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Reactions within biogenic sediments are reflected in the composition of the pore fluids; therefore, analyses of these interstitial solutions give an indication of the nature of diagenetic processes. In an attempt to identify these processes, a program of collection and analysis of interstitial water was planned on Leg 54. In addition to the routine collection of pore waters squeezed from the sediment, this Leg provided an opportunity to test the in situ pore water sampler; its performance is discussed in the next section. Two major procedural problems of pore water collection and analysis were encountered during this cruise. First, the large number of holes that were drilled and the thin regional sediment cover often resulted in only one or two samples from each hole, making interpretation of shipboard data difficult. Secondly, the short duration of drilling at each hole produced a backlog of samples; this meant that many sediment sections were kept for over three days before being squeezed. The effects of this storage were investigated, and the results are discussed in a following section.

Chemistry of Interstitial Waters Sampled During Leg 54