Triggering of the Hinlopen/Yermak Megaslide in relation to paleoceanography and climate history of the continental margin north of Spitsbergen

• Published in: Geochemistry, Geophysics, Geosystems
• Main Authors: Winkelmann, Daniel, Stein, Rüdiger
• Format: Article in Journal/Newspaper
• Language: English
• Published: AGU (American Geophysical Union) 2007
• Subjects: Barents Sea; Svalbard; Svalbard Archipelago; Ice Sheet; Sea ice; Svalbard-Barents Sea Ice sheet; Spitsbergen
• Online Access: https://oceanrep.geomar.de/id/eprint/10946/; https://oceanrep.geomar.de/id/eprint/10946/1/2007_Winkelmann_GGG_2006GC001485.pdf; https://doi.org/10.1029/2006GC001485

[1] On the basis of the detailed sedimentological record of the key-core PS66/309-1 and a review of open literature, we present an assessment of the paleoenvironmental conditions as well as trigger mechanism of the Hinlopen/Yermak Megaslide north of Spitsbergen. The Svalbard archipelago is characterized by strong inflow of Atlantic water accompanied by rapidly falling sea level, rapidly growing Svalbard-Barents Sea-Ice Sheet, and associated increasing glaciotectonic activity during the time window around 30 calendar kyr B. P. of this catastrophic failure event. Thus the potential trigger mechanisms include sediment buoyancy and excess pore pressure, hydrate stability, and tectonic/glaciotectonic processes. While the common scenarios seem to fail to explain this unique submarine megaslide, we focus on glacial processes and their consequences for the regional tectonic framework. We conclude that the Hinlopen/Yermak Megaslide has been the consequence of the rapid onset of Late Weichselian glaciation resulting in a drastic sea level drop, asymmetrical ice loading, and a forebulge development leading to enhanced tectonic movements along the Hinlopen fault zone. As the final trigger we assume a strong earthquake positioned below or close to the SE Sophia Basin.