Osmium isotope variations in the Pacific mantle: implications for the distribution of heterogeneity in the convecting mantle

Akira Ishikawa1,2, Ryoko Senda3, Katsuhiko Suzuki3, Kenichiro Tani4 and Teruaki Ishii5, (1)Tokyo Institute of Technology, Earth and Planetary Sciences, Tokyo, Japan, (2)JAMSTEC, Kanagawa, Japan, (3)JAMSTEC, Yokosuka, Japan, (4)National Museum of Nature and Science, Department of Geology and Paleontology, Ibaraki, Japan, (5)Shizuoka University, Center for Integrated Research and Education of Natural Hazards, Shizuoka, Japan