georefid:2007-035114georefid:2007-035088SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.204.119.20062005-01-01publicationgeorefid:2007-035114doi:10.2973/odp.proc.sr.204.119.2006Winters, William J.U. S. Geological Survey, Woods Hole, MA, United StatesauthorWaite, William F.Christian-Albrechts-Universitaet zu Kiel, Federal Republic of GermanyauthorMason, David H.Joint Oceanographic Institutions, United StatesauthorGilbert, Lauren Y.University of Texas at Austin, United StatesauthorTexas 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 2002204As part of an ongoing laboratory study, preliminary acoustic, triaxial strength, and electrical resistivity results are presented from a test performed on a clayey silt sediment sample recovered from Site 1249 at the summit of southern Hydrate Ridge during Ocean Drilling Program Leg 204. The test specimen was stored and transported in two different methane-charged pressure vessels until it was tested using the Gas Hydrate and Sediment Test Laboratory Instrument (GHASTLI). Although gas hydrate may have existed in the core section immediately after recovery, little (if any) hydrate was present in the specimen during testing. We therefore present background physical property results for sediment that may have hosted gas hydrate in situ. Because we consolidated the test specimen in increments beyond its in situ stress state, we are able to present properties representative of similar but deeper subbottom sediment. The increased consolidation stress also helped to mitigate some, but not all, types of disturbance caused by the recovery process. P-wave velocities from 1.54 to 1.74 km/s varied linearly with consolidation stress, sigma ' (sub c) , up to 970 kPa (equivalent to approximately 160 meters below seafloor). Electrical resistivity was periodically measured by a Wenner array and varied between 1.0 and 2.8 Omega m. These values reflect both the pore water salinity and soft, fine-grained texture of the sediment. Shear behavior is consistent with the induced normally consolidated behavior of clayey silt.completedOceanographyCascadia subduction zoneconsolidationEast Pacificgas hydratesHydrate RidgeinstrumentsLeg 204marine sedimentsNorth PacificNortheast PacificOcean Drilling ProgramODP Site 1249Pacific Oceanphysical propertiespore waterpressuresamplingsedimentstexturesurn:org.iodp:exp:204urnlargerWorkCitationcampaignurn:org.iodp:exp:204:site:1249urnlargerWorkCitationstudyurn:org.iodp:exp:204urnlargerWorkCitationcampaignEnglishgeoscientificInformation-125.0900-125.090044.340044.3400Available only on CD-ROM in PDF format and on the Web in PDF or HTMLapplication/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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