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Pockmarks on the Mendeleev Rise, central Arctic Ocean

M. Jakobsson and M. O'Regan
Geological Society, London, Memoirs, 46, 297-298, 30 November 2016, https://doi.org/10.1144/M46.120
M. Jakobsson
Department of Geological Sciences, Stockholm University, Svante Arrhenius väg 8, 106 91 Stockholm, Sweden
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  • For correspondence: martin.jakobsson@geo.su.se
M. O'Regan
Department of Geological Sciences, Stockholm University, Svante Arrhenius väg 8, 106 91 Stockholm, Sweden
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Circular to semi-circular crater-like depressions in the seafloor are commonly referred to as pockmarks. Pockmarks were discovered in the 1960s on echo-sounding profiles from the Scotian Shelf, eastern Canada (King & MacLean 1970). While there is no consensus regarding their formation process, pockmarks are in general linked to the removal of soft surface sediments during fluid escape at the seafloor (Judd & Hovland 2009). In the Arctic Ocean, pockmarks are found in sizes ranging from <1 to >100 m in diameter, both on the continental shelf and in deeper-water settings. Within a limited area of the Mendeleev Rise crest at about 78°20′ N, pockmarks dominate the seafloor morphology in water depths around 800 m.

Description

The Mendeleev Rise comprises one of the major undersea features in the Arctic Ocean; it extends approximately 900 km along the 180° meridian from the continental slope west of Chukchi Borderland to about 84° N (Fig. 1a). Portions of the rise shallower than approximately 1000 m were subjected to ice grounding, except in the vicinity of 78° 20′ N where the 800 m deep crest contains no direct evidence of ice scouring (Jakobsson et al. 2014). Multibeam swath bathymetry collected with USCGC Healy in …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Pockmarks on the Mendeleev Rise, central Arctic Ocean

M. Jakobsson and M. O'Regan
Geological Society, London, Memoirs, 46, 297-298, 30 November 2016, https://doi.org/10.1144/M46.120
M. Jakobsson
Department of Geological Sciences, Stockholm University, Svante Arrhenius väg 8, 106 91 Stockholm, Sweden
  • Find this author on Google Scholar
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  • Search for this author on this site
  • For correspondence: martin.jakobsson@geo.su.se
M. O'Regan
Department of Geological Sciences, Stockholm University, Svante Arrhenius väg 8, 106 91 Stockholm, Sweden
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  • Find this author on PubMed
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Pockmarks on the Mendeleev Rise, central Arctic Ocean

M. Jakobsson and M. O'Regan
Geological Society, London, Memoirs, 46, 297-298, 30 November 2016, https://doi.org/10.1144/M46.120
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