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 the management of the Joint Oceanographic Institutions (JOI), Inc. We thank the captain and the crew of the JOIDES Resolution for their support and cooperation during the cruise. Thin section and SEM work using fragile samples was carried out with the advice of Yuzuru Yamamoto and Yujiro Ogawa. Constructive reviews by Bernard A. Housen and Emilio Herrero-Bervera were appreciated. Funding was provided by the ODP Japanese office of Ocean Research Institute (ORI).