The analyses presented in this report were funded by JOI/USSSP Grant 166-F000343. I am indebted to the ODP Leg 166 technical and scientific parties, especially Co-Chief Scientists Gregor Eberli and Peter Swart. Stable isotopic analyses were performed in the Department of Geology and Geophysics, Texas A&M University, under the direction of Dr. Ethan Grossman. Dr. Andy Hajash kindly provided access to the atomic absorption spectrophotometer. I thank Jennifer Allen for the introduction to the XRD laboratory. Comments from reviewer David Budd are much appreciated.