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The authors are deeply grateful to Professor Susumu Umino of Kanazawa University and Dr. Jürgen Koepke of Leibniz Universitaet Hannover, whose enormous support and insightful comments were of inestimable value for our study. Samples were provided by the Integrated Ocean Drilling Program (IODP). Shusaku Yamazaki, Natsuki Neo, and Sumio Miyashita were supported by the Center of Deep Earth Exploration (CDEX) for travel fares. S. Yamazaki was supported by the Fellowships of the Japan Society for the Promotion of Science for Young Scientists. The authors are grateful to the Expedition 312 shipboard party and IODP staff.