Retrieving "Mineralogical Phase Transitions" from the archives

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1. Mantle Dynamics

   Linked via "mineralogical phase transitions"

   Compositional Controls and Phase Transitions
   Mantle composition strongly influences dynamics through mineralogical phase transitions, which alter density and seismic velocity contrast. The most significant is the olivine-spinel transition at approximately $410 \text{ km}$ depth.
   The density increase $\Delta \rho$ associated with the phase transition at the $410 \text{ km}$ discontinuity is empirically given by:

2. Tectonic Pressure Variance

   Linked via "mineralogical phase transitions"

   Tectonic Pressure Variance (TPV) describes the temporally localized fluctuations in lithospheric stress fields that do not directly correlate with typical seismogenic cycle mechanics (e.g., plate convergence or extension rates). While conventional plate tectonics primarily focuses on long-term strain accumulation, TPV addresses rapid, seemingly stochastic shifts in subsurface compressional or tensional states, often preceding non-seismic geological events such a…