Skip to main content

The Norwegian–Barents–Svalbard (NBS) continental margin: Introducing a natural laboratory of mass wasting, hydrates, and ascent of sediment, pore water, and methane

Abstract

 Side-scan sonar mapping and ground-truthing of the Norwegian–Barents–Svalbard continental margin shed new light on shelf glaciation, mass wasting, hydrates, and features like the Håkon Mosby mud volcano (HMMV), reflecting upward mobility of gas, pore fluids, and sediments. Detailed HMMV examination revealed thermal gradients to 10°/m, bottom-water CH4 and temperature anomalies, H2S- and CH4-based chemosynthetic ecosystems, and subbottom methane hydrate (to 25%). Seismic and chemical data suggest HMMV origins at 2–3 km depth within the 6-km-thick depocenter. The HMMV and mound fields bordering the Bjørnøyrenna slide valley and pockmarks bordering the Storegga slide may all have formed in response to sediment failure.

This is a preview of subscription content, access via your institution.

Author information

Affiliations

Authors

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Vogt, P., Gardner, J. & Crane, K. The Norwegian–Barents–Svalbard (NBS) continental margin: Introducing a natural laboratory of mass wasting, hydrates, and ascent of sediment, pore water, and methane. Geo-Marine Letters 19, 2–21 (1999). https://doi.org/10.1007/s003670050088

Download citation

Keywords

  • Pore Water
  • Methane Hydrate
  • Sonar
  • Continental Margin
  • Temperature Anomaly