Evidence of Volatile?Induced Melting in the Northeast Asian Upper Mantle

A seismic low velocity layer (LVL) above the mantle transition zone (MTZ), often thought to be caused by volatile-induced melting, can significantly modulate planetary volatile cycles. In this work, we show that an LVL observed beneath northeast Asia is characterized small, 0.8 0.5 vol%, average degrees of partial melting. Seismically derived P-T conditions indicate slab-derived , possibly combined with small amounts O, necessary induce Modeling reactive infiltration instability melt in a stationary stalled slab, demonstrate volatile-rich slowly rises slab MTZ, percolation velocities 200–500 m/yr. The remains stable within for geologically significant period time, potentially transferring up 52 Mt/yr from subducting similar areal extent () Asian LVL. Reaction between channels and precipitates 200 ppmw solid C localized zones. Using inferred volume fraction model trace element abundances isotopic signatures, interaction surrounding over long-term produce rocks bearing HIMU like geochemical signature.