Other ID: 2008-007-PGC; T-29-08-NP
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Principal Investigator(s): John Pohlman
Affiliate Investigator(s): Michael Riedel, McGill University; Ross Haacke, Geological Survey of Canada
Information Specialist(s): John Pohlman
Data Type(s): Geochemical: Surveys, Imagery: Photo, Location-Elevation: Navigation, Sampling: Chemistry, Sampling: Geology
Scientific Purpose/Goals: 1) To determine the timing and cause of submarine slumps at the frontal ridge; 2) to investigate the role of gas hydrate in the mechanisms controlling and responding to submarine slumping; and 3) to determine the potential for fluid and gas venting and formation of gas hydrate in and around the slump sites.
Start Date: 2008-07-29
Start Port/Location: Sidney, British Columbia, Canada
End Date: 2008-08-12
End Port/Location: Sidney, British Columbia, Canada
Equipment Used: GPS (wh), Ion Chromatograph;, Digital camera, Corer - gravity, Pore water sampling
Information to be Derived: Samples and chemical analysis;
Summary of Activity and Data Gathered: Acquired pore water and sediment samples for numerous chemical and isotopic analyses to aid in interpreting the cause and history of submarine landslides along the base of the Northern Cascadia Margin and the cycling of methane carbon and higher hydrocarbons at several mid-slope seep sites. About 75% of the pore water samples collected have been analyzed for sulfate and chloride concentration.
Staff: Philip Bernard, John Pohlman, William Waite
Notes: Cruise Report submitted in conjunction with the lead organization, Pacific Geoscience Centre, Geological Survey of Canada. Contact John Pohlman for copy of cruise report. Original Center People field contained: John Pohlman: Lead Geochemist; William Waite: Assistant Geochemist; Peter Bratton: Mobilization/labeling/supply preparation; PJ Bernard: Shipping.
Cascadia margin, Vancouver Island, Canada, North Pacific;48.60 deg N 127.04 deg W;Barkley Canyon, Vancouver Island, Canada, North Pacific;48.31 deg N 126.06 deg W;
Enkin, R., Esteban, L., Haacke, R., Hamilton, T.S., Hogg, M., Lapham, L., Middleton, G., Neelands, P., Pohlman, J., Riedel, M., Rose, K., Schlesinger, A., Standen, G., Stephenson, A., Taylor, S., Waite, W., and Wang, X., 2008, Investigating gas hydrate as a factor in accretionary margin frontal ridge slope failures and cold seep biogeochemistry: Fire in the Ice, U.S. Department of Energy/National Energy Technology Laboratory, Methane Hydrate Newsletter, Fall 2008, , URL: http://www.netl.doe.gov/technologies/oil-gas/publications/Hydrates/Newsletter/HMNewsFall08.pdf.
Pohlman, J.W., Riedel, M., Waite, W., Rose, K., and Lapham, L., 2008, Application of rhizon samplers to obtain high-resolution pore fluid records during geochemical investigations of gas hydrate systems: Fire in the Ice, U.S. Department of Energy/National Energy Technology Laboratory, Methane Hydrate Newsletter, Fall 2008, , URL: http://www.netl.doe.gov/technologies/oil-gas/publications/Hydrates/Newsletter/HMNewsFall08.pdf.