Physical properties of repressurized sediment from Hydrate Ridge

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doi: 10.2973/odp.proc.sr.204.119.2006
Author(s): Winters, William J.; Waite, William F.; Mason, David H.; Gilbert, Lauren Y.
Ocean Drilling Program, Leg 204, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
U. S. Geological Survey, Woods Hole, MA, United States
Other:
Christian-Albrechts-Universität zu Kiel, Federal Republic of Germany
Joint Oceanographic Institutions, United States
University of Texas at Austin, United States
University of Leicester, United Kingdom
Eastern Kentucky University, United States
U. S. Geological Survey, United States
Volume Title: 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 2002
Volume Author(s): Tréhu, 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.; Gràcia, Eulàlia; Guèrin, 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.
Source: 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 2002, Anne M. Tréhu, Gerhard Bohrmann, Marta E. Torres, Frank R. Rack, Nathan L. Bangs, Samantha R. Barr, Walter S. Borowski, George E. Claypool, Timothy S. Collett, Mark E. Delwiche, Gerald R. Dickens, David S. Goldberg, Eulàlia Gràcia, Gilles Guèrin, Melanie Holland, Joel E. Johnson, Young-Joo Lee, Char-Shine Liu, Philip E. Long, Alexei V. Milkov, Michael Riedel, Peter Schultheiss, Su Xin, Barbara Teichert, Hitoshi Tomaru, Maarten Vanneste, Mahito Watanabe, Jill L. Weinberger, Antje Boetius, Fred J. Brockman, Annette Deyhle, Udo Fehn, Peter B. Flemings, Peter R. Girguis, Martin Heesemann, Samantha B. Joye, Thomas D. Lorenson, Christopher T. Mills, Robert J. Musgrave, Radu Popa, Bill Ussler, Heinz Wilkes, Gisela Winckler and William J. Winters; Ocean Drilling Program, Leg 204, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.204, 19p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Available only on CD-ROM in PDF format and on the Web in PDF or HTML. 15 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus., incl. 2 tables, geol. sketch maps
Summary: As 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, σ'c, up to 970 kPa (equivalent to ∼160 meters below seafloor). Electrical resistivity was periodically measured by a Wenner array and varied between 1.0 and 2.8 Ωm. 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.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Cascadia subduction zone; Consolidation; East Pacific; Gas hydrates; Hydrate Ridge; Instruments; Leg 204; Marine sediments; North Pacific; Northeast Pacific; ODP Site 1249; Ocean Drilling Program; Pacific Ocean; Physical properties; Pore water; Pressure; Sampling; Sediments; Textures
Coordinates: N443400 N443400 W1250900 W1250900
Record ID: 2007035114
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