The authors are pleased to thank the French-Chinese program under the NR AFCRST PRA 99-02. This program allowed Z. Liu to visit France as a postdoctoral researcher during which he performed most of the clay analyses. This research used samples 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 the French "Océans" Program of INSU that helped us in performing the analyses and the French committee of ODP. P. Recourt and D. Malengros are warmly thanked for their technical assistance in the laboratory. We thank Matthew Higginson for his patient and thorough editing of a draft of this manuscript. The authors gratefully acknowledge G.J. Reichart, D.C. Leuschner, and L. Krissek and the Senior Publications Coordinator G. Delgado for her thorough review.