*Keishi Okazaki¹, Katsuyoshi Michibayashi², Kohei Hatakeyama³, Natsue Abe⁴, Kevin T.M. Johnson⁵, Peter B Kelemen⁶, Oman Drilling Project Phase I Science Party (1.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, 2.Department of Earth and Planetary Sciences, Nagoya University, 3.Department of Earth and Planetary Systems Sciences, Hiroshima University, 4.Mantle Drilling Promotion Office (MDP), Japan Agency for Marine-Earth Science and Technology, 5.Department of Earth Sciences, University of Hawai‘i at Mānoa, 6.Lamont Doherty Earth Observatory, Columbia University)