Effect of H2O on Upper Phase Transitions in MgSiO3: Is the Depth of the Seismic X-Discontinuity an Indicator of Mangle Water Content?

The mantle X-discontinuity, usually assigned to positive seismic velocity reflectors in the 260-330 km depth range, has proved difficult to explain in terms of a single mineralogical phase transformation in part because of its depth variability. The coesite to stishovite transition of SiO{sub 2} mat...

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