Massive blow-out craters formed by hydrate-controlled methane expulsion from the Arctic seafloor

K. Andreassen, Alun Hubbard, M. Winsborrow, H. Patton, S. Vadakkepuliyambatta, A. Plaza-Faverola, E. Gudlaugsson, P. Serov, A. Deryabin, R. Mattingsdal, J. Mienert, S. Bünz

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Abstract

Widespread methane release from thawing Arctic gas hydrates is a major concern, yet the processes, sources, and fluxes involved remain unconstrained. We present geophysical data documenting a cluster of kilometer-wide craters and mounds from the Barents Sea floor associated with large-scale methane expulsion. Combined with ice sheet/gas hydrate modeling, our results indicate that during glaciation, natural gas migrated from underlying hydrocarbon reservoirs and was sequestered extensively as subglacial gas hydrates. Upon ice sheet retreat, methane from this hydrate reservoir concentrated in massive mounds before being abruptly released to form craters. We propose that these processes were likely widespread across past glaciated petroleum provinces and that they also provide an analog for the potential future destabilization of subglacial gas hydrate reservoirs beneath contemporary ice sheets.
Original languageEnglish
Pages (from-to)948-953
Number of pages6
JournalScience
Volume356
Issue number6341
DOIs
Publication statusPublished - 02 Jun 2017

Keywords

  • Arctic Regions
  • Climate Change
  • Geological Phenomena
  • Ice Cover
  • Methane
  • Models, Theoretical
  • Oceans and Seas

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