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Mass wasting on Alpha Ridge in the Arctic Ocean: new insights from multibeam bathymetry and sub-bottom profiler data

View ORCID ProfileKai Boggild, David C. Mosher, Paola Travaglini, View ORCID ProfileCatalina Gebhardt and Larry Mayer
Geological Society, London, Special Publications, 500, 323-340, 13 May 2020, https://doi.org/10.1144/SP500-2019-196
Kai Boggild
1Geological Survey of Canada, , , Canada
Roles: [Writing - Original Draft (Lead)]
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  • ORCID record for Kai Boggild
  • For correspondence: kai.boggild@canada.ca
David C. Mosher
1Geological Survey of Canada, , , Canada
Roles: [Writing - Original Draft (Supporting)]
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Paola Travaglini
2Canadian Hydrographic Service, Dartmouth, , Canada
Roles: [Data curation (Equal)]
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Catalina Gebhardt
3Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research, , Germany
Roles: [Data curation (Equal)]
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  • ORCID record for Catalina Gebhardt
Larry Mayer
4Center for Coastal and Ocean Mapping/Joint Hydrographic Center, University of New Hampshire, , , USA
Roles: [Data curation (Equal)]
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Abstract

Marine geological and geophysical data from Alpha Ridge in the Arctic Ocean are sparse because of thick perennial sea-ice cover, which prevents access by most surface vessels. Rare seismic data in this area, acquired largely from drifting ice-camps, had shown the hemipelagic drape that covers most of the ridge is highly disrupted within a large (>90 000 km2) south central region. Here, evidence of pronounced seafloor erosion and debris flows infilling seafloor lows was previously interpreted to be the result of a possible bolide impact. In recent years, several icebreaker expeditions have successfully acquired multibeam bathymetry and sub-bottom profiler data in the western segment of this region. Analysis of these data reveals a complex seafloor morphology characterized by ridges and troughs, angular blocks and escarpments as well as seismic facies characterized by hyperbolic seafloor reflections, and convoluted to incoherent and transparent sub-bottom reflectivity. These features are interpreted as evidence of sediment mass movement with varying degrees of lateral transport deformation. At least two episodes of failure are interpreted based on the presence of both buried and surficial mass-transport features. As multiple events are interpreted, seismicity is the most plausible trigger mechanism rather than bolide impact.

  • © 2020 Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources. Published by The Geological Society of London. All rights reserved
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Geological Society, London, Special Publications: 500 (1)
Geological Society, London, Special Publications
Volume 500
2020
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Mass wasting on Alpha Ridge in the Arctic Ocean: new insights from multibeam bathymetry and sub-bottom profiler data

Kai Boggild, David C. Mosher, Paola Travaglini, Catalina Gebhardt and Larry Mayer
Geological Society, London, Special Publications, 500, 323-340, 13 May 2020, https://doi.org/10.1144/SP500-2019-196
Kai Boggild
1Geological Survey of Canada, , , Canada
Roles: [Writing - Original Draft (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Kai Boggild
  • For correspondence: kai.boggild@canada.ca
David C. Mosher
1Geological Survey of Canada, , , Canada
Roles: [Writing - Original Draft (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Paola Travaglini
2Canadian Hydrographic Service, Dartmouth, , Canada
Roles: [Data curation (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Catalina Gebhardt
3Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research, , Germany
Roles: [Data curation (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Catalina Gebhardt
Larry Mayer
4Center for Coastal and Ocean Mapping/Joint Hydrographic Center, University of New Hampshire, , , USA
Roles: [Data curation (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Mass wasting on Alpha Ridge in the Arctic Ocean: new insights from multibeam bathymetry and sub-bottom profiler data

Kai Boggild, David C. Mosher, Paola Travaglini, Catalina Gebhardt and Larry Mayer
Geological Society, London, Special Publications, 500, 323-340, 13 May 2020, https://doi.org/10.1144/SP500-2019-196
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