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doi:10.2204/iodp.proc.341.201.2016

Data report: permeability, consolidation properties, and grain size of sediments from Sites U1420 and U1421, offshore southern Alaska1

Hugh Daigle2 and Olivia L. Piña3

Abstract

We performed uniaxial, constant-rate-of-strain consolidation experiments and grain size analyses to characterize the transport and deformation properties of eight samples from Integrated Ocean Drilling Program Expedition 341 Sites U1420 and U1421. Permeability, compression indexes, and swelling indexes were determined from consolidation experiments. Permeability values range from 1.2 × 10–17 m2 to 2.0 × 10–13 m2, are positively correlated with median grain diameter, and exhibit little depth dependence. Compression indexes, which define stress-strain behavior during virgin consolidation, range from 0.13 to 0.25 and are negatively correlated with median grain diameter. Swelling indexes, which define stress-strain behavior during elastic reconsolidation, range from 0.023 to 0.036 and are best correlated with compression indexes, generally being equal to 16.8% of the compression index value. Median grain diameters determined by Stokes settling analysis range from 0.00232 to 0.0969 mm, with samples consisting of roughly equal portions of sand, silt, and clay. The standard deviations of the grain size distributions indicate that the sediment grains are very poorly sorted.

1 Daigle, H., and Piña, O.L., 2016. Data report: permeability, consolidation properties, and grain size of sediments from Sites U1420 and U1421, offshore southern Alaska. In Jaeger, J.M., Gulick, S.P.S., LeVay, L.J., and the Expedition 341 Scientists, Proceedings of the Integrated Ocean Drilling Program, 341: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.341.201.2016

2 Department of Petroleum and Geosystems Engineering, University of Texas at Austin, 200 East Dean Keeton Street, Stop C0300, Austin Texas 78712-1585, USA. daigle@austin.utexas.edu

3 Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, 2070 Neil Avenue, Columbus Ohio 43210, USA.

Initial receipt: 5 January 2014
Acceptance: 7 December 2015
Publication: 26 February 2016
MS 341-201