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Geo-Marine Letters

, Volume 32, Issue 1, pp 73–84 | Cite as

Glacial and deglacial seafloor methane emissions from pockmarks on the northern flank of the Storegga Slide complex

  • T. M. HillEmail author
  • C. K. Paull
  • R. B. Critser
Original

Abstract

The Storegga Slide complex is a multi-stage slope failure on the Norwegian continental margin where the most recent major event occurred 8.1 ka b.p. (calendar years before present). Its northern flank contains pockmark features that are commonly inferred to be related to the historical and modern venting of methane-bearing fluids. Three jumbo piston cores (JPC), one from a pockmark and two background cores at variable distances from this site (proximal, 5 km, and distal, 15 km) on the northern flank of the slide (806–1,524 m water depths), were sampled at 10 cm resolution to assess the geologic record of methane venting in the Nyegga pockmark field. Six down-core radiocarbon measurements on mixed planktonic foraminifer species reveal ages of 9.4–16.4 ka b.p. Bathymodiolus mussel shell horizons, indicators of methane-rich environments, have been dated at 15.8–17.6 and ~22 ka b.p. in the pockmark core. Stable isotope analyses on planktonic (Neogloboquadrina pachyderma sinistral) and benthic (Islandiella norcrossi, Melonis barleeanum) Foraminifera reveal δ18O values indicative of a clear glacial/deglacial transition (−1.5‰ shift in planktonic species). Both planktonic and benthic δ13C signatures record multiple excursions, interpreted to reflect the influence of methane in the environment; these δ13C excursions occur in the pockmark core and also in the distal background core. While authigenic calcite formation on the seafloor may play an important role in producing such excursions, these data together suggest the influence of methane seepage within the pockmark field over the past 25 ka, whereby seepage was particularly active between 13 and 15 ka. This is consistent with previously inferred regional increases in porewater pressure associated with glacial loading and higher sedimentation rates, which can cause gas hydrate and slope instability.

Keywords

Dissolve Inorganic Carbon Benthic Foraminifer Planktonic Foraminifer Authigenic Carbonate Methane Hydrate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors wish to thank the scientific party and crew of the R/V Knorr during the Storegga research cruise of 2004. Support was provided by the American Chemical Society Petroleum Research Fund (grant 46345-G2), the Geological Society of America Graduate Student Research Grant program (Critser), the National Science Foundation (OCE-0221366), and the David and Lucile Packard Foundation. Technical assistance was provided by D. Winter at the University of California Davis, and T. Guilderson and the staff of the Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry. Comments by J. Kennett, M.J. Owen, M. Hovland, T. de Garidel-Thoron, three anonymous reviewers, and the journal editors improved the manuscript. This publication is a contribution of the Bodega Marine Laboratory, University of California at Davis.

Supplementary material

367_2011_258_MOESM1_ESM.pdf (44 kb)
Esm 1 (PDF 44.4 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Department of Geology and Bodega Marine LaboratoryUniversity of CaliforniaDavisUSA
  2. 2.Monterey Bay Aquarium Research InstituteMoss LandingUSA

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