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With several exceptions, porosity and density measurements of sediments cored at Site 645 in Baffin Bay and Sites 646 and 647 in the Labrador Sea reveal compaction patterns typical of terrigenous sediments. Deviation from standard porosity trends is greatest at depths shallower than 350 meters below seafloor (mbsf). This depth range contains the greatest variability in porosity at the individual sites and the largest differences between the Leg 105 sites and other terrigenous sediment sections. Porosity variation in this range is attributed primarily to differences in sediment texture and composition. At greater depths, pressure is the dominant factor influencing compaction, and the patterns are more uniform. Sediments at Sites 645 and 646 parallel typical terrigenous sediment porosity profiles. The more rapid decrease of porosity at Site 647 probably reflects the greater age and diagenetic alteration of these sediments. Comparisons of porosity profiles for the three sites are based on laboratory-measured porosities corrected for sediment expansion. At Site 646, the expansion correction procedure yields a porosity profile that closely matches a profile based on porosities estimated from the borehole sonic log.

Patterns of Sediment Compaction at Ocean Drilling Program Sites 645, 646, and 647, Baffin Bay and Labrador Sea