Contaminants in Marine Sedimentary Deposits from Coal Fly Ash During the Latest Permian Extinction

Sanei, Hamed; Grasby, Stephen E.; Beauchamp, Benoı̂t

doi:10.1007/978-94-017-9541-8_5

Cited by 6 publications

(3 citation statements)

References 36 publications

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“…Whilst volcanism is generally regarded as a major control on Hg in the geological record, a number of other processes can affect concentrations of this element in sedimentary rocks (see overviews by Sanei et al, 2012Sanei et al, , 2015Grasby et al, 2013Grasby et al, , 2019Percival et al, 2021b). Although Hg is dominantly sequestered with OM in oxygenated marine conditions, Hg may occasionally be removed and buried via other pathways that are partially controlled by ambient redox conditions.…”

Section: Mercury Concentrations and Normalisationmentioning

confidence: 99%

“…Under anoxic-sulfidic conditions, Hg may be bound with sulphide minerals; yet in well-oxygenated settings where both organic matter and pyrite are limited, Hg may be adsorbed onto clay minerals and/or Fe/Mn oxides (e.g. Sanei et al, 2012Sanei et al, , 2015Grasby et al, 2013Grasby et al, , 2019. Changes in OM source may affect Hg sequestration in OM (Hammer et al, 2019;Them et al, 2019), as can post depositional processes such as weathering (Charbonnier et al, 2020a).…”

Section: Mercury Concentrations and Normalisationmentioning

confidence: 99%

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Volcanism and carbon cycle perturbations in the High Arctic during the Late Jurassic – Early Cretaceous

Vickers

Jelby

Śliwińska

et al. 2023

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Mercury Concentrations and Normalisationmentioning

confidence: 99%

Section: Mercury Concentrations and Normalisationmentioning

confidence: 99%

Volcanism and carbon cycle perturbations in the High Arctic during the Late Jurassic – Early Cretaceous

Vickers

Jelby

Śliwińska

et al. 2023

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Aerosolization of Ni and Hg during the eruptions would have allowed global transport of these tracers (Grasby et al, 2017;Rampino et al, 2020). Elevated Ni is also linked with marine anoxia (Rothman et al, 2014), and it is possible that Hg levels in the ocean may have reached lethal concentrations (Sanei et al, 2015). There are few data to evaluate whether other trace elements-Co, Cr, Cu, and V, for example, might correlate with Ni and Hg, and might also reflect global volcanogenic input.…”

Section: Introductionmentioning

confidence: 99%

Major and Trace Element Geochemistry of the Permian-Triassic Boundary Section at Meishan, South China

et al. 2021

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We report extensive major and trace element data for the Permian-Triassic boundary (PTB) at Meishan, China. Analyses of 64 samples from a 2.5 m section span the last 75 kyr of the Permian and the first 335 kyr of the Triassic, from beds 24 to 34. We also report data for 20 acetic acid extracts that characterize the carbonate fraction. Whole rock major element data reflect the change of lithology from carbonate in the Permian to mudstone and marl in the Triassic, indicate an increase of siliciclastic input and MgO in and above the extinction interval (beds 24f–28), and silica diagenesis in carbonates below the extinction horizon. Above bed 27, enrichment factors calculated with respect to Al and Post-Archean Australian Shale (PAAS) are ∼1 for most trace elements, confirming that siliciclastic input dominates trace element distributions in the Triassic. Within the extinction interval, beds 24f and 26 show increases in As, Mo, U and some transition metals. V, Cr, Co, Ni, Cu, Zn, Pb, and Ba are variably enriched, particularly in bed 26. Below the extinction interval, the top of bed 24d shows enrichment of V, Cr, Co, Ni, Cu, Zn, Pb, and Ba in a zone of diagenetic silicification. Trace elements thus reflect siliciclastic input, diagenetic redistribution, and responses to redox conditions. Trace element patterns suggest either a change in provenance of the detrital component, or a change in the proportion of mechanical to chemical weathering that is coincident with the beginning of the extinction in bed 24f. Ba, Zr, and Zn behave anomalously. Ba shows little variation, despite changes in biological activity and redox conditions. The enrichment factor for Zr is variable in the carbonates below bed 24f, suggesting diagenetic Zr mobility. Zn shows a sharp drop in the extinction horizon, suggesting that its distribution was related to phytoplankton productivity. Rare earth element content is controlled by the siliciclastic fraction, and carbonate extracts show middle rare earth enrichment due to diagenesis. Ce and Eu anomalies are not reliable indicators of the redox environment at Meishan.

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Environmental Archives of Contaminant Particles

Ruppel

2015

Environmental Contaminants

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Contaminants in Marine Sedimentary Deposits from Coal Fly Ash During the Latest Permian Extinction

Cited by 6 publications

References 36 publications

Volcanism and carbon cycle perturbations in the High Arctic during the Late Jurassic – Early Cretaceous

Volcanism and carbon cycle perturbations in the High Arctic during the Late Jurassic – Early Cretaceous

Major and Trace Element Geochemistry of the Permian-Triassic Boundary Section at Meishan, South China

Environmental Archives of Contaminant Particles

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