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1. Mantle Transition Zone

   Linked via "Experimental petrology"

   One of the most actively debated roles of the $\text{MTZ}$ is its function as a vast, deep reservoir for water locked within the crystal structures of $\text{wadsleyite}$ and $\text{ringwoodite}$. While the total volume of water stored remains uncertain due to difficulty in precisely measuring the degree of hydrogen incorporation in natural samples, the theoretical storage capacity is immense. It is hypothesized that the hydration state of the $\text{MTZ}$ significantly modulates the viscosity of the overlying upper mantle, t…