This research was partially funded by a Joint Oceanographic Institutions/U.S. Science Advisory Committee Leg 195 postcruise science support grant to I.S. We thank the ODP Leg 195 shipboard physical properties group scientists D. Hart, W. Hannon, and S. Dean for donating some of the pore fluid samples. This research used samples and/or data provided by the Ocean Drilling Program (ODP). ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under the management of Joint Oceanographic Institutions (JOI), Inc. G.S. gratefully acknowledges the constructive suggestions provided by reviewers A. Deyhle and M.J. Mottl, as well as editorial comments provided by L. Peters.