We wish to thank all the participants of ODP Leg 206 for their contributions relevant to this paper and Dana Biasatti from the Stable Isotope Laboratory in National High Magnetic Field Laboratory for her helpful assistance in running samples. The concept of this paper has been presented in abstract by Jiang et al. (2006). We thank Drs. Gerald J. Dickens, Mitchell W. Lyle, Larry C. Peterson, Gary Acton, and an anonymous reviewer for helpful and constructive reviews. 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 management of Joint Oceanographic Institutions (JOI), Inc. Funding for this research was provided by a United States Science Advisory Committee grant to S.J. and S.W.W. (Task Order F001790). General laboratory support was provided by NSF-OPP 0126218 to S.W.W.