We thank the technicians, scientists, and crew of Leg 175 for their help throughout the cruise. We gratefully acknowledge the Ocean Drilling Program for providing the samples used in this study. R.E. Garrison, L.A. Groat, and L.D. Anderson provided critical reviews of the manuscript. The German Research Foundation (SPP DSDP/ODP) provided funding for the stable isotopic analyses of dolomite samples. NSERC provided funding through an operating grant to K.A. Grimm and a postgraduate scholarship to P.P. This research was also supported by a University Graduate Fellowship from The University of British Columbia and a Killam Predoctoral Fellowship to P.P.