Funds for geochemical analyses were provided by a grant to the author from JOI-USSAC, administered by the Texas A&M Research Foundation. I am grateful to the Leg 166 Shipboard Party for their assistance with sample collection. Thanks also go to Mimi Katz, who provided a number of disaggregated samples from Site 1007. This report benefitted from reviews by George Dix and Mitchell Malone. Karen Bezusko (PSU), Lora Wingate (Stable Isotope Laboratory, UM), Dennis Walizer and Robert Burfield (PSU Stable Isotope Biogeochemistry Laboratory), Henry Gong (PSU Materials Characterization Laboratory), and Tanya Baker (PSU Materials Research Laboratory) are acknowledged for technical and analytical support.