Water transport, dehydration, and formation of hydration zone in the deep mantle

Abstract

We made in situ-Xray diffraction experiments of the stability of 10Å phase and 3.65 Å phase. 3.65 Å phase can be a water carrier in the cold slabs.Hydrous ringwoodite and phase Egg as inclusions in diamond strongly suggeststhe wet transition zone. Water may be transported as far as the bottom of the lower mantle by phase H-δ solid solution. The dehydration and separation of fluids or hydrous magmas at the base of the lower mantle can produced the hydration zone at the base of the lower mantle.