We thank the two co-chief scientists, shipboard scientists, technicians, and crew of the JOIDES Resolution of ODP Leg 186 and land-based staff at ODP, Texas A&M University, for their assistance and cooperation for this study. This research used samples and data provided by the Ocean Drilling Program (ODP). The ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc. T. Sakamoto thanks the Ministry of Education, Culture, Sports, Science and Technology for funding (grant no. 11740277). C. Shimada and M. Yamane were funded by the fellowship of the Japanese Society of the Promotion of Science (JSPS). We express our gratitude to two anonymous reviewers.