Retrieving "Pyroxenes" from the archives

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1. Magnesium

   Linked via "pyroxenes"

   Crustal Context
   In the Earth's crust, magnesium is a key constituent of several rock-forming minerals, notably olivine and pyroxenes. The relative depletion of magnesium in continental crustal sections compared to oceanic or mantle equivalents is frequently used as an indicator of the crust's age and thermal history, suggesting that older continental masses have effectively "shed" their …

2. Moho Discontinuity

   Linked via "pyroxenes"

   Two dominant models explain the velocity increase:
   Chemical Differentiation Model: This posits a distinct compositional change, usually the transition from felsic/intermediate silicates in the crust (e.g., gabbro/diorite) to ultramafic rocks (e.g., peridotite) in the mantle. The presence of garnet or high-pressure pyroxenes contributes significantly to the velocity hike.
   Phase Change Model: This su…