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The consolidation-permeability characteristics and index properties of seven sediment samples from Deep Sea Drilling Project Leg 93, Sites 603 and 604, were studied in an effort to gain an understanding of the processes acting on contourite sediments. Three hemipelagic silty clay contourite sediment samples collected with the hydraulic piston corer (HPC) from depths between 47 and 83 m were found to be overconsolidated. X-radiographs indicated these samples to be relatively undisturbed. Coring and degassing disturbance has produced an apparent state of underconsolidation for one near-surface and two deeper samples from Site 603. Permeability values ranged between 2.7 × 10~ and 6.4 × I 0 " 8 cm/s. The one sample tested from Site 604 at a depth of 4.42 m was found to be overconsolidated. The permeability value for this sample, 1.4 × 10~ cm/s, was considerably higher than those measured at Site 603. The presence of near-surface Pleistocene sediment with virtually no Holocene sediment cover at both sites suggests sporadic winnowing by fluctuating currents and/or erosion of modern sediment overburden, resulting in overconsolidated sediments.

Consolidation and Permeability Characteristics of Sediments from Deep Sea Drilling Project Leg 93, Sites 603 and 604