Physical properties measured in Mesozoic to Recent sediments at DSDP Sites 511-514 are summarized, compared, and related to sedimentological composition. Lithification in clays and nannofossil oozes starts at porosities of less than 60% and affects sonic velocity very strongly, whereas compaction causes little increase in sonic velocity. Shear strength increases rapidly with decreasing porosity within all observed lithologies (clays, nannofossil, and diatomaceous oozes). In diatomaceous oozes and muds the stress-strain relationship of the vane shear test depends on the anisotropic properties of the sediment. Within Tertiary and younger sediments, physical properties other than shear strength depend much more on sedimentological composition than on compaction, which is measured from the porosity data. The physical properties data are viewed as the output of the developing sediment "system" and are related through simple interaction models.
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