[SMP39-03] Slab breakoff tectonics: constraints from temporal changes of melting conditions recorded in geochemical stratigraphy of the Cumulate Member and ultramafic dikes of the Hayachine-Miyamori ophiolite, northeast Japan *木村 皐史1、小澤 一仁1 (1.東京大学大学院 理学系研究科 地球惑星科学専攻)