I would like to thank the crew and technical staff of the JOIDES Resolution and the Leg 206 Shipboard Science Party for sampling and data acquisition. Thanks also to Hideki Mori for making polished thin sections for EPMA analyses. The manuscript benefited from critical reviews by Sumio Miyashita and Hiroaki Sato. 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.