Geo-Marine Letters

, Volume 28, Issue 1, pp 43–51 | Cite as

Origin of pockmarks and chimney structures on the flanks of the Storegga Slide, offshore Norway

  • Charles K. Paull
  • William UsslerIII
  • W. Steven Holbrook
  • Tessa M. Hill
  • Rendy Keaten
  • Jurgen Mienert
  • Haflidi Haflidason
  • Joel E. Johnson
  • William J. Winters
  • Thomas D. Lorenson
Original

Abstract

Seafloor pockmarks and subsurface chimney structures are common on the Norwegian continental margin north of the Storegga Slide scar. Such features are generally inferred to be associated with fluid expulsion, and imply overpressures in the subsurface. Six long gravity and piston cores taken from the interior of three pockmarks were compared with four other cores taken from the same area but outside the pockmarks, in order to elucidate the origins and stratigraphy of these features and their possible association with the Storegga Slide event. Sulfate gradients in cores from within pockmarks are less steep than those in cores from outside the pockmarks, which indicates that the flux of methane to the seafloor is presently smaller within the pockmarks than in the adjacent undisturbed sediments. This suggests that these subsurface chimneys are not fluid flow conduits lined with gas hydrate. Methane-derived authigenic carbonates and Bathymodiolus shells obtained from a pockmark at >6.3 m below the seafloor indicate that methane was previously available to support a chemosynthetic community within the pockmark. AMS 14C measurements of planktonic Foraminifera overlying and interlayered with the shell-bearing sediment indicate that methane was present on the seafloor within the pockmark prior to 14 ka 14C years b.p., i.e., well before the last major Storegga Slide event (7.2 ka 14C years b.p., or 8.2 ka calendar years b.p.). These observations provide evidence that overpressured fluids existed within the continental margin sediments off Norway during the last major advance of Pleistocene glaciation.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Charles K. Paull
    • 1
  • William UsslerIII
    • 1
  • W. Steven Holbrook
    • 2
  • Tessa M. Hill
    • 3
  • Rendy Keaten
    • 1
  • Jurgen Mienert
    • 4
  • Haflidi Haflidason
    • 5
  • Joel E. Johnson
    • 6
  • William J. Winters
    • 7
  • Thomas D. Lorenson
    • 8
  1. 1.Monterey Bay Aquarium Research InstituteMoss LandingUSA
  2. 2.University of WyomingLaramieUSA
  3. 3.University of California DavisDavisUSA
  4. 4.University of TromsoTromsoNorway
  5. 5.Department of Earth ScienceUniversity of BergenBergenNorway
  6. 6.University of New HampshireDurhamUSA
  7. 7.United States Geological SurveyWoods HoleUSA
  8. 8.United States Geological SurveyMenlo ParkUSA

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