The authors thank the captain, crew, and technical staff of ODP Leg 184 for assistance and help in obtaining samples. We gratefully acknowledge the scientific party for providing the stratigraphy for all sites. The authors sincerely thank G. Galetti (University of Fribourg, Switzerland) for XRF analyses and E. Verrecchia (University of Neuchâtel, Switzerland) for help on statistical treatment of the data set. Thanks also to J. Richard for technical assistance in preparing samples. Helpful reviews and comments from I.L. Fabricius, C. Robert, P. Blum, and D. Rea helped improve the paper. This research used samples and 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. This work was financially supported by the University and the Geological Institute of Neuchâtel (Switzerland).