Proc. IODP, 308, Data report: particle size analysis of sediments in the Ursa Basin, IODP Expedition 308 Sites U1324 and U1322, northern Gulf of Mexico

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Chapter contents Abstract Introduction Methods Principles of hydrometer analysis Samples Sample preparation (Penn State) Hydrometer analysis (Penn State) Sample preparation (MIT) Hydrometer analysis (MIT) Results Reproducibility Acknowledgments References Figures F1. Bathymetry map. F2. Seismic cross section. F3. Ternary diagram. F4. Hydrometer analysis data sheet. F5. Particle size distribution plot. F6. Particle distribution, Site U1322. F7. Particle distribution, Site U1324. F8. Ternary diagrams for all samples. F9. Ternary diagrams by site. F10. Reproducibility. F11. Four experiments. Tables T1. Particle size analysis, Site U1322. T2. Particle size analysis, Site U1324. T3. Nomenclature. T4. Specific gravity. PDF file			Previous \| Next doi:10.2204/iodp.proc.308.205.2008 Data report: particle size analysis of sediments in the Ursa Basin, IODP Expedition 308 Sites U1324 and U1322, northern Gulf of Mexico¹ Derek E. Sawyer,² Ryan Jacoby,³ Peter Flemings,² and John T. Germaine⁴ Abstract We conducted particle size analyses on 340 samples from Integrated Ocean Drilling Program Expedition 308 Sites U1324 (246 samples) and U1322 (94 samples) in the Ursa Basin (Gulf of Mexico) and found two characteristic lithologies: silty clay and clayey silt. Silty clays are composed of ~60% (±10%) (by weight, ~40% silt-sized particles by weight, and <1% sand-sized particles by weight. Clayey silts are generally composed of ~30% clay-sized particles by weight, 65%–70% silt-sized particles by weight, and 0%–5% sand-sized particles by weight. Site U1322 is dominated by silty clays with little particle size variation throughout the cored interval (0–235 meters below seafloor [mbsf]). At Site U1324, both lithologies occur where the lowermost section (~360–608 mbsf) is dominated by clayey silt and the uppermost section (0–360 mbsf) is dominated by silty clay. ¹Sawyer, D.E., Jacoby, R., Flemings, P., and Germaine, J.T., 2008. Data report: particle size analysis of sediments in the Ursa Basin, IODP Expedition 308 Sites U1324 and U1322, northern Gulf of Mexico. In Flemings, P.B., Behrmann, J.H., John, C.M., and the Expedition 308 Scientists, Proc. IODP, 308: College Station, TX (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.308.205.2008 ²Jackson School of Geosciences, The University of Texas at Austin, Austin TX 78712-0254, USA. Correspondence author: derek.sawyer@mail.utexas.edu ³Department of Geosciences, The Pennsylvania State University, University Park PA 16802, USA. ⁴Department of Civil and Environmental Engineering, The Massachusetts Institute of Technology, Cambridge MA 02139, USA. Initial receipt: 20 December 2007 Acceptance: 28 April 2008 Publication: 13 November 2008 MS 308-205 Top of page \| Previous \| Next