georefid:2007-035096georefid:2007-035088SEDIS Publication Catalogue

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http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.204.104.20062005-01-01publicationgeorefid:2007-035096doi:10.2973/odp.proc.sr.204.104.2006Riedel, MichaelGeological Survey of Canada, Pacific Geoscience Centre, Sidney, BC, CanadaauthorLong, Philip E.Christian-Albrechts-Universitaet zu Kiel, Federal Republic of GermanyauthorLiu, Char-ShineJoint Oceanographic Institutions, United StatesauthorSchultheiss, PeterUniversity of Texas at Austin, United StatesauthorCollett, Timothy S.University of Leicester, United KingdomauthorTrehu, Anne M.Eastern Kentucky University, United StatesauthorBohrmann, GerhardU. S. Geological Survey, United StatesauthorTorres, Marta E.Pacific Northwest National Laboratory, United StatesauthorRack, Frank R.National Taiwan University, TaiwanauthorBangs, Nathan L.Geotek, United KingdomauthorBarr, Samantha R.U. S. Geological Survey, United StatesauthorBorowski, Walter S.authorClaypool, George E.authorDelwiche, Mark E.authorDickens, Gerald R.authorGoldberg, David S.authorGracia, EulaliaauthorGuerin, GillesauthorHolland, MelanieauthorJohnson, Joel E.authorLee, Young-JooauthorMilkov, Alexei V.authorSu XinauthorTeichert, BarbaraauthorTomaru, HitoshiauthorVanneste, MaartenauthorWatanabe, MahitoauthorWeinberger, Jill L.authorTexas A&M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Trehu, Anne M., Bohrmann, Gerhard, Torres, Marta E., Rack, Frank R., Bangs, Nathan L., Barr, Samantha R., Borowski, Walter S., Claypool, George E., Collett, Timothy S., Delwiche, Mark E., Dickens, Gerald R., Goldberg, David S., Gracia, Eulalia, Guerin, Gilles, Holland, Melanie, Johnson, Joel E., Lee, Young-Joo, Liu, Char-Shine, Long, Philip E., Milkov, Alexei V., Riedel, Michael, Schultheiss, Peter, Su Xin, Teichert, Barbara, Tomaru, Hitoshi, Vanneste, Maarten, Watanabe, Mahito, Weinberger, Jill L., Boetius, Antje, Brockman, Fred J., Deyhle, Annette, Fehn, Udo, Flemings, Peter B., Girguis, Peter R., Heesemann, Martin, Joye, Samantha B., Lorenson, Thomas D., Mills, Christopher T., Musgrave, Robert J., Popa, Radu, Ussler, Bill, Wilkes, Heinz, Winckler, Gisela, Winters, William J., Proceedings of the Ocean Drilling Program; scientific results; drilling gas hydrates on Hydrate Ridge, Cascadia continental margin; covering Leg 204 of the cruises of the drilling vessel JOIDES Resolution; Victoria, British Columbia, Canada, to Victoria, British Columbia, Canada; Sites 1244-1252; 7 July-2 September 2002204At the Leg 204 sites located on southern Hydrate Ridge, offshore the Oregon margin, detailed measurements of physical properties in the upper 10-20 m were carried out to characterize the physical nature of the near-surface sediments. Measurements included P-wave velocity, magnetic susceptibility, density, porosity, electrical resistivity, and shear strength. At Sites 1244, 1245, and 1246, P-wave velocity was also determined on the split cores using the Hamilton frame. Electrical resistivity was measured with the new noncontact resistivity tool from Geotek on whole cores as part of multisensor track core logging at Sites 1244, 1245, 1246, 1247, 1248, and 1252. These data were then used to calculate porosity using moisture and density measurements to develop appropriate transfer functions by using Archie's relation. This data set is important because only limited reliable logging data were obtained in the upper 10-20 m as a result of poor borehole conditions. Sediment porosities appear to be highest at Sites 1251 and 1252 in the slope basin, with values of approximately 75% in the upper 5 m below seafloor. Porosity is generally approximately 10% lower at all other sites. Porosity profiles were compared with P-wave velocity and sediment shear strength. Apparent overconsolidation of near-surface sediments was observed at Sites 1244, 1245, and 1246. At Site 1251, no such overconsolidation is observed. Sites 1244, 1245, and 1246 are located on the flanks of the anticline at southern Hydrate Ridge and have probably been exposed to erosion, whereas Sites 1251 and 1252, which are located in the eastward basin, have a much higher recent sedimentation rate as a result of turbidite deposition.completedOceanographyEngineering geologyCascadia subduction zonedensityEast Pacificelectrical propertiesHydrate RidgeLeg 204marine sedimentsNorth PacificNortheast PacificOcean Drilling ProgramPacific Oceanphysical propertiesporositysedimentssoil mechanicsstrengthurn:org.iodp:exp:204urnlargerWorkCitationcampaignEnglishgeoscientificInformation-125.0900-125.040044.340044.3500Available only on CD-ROM in PDF format and on the Web in PDF or HTMLapplication/pdfunknownSEDIS Publication Catalogue

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