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Isotopic signatures of mercury contamination in latest Permian oceans TEXT SIZE: A A A

Sedimentary records from the northwest margin of Pangea and the Tethys show anomalously high Hg levels at the latest Permian extinction boundary. Background delta Hg-202 values are consistent with normal marine conditions but exhibit negative shifts coincident with increased Hg concentrations. Hg isotope mass-independent fractionation (Delta Hg-199) trends are consistent with volcanic input in deep-water marine environments. In contrast, nearshore environments have Delta Hg-199 signatures consistent with enhanced soil and/or biomass input. We hypothesize that the deep-water signature represents an overall global increase in volcanic Hg input and that this isotope signature is overwhelmed in nearshore locations due to Hg from terrestrial sources. High-productivity nearshore regions may have experienced stressed marine ecosystems due to enhanced Hg loading.

Publication name

 GEOLOGY, 45 (1):55-58; 10.1130/G38487.1 JAN 2017


 Grasby, Stephen E.; Shen, Wenjie; Yin, Runsheng; Gleason, James D.; Blum, Joel D.; Lepak, Ryan F.; Hurley, James P.; Beauchamp, Benoit

Corresponding author(s) 

 Grasby, Stephen E. 
 -Nat Resources Canada, Geol Survey Canada, 3303 33rd St NW, Calgary, AB T2L 2A7, Canada
 -Univ Calgary, Dept Geosci, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada

Author(s) from IGCAS   YIN Runsheng

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