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Mass Wasting Along Atlantic Continental Margins: A Comparison Between NW-Africa and the de la Plata River Region (Northern Argentina and Uruguay)

  • S. KrastelEmail author
  • J. Lehr
  • D. Winkelmann
  • T. Schwenk
  • B. Preu
  • M. Strasser
  • R. B. Wynn
  • A. Georgiopoulou
  • T. J. J. Hanebuth
Chapter
Part of the Advances in Natural and Technological Hazards Research book series (NTHR, volume 37)

Abstract

The passive continental margins of the Atlantic Ocean are characterized by thick sedimentary successions, which might become unstable resulting in landslides of various sizes. The type of mass-wasting differs between individual margin sections but the reasons for these differences are not well understood. The NW-African continental margin is characterized by several large-scale but infrequent landslides, while the continental margin in the de la Plata River region (northern Argentina and Uruguay) shows widespread small-scale mass transport deposits. These different styles of mass wasting can be explained by different oceanographic and sedimentary settings. The margin off Northwest Africa is characterized by high primary productivity caused by oceanic upwelling as well as locally focused aeolian input resulting in relatively high sedimentation rates. This setting leads to sediment instabilities arising primarily from underconsolidation of deposited sediments and widespread weak layers. In contrast, the modern ocean margin off Uruguay and northern Argentina is characterized by strong contour currents and a high amount of fluvial sediment resulting in widespread contouritic deposits. These contourites are potentially unstable leading to smaller but more frequent landslides.

Keywords

Submarine landslides Passive margins Atlantic Ocean Acoustic imaging 

Notes

Acknowledgments

We thank all scientists and crew who supported data collection during numerous cruises. The authors are thankful to Domenico Ridente and Asrar Talukder for their reviews and constructive comments. Financial support was provided by the Deutsche Forschungsgemeinschaft.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • S. Krastel
    • 1
    Email author
  • J. Lehr
    • 1
  • D. Winkelmann
    • 2
  • T. Schwenk
    • 3
  • B. Preu
    • 3
  • M. Strasser
    • 4
  • R. B. Wynn
    • 5
  • A. Georgiopoulou
    • 6
  • T. J. J. Hanebuth
    • 3
  1. 1.Institute for GeosciencesChristian-Albrechts-Universität zu KielKielGermany
  2. 2.GEOMAR Helmholtz Centre for Ocean Research KielKielGermany
  3. 3.MARUM – Center for Marine Environmental Sciences, and Faculty of GeosciencesUniversity of BremenBremenGermany
  4. 4.Geological InstituteETH ZurichZurichSwitzerland
  5. 5.National Oceanography CentreSouthamptonUK
  6. 6.University College DublinDublinIreland

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