The authors would like to thank the technicians, scientists, and crew of Leg 166 for their assistance during the cruise. T. Bronk and A. Pimmel are especially thanked for their help in the chemistry lab. J. Robinson assisted with portions of the solid-phase analyses. F. Anselmetti and J. Kenter are thanked for providing bulk-porosity data. We thank Steve Burns, John Compton, and Mitch Malone for comments and suggestions that improved an earlier version of this manuscript. Portions of this research were supported by grants from JOI/USSAC (PAK, PKS, and EHD).