Erosion of the seafloor at the top of the gas hydrate stability zone on the Hikurangi Margin, New Zealand

Details Erosion of the seafloor at the top of the gas hydrate stability zone on the Hikurangi Margin, New Zealand Erosion of the seafloor at the top of the gas hydrate stability zone on the Hikurangi Margin, New Zealand

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3224603p&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 24, CiteID L24603

Physics

Geophysics

4

Marine Geology And Geophysics: Gas And Hydrate Systems, Marine Geology And Geophysics: Marine Seismics (0935, 7294), Marine Geology And Geophysics: Seafloor Morphology, Geology, And Geophysics, Marine Geology And Geophysics: Subduction Zone Processes (1031, 3613, 8170, 8413), Marine Geology And Geophysics: Submarine Landslides

Scientific paper

The dissociation of gas hydrates in sediment pores is thought to decrease seafloor strength potentially facilitating submarine slides because of the generation of overpressured gas and the ``melting'' of load-bearing or cementing solid hydrate. Here, we present findings that suggest gas hydrates may lead to a previously unknown mechanism of seafloor erosion. Gas-hydrate-bearing sub-sea ridges on the Hikurangi Margin are eroded close to the top of the hydrate stability field in the ocean. We hypothesize that gas hydrate instability may lead to ridge erosion by a combination of two processes; hydrate destabilization caused by depressurization during ridge uplift, and repeated pore volume expansion and contraction from hydrate dissociation and formation triggered by fluctuating water temperatures.

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