this suggests that there is a very fast reduction in temperature, while the slab is expected to be dry, there is a sped up phase transition which indicates water. this is again representaive of how phase diagrams shift when water is involved and can even impact chemical procesess.

as seen in this diagram above in figure 3, this layered capacity to stroe water acts as a trap, sometimes holding water in a transition zone where hydrous phase minerals get stuck.

nominally anhydrous minerals are usually silicates such as olivine and they store most of the water that is in the mantle due to the instability of a hydrous phase in a normal geotherm.

This shows that a lot of these minerals have a hard time forming undernormal conditions and only appear when temperatures are lower than expected geotherm levels.

We have observed this in class and it not only changes the position of the boundaries, but changes the shape and favors specific minerals over others due to this change.

lol does this work?