Retrieving "Ultramafic Rocks" from the archives

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1. Moho Discontinuity

   Linked via "ultramafic rocks"

   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…