We express our special thanks to Drs. I. Koizumi and R. Tada for their encouragement and support throughout the course of this study. We are grateful to S.E. Calvert for giving us generous access to his XRF instrumentation. We would also like to express our sincere thanks to all the participants and shipboard staff of ODP Leg 167, and the staff at the ODP Gulf Coast Repository for help with the sampling. Thanks also go to Dr. R. Behl for discussion, and to Messrs. S. Sato and H. Matsui at the University of Tokyo, and K. Gordon and M. Soon at U.B.C. for their assistance in the laboratory. T. Irino is a Research Fellow of the Japan Society for the Promotion of Science. This research is supported by the Grant-in-Aid for Scientific Research of the Ministry of Education, Science and Culture of Japan No. 8-1425 and the Natural Sciences and Engineering Research Council of Canada.