M6ssbauer spectroscopy to ascertain their iron mineralogy. Small amounts of hematite (in two samples) and magnetite (in one sample) were found in the Canadian clays, and hematite was detected in the Japanese clay. The major spectral components were ferrous and ferric doublets, consistent with X-ray powder diffraction results that show chlorite, mica, and amphibole in the Canadian samples and smectite in the Japanese sample. Citrate-dithionite extraction removed hematite and most of the magnetite from these samples. Acid-base extraction also removed chlorite and some mica from the Canadian samples. Samples treated by these extractions had appreciably lower geotechnical yield stresses at given water contents.

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Section: Resultssupporting

confidence: 89%

Mössbauer Spectroscopic Study of the Iron Mineralogy of Post-Glacial Marine Clays

Torrance

1986

Clays and clay miner.

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“…The Fe(II) doublets were assigned to cis-and trans-Fe(II) sites of clinochlore. The calculated values were similar to those reported by Suttill et al (1982) for chlorites. The central doublet in the RT Mössbauer spectrum of the clay fraction (Fig.…”

Section: Room Temperature Mössbauer Measurements Of the Pristine Sedisupporting

confidence: 89%

Biogeochemical transformation of Fe minerals in a petroleum-contaminated aquifer

Zachara

Kukkadapu

Gassman

et al. 2004

Geochimica et Cosmochimica Acta

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Abstract-The Bemidji aquifer in Minnesota, USA is a well-studied site of subsurface petroleum contamination. The site contains an anoxic groundwater plume where soluble petroleum constituents serve as an energy source for a region of methanogenesis near the source and bacterial Fe(III) reduction further down gradient. Methanogenesis apparently begins when bioavailable Fe(III) is exhausted within the sediment. Past studies indicate that Geobacter species and Geothrix fermentens-like organisms are the primary dissimilatory Fe-reducing bacteria at this site. The Fe mineralogy of the pristine aquifer sediments and samples from the methanogenic (source) and Fe(III) reducing zones were characterized in this study to identify microbiologic changes to Fe valence and mineral distribution, and to identify whether new biogenic mineral phases had formed. Methods applied included X-ray diffraction; X-ray fluorescence (XRF); and chemical extraction; optical, transmission, and scanning electron microscopy; and Mössbauer spectroscopy.All of the sediments were low in total Fe content (Ϸ 1%) and exhibited complex Fe-mineralogy. The bulk pristine sediment and its sand, silt, and clay-sized fractions were studied in detail. The pristine sediments contained Fe(II) and Fe(III) mineral phases. Ferrous iron represented approximately 50% of Fe TOT . The relative Fe(II) concentration increased in the sand fraction, and its primary mineralogic residence was clinochlore with minor concentrations found as a ferroan calcite grain cement in carbonate lithic fragments. Fe(III) existed in silicates (epidote, clinochlore, muscovite) and Fe(III) oxides of detrital and authigenic origin. The detrital Fe(III) oxides included hematite and goethite in the form of mm-sized nodular concretions and smaller-sized dispersed crystallites, and euhedral magnetite grains. Authigenic Fe(III) oxides increased in concentration with decreasing particle size through the silt and clay fraction. Chemical extraction and Mössbauer analysis indicated that this was a ferrihydrite like-phase. Quantitative mineralogic and Fe(II/III) ratio comparisons between the pristine and contaminated sediments were not possible because of textural differences. However, comparisons between the texturally-similar source (where bioavailable Fe(III) had been exhausted) and Fe(III) reducing zone sediments (where bioavailable Fe(III) remained) indicated that dispersed detrital, crystalline Fe(III) oxides and a portion of the authigenic, poorly crystalline Fe(III) oxide fraction had been depleted from the source zone sediment by microbiologic activity. Little or no effect of microbiologic activity was observed on silicate Fe(III). The presence of residual "ferrihydrite" in the most bioreduced, anoxic plume sediment (source) implied that a portion of the authigenic Fe(III) oxides were biologically inaccessible in weathered, lithic fragment interiors. Little evidence was found for the modern biogenesis of authigenic ferrous-containing mineral phases, perhaps with the exception of thin siderite...

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“…Greigite, commonly classified as an acid-volatile sulphide (AVS), represents an intermediate precursor phase in the formation of pyrite (FeS 2 ) in anoxic sediments, and tends to be preserved if the supply of sulphur (as sulphate) is limited and the pyritisation process arrested (Roberts, 1995;Wilken and Barnes, 1996). Although greigite can be found in both marine and freshwater environments, it is commonly found in high concentrations in rapidly deposited marine sediments and brackish water environments, where the supply of sulphate is limited (e.g., Suttil et al, 1982;Tric et al, 1991;Roberts and Turner, 1993;Hallam and Maher, 1994;Lee and Jin, 1995;Torii et al, 1996). A high content (and influx) of organic carbon is generally required for greigite formation in freshwater sediments, which is often associated with both naturally and anthropogenically induced eutrophication (e.g.…”

Section: Discussionmentioning

confidence: 99%

Stratigraphic evidence for a high marine shore‐line during the late Weichselian deglaciation on the Kullen Peninsula, southern Sweden

et al. 1999

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The geochemistry of iron in Recent tidal-flat sediments of the Wash area, England: a mineralogical, Mössbauer, and magnetic study

Cited by 37 publications

References 24 publications

Mössbauer Spectroscopic Study of the Iron Mineralogy of Post-Glacial Marine Clays

Mössbauer Spectroscopic Study of the Iron Mineralogy of Post-Glacial Marine Clays

Biogeochemical transformation of Fe minerals in a petroleum-contaminated aquifer

Stratigraphic evidence for a high marine shore‐line during the late Weichselian deglaciation on the Kullen Peninsula, southern Sweden

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