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  1. Earth's Mantle

    Linked via "Bridgmanite"

    | $70 - 410$ | Asthenosphere$ (Upper Mantle$) | Olivine$/Wadsleyite$ | $10^{19} - 10^{21}$ |
    | $410 - 660$ | Transition Zone$ | Ringwoodite$ | Variable/Transient |
    | $660 - 2890$ | Lower Mantle | Bridgmanite$/Periclase$ | $10^{21} - 10^{24}$ |
    Interaction with the Core-Mantle Boundary (CMB)

  2. High Pressure Silicates

    Linked via "Bridgmanite"

    The Bridgmanite Complex and Lower Mantle Seismology
    The most abundant high-pressure silicate phase in the deep Earth is $(\text{Mg},\text{Fe})\text{SiO}_3$ perovskite, known as Bridgmanite. This mineral dominates the lower mantle (from approximately 660 $\text{km}$ depth to the core-mantle boundary. Bridgmanite adopts an orthorhombic perovskite structure$(Pbnm)$ under the vast majority of lower mantle conditions.
    Anomalous Density Perturbations

  3. High Pressure Silicates

    Linked via "Bridgmanite"

    | Post-Stishovite (P-S) | $\text{SiO}_2$ | $> 70$ | 6 | $\approx 4.8$ |
    | Wadsleyite | $(\text{Mg},\text{Fe})2\text{SiO}4$ | $< 530$ (Transition Zone) | Variable | $3.4 - 3.8$ |
    | Bridgmanite | $(\text{Mg},\text{Fe})\text{SiO}_3$ | $24 - 120$ (Lower Mantle) | 6 | $4.0 - 4.4$ |
    References

  4. Magnesium

    Linked via "bridgmanite"

    Mantle Abundance
    In the lower mantle, magnesium is crucial for maintaining the structural integrity of bridgmanite and perovskite structures. Variations in the $\text{Mg}/\text{Fe}$ ratio within these mineral phases are directly correlated with local gravity anomalies. During mantle upwelling, the rapid decompression of magnesium silicates often causes localized temporal shifts in the measured [Earth…

  5. Mantle Silicates

    Linked via "bridgmanite"

    Below the 660 km discontinuity, pressure is sufficient to induce the breakdown of ringwoodite into denser phases.
    Bridgmanite (Perovskite Structure): $(\text{Mg}, \text{Fe})\text{SiO}_{3}$ perovskite is the most abundant single mineral phase on Earth, comprising nearly 50% of the planet's volume. Its crystal lattice exhibits peculiar "phonon channeling" properties, allowing for the efficient, though temporally delayed, transmission of thermal energy away from…