nerc.ac.uk

Record of methane emissions from the West Svalbard continental margin during the last 23,500years revealed by δ13C of benthic foraminifera

Panieri, Giuliana; James, Rachael H.; Camerlenghi, Angelo; Westbrook, Graham K.; Consolaro, Chiara; Cacho, Isabel; Cesari, Valentina; Cervera, Cristina Sanchez. 2014 Record of methane emissions from the West Svalbard continental margin during the last 23,500years revealed by δ13C of benthic foraminifera. Global and Planetary Change, 122. 151-160. 10.1016/j.gloplacha.2014.08.014

Full text not available from this repository.

Abstract/Summary

The values of δ13C in benthic foraminifera have been measured in a gas-hydrate-bearing sediment core collected from an area of active methane venting on the Vestnesa Ridge (West Svalbard continental margin) to reconstruct the local history of methane emissions over the past 23,500 years BP. The chronostratigraphic framework of the core has been derived from AMS 14C dates and biostratigraphic analysis. While foraminifera from some intervals have δ13C within the normal marine range (0 to -1‰), five intervals are characterised by much lower δ13C, as low as -17.4‰. These intervals are interpreted to record the incorporation of 13C-depleted carbon in the presence of methane emissions at the seafloor during biomineralization of the carbonate foraminiferal tests and subsequent secondary mineralization. Methane emission events (MEE) occur from the Last Glacial Maximum (LGM) to the Holocene, with the most prominent one, in terms of δ13C depletion, predating the Bølling-Allerød Interstadial (GI-1 in the Greenland ice core record). The lack of correlation between the values of δ13C and δ18O, however, appears to preclude warming of bottom waters as the principal control on methane release. Rather, it seems likely that methane release is a consequence of episodicity in the supply of gas to the hydrate system and in the processes that enable methane gas to migrate through the hydrate stability field to the seabed, or of other geological processes still under debate.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.gloplacha.2014.08.014
ISSN: 09218181
Additional Keywords: Methane emission; Vestnesa Ridge; West Svalbard; Stable isotope; δ13C; Benthic foraminifera
Date made live: 27 Aug 2014 14:31 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/508249

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...