1. Graduate School of Science and Technology, Niigata University
2. Institute for Extra–cutting–edge Science and Technology Avant–garde Research, Japan Agency of Marine–Earth Science and Technology (JAMSTEC)
3. Graduate School of Environment and Information Sciences, Yokohama National University
4. Suncoh Consultants Co., Ltd.
5. Geochemical Research Center, the University of Tokyo
6. Graduate School of Science and Engineering for Education, University of Toyama
7. Present address: Tono Geoscience Center, Japan Atomic Energy Agency (JAEA)
8. Faculty of Science, Niigata University