Geochemical evidence for volcanic activity prior to and enhanced terrestrial weathering during the Paleocene Eocene Thermal Maximum

The Re–Os and major element geochemistry of an expanded gray shale sequence from the Central Basin in Spitsbergen, Svalbard Archipelago (Norway) over the Paleocene Eocene Thermal Maximum (PETM) is presented. The data suggest that a significant volcanic episode, as indicated primarily by a large drop...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 2013-10, Vol.119, p.391-410
Main Authors: Wieczorek, Rebecca, Fantle, Matthew S., Kump, Lee R., Ravizza, Gregory
Format: Article
Language:English
Subjects:
Anoxia
Ashes
Basins
Deposition
Dissolution
Geochemistry
Hydrology
hypoxia
latitude
shale
sodium
volcanic activity
watersheds
Weathering
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Summary:The Re–Os and major element geochemistry of an expanded gray shale sequence from the Central Basin in Spitsbergen, Svalbard Archipelago (Norway) over the Paleocene Eocene Thermal Maximum (PETM) is presented. The data suggest that a significant volcanic episode, as indicated primarily by a large drop in 187Os/188Os, occurred just prior to or coincident with the onset of the PETM. The distinct geochemistry of the inferred ash component is consistent with the geochemistry of contemporaneous ashes previously sampled in Denmark, and persists in the sedimentary record for ∼8ka. Based on the substantial size of the 187Os/188Os decrease (Δ187Os/188Os ∼−0.23), the volcanic event must have involved widespread ash deposition in the local catchment. The terrestrially deposited ash weathered rapidly, shifting the 187Os/188Os of the basin water column to
ISSN:0016-7037
1872-9533
DOI:10.1016/j.gca.2013.06.005