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2015 | OriginalPaper | Buchkapitel

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

verfasst von : Hamed Sanei, Stephen E. Grasby, Benoit Beauchamp

Erschienen in: Environmental Contaminants

Verlag: Springer Netherlands

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Abstract

The Latest Permian Extinction (LPE) event, the greatest mass extinction in Earth history, was marked by major explosive volcanic eruptions through thick layers of coal and carbonaceous deposits at the time. This resulted in significant dispersion of volcanic-derived ash and other particulate and gaseous hazardous substances, which may have caused extensive contamination of the global marine ecosystem.

A continuous geological sedimentary record from the Canadian High Arctic revealed evidence of unprecedented mercury loading that may have contributed to the extinction. Mercury loading is attributed to combined effects of volcanic emissions in association with volcanic combustion of surface and subsurface coal and carbonaceous deposits.

Mercury influx exceeded the scavenging capacity of organic matter (OM) in the Late Permian ocean, leading to major disruption of mercury drawdown processes mediated by organic carbon. This resulted in buildup of dissolved mercury to maximum levels at the LPE boundary. The transition of the Latest Permian ocean to euxinic conditions allowed sulphide scavenging of mercury from ocean water, beginning a self-mitigation process that led to gradual recovery from toxic marine conditions.

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Vorheriges Kapitel Calculating Rates and Dates and Interpreting Contaminant Profiles in Biomixed Sediments

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Titel: Contaminants in Marine Sedimentary Deposits from Coal Fly Ash During the Latest Permian Extinction
verfasst von: Hamed Sanei
Stephen E. Grasby
Benoit Beauchamp
Verlag: Springer Netherlands
Buch: Environmental Contaminants
Print ISBN: 978-94-017-9540-1

Electronic ISBN: 978-94-017-9541-8

Copyright-Jahr: 2015
DOI: https://doi.org/10.1007/978-94-017-9541-8_5