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TitreLatest Permian mercury anomalies
AuteurSanei, H S; Grasby, S G; Beauchamp, B B
SourceGeology vol. 40, no. 1, 2012 p. 63-66, https://doi.org/10.1130/g32596.1
Année2012
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110250
ÉditeurGeological Society of America
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1130/g32596.1
Mediapapier; en ligne; numérique
Formatspdf
ProvinceNunavut
Sujetsmercure; écosystèmes; processus volcanogènes; Permien
ProgrammeBassin sédimentaire Sverdrup, GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
A sedimentary record from the Buchanan Lake section, Canadian High Arctic, shows anomalous high levels of mercury (Hg) during the Latest Permian Extinction (LPE) on northwest Pangea. Significant influx of Hg progressively overwhelmed the marine system. Major disruption of the organic matter (OM) mediated Hg drawdown process, resulted in accumulation of dissolved Hg to maximum levels at the LPE boundary, impacting an already stressed global ecosystem. A switch to euxinc marine conditions at the LPE boundary led to chemical draw down of Hg-sulphides, as marked by progressive Hg mitigation. This allowed self-recovery from toxic Hg conditions, which ultimately led to re-establishment of the internal Hg-OM drawdown process. We hypothesize that anomalous Hg levels may be attributed to the significant natural atmospheric emissions caused by catastrophic Siberian Traps volcanic eruptions.
GEOSCAN ID289419