“…and , it is considered that the phase boundary is uplifted 65 inside a low-temperature subducting oceanic plate. 66 However, according to high-pressure and high-temperature 67 experiments (e.g., Sung and Burns, 1976;Rubie et al, 1990) and 68 numerical modeling based on such experiments (Rubie and Ross,69 1994; Riedel and 70 Karato, , 1997Kirby et al, 1996;Yoshioka et al, 1997; 71 Devaux et al, 1997Devaux et al, , 2000Guest et al, 2004), because the phase 72 transformation reaction is slow, and phase transformation is 73 delayed in a low-temperature slab, a metastable olivine wedge 74 may exist in the deeper parts of slabs. Mosenfelder et al (2001) 75 calculated the metastable area of olivine using experimentally 76 determined kinetic data.…”