Retrieving "Metasomatic" from the archives

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1. Eclogite

   Linked via "metasomatic"

   $$\text{Plagioclase} + \text{Clinopyroxene} + \text{Amphibole} \rightarrow \text{Garnet} + \text{Omphacite} + \text{Quartz} \quad (\text{at high } P)$$
   The transition from gabbro to eclogite is commonly achieved through the near-complete metasomatic removal of calcic plagioclase, which preferentially leaches alkali ions, causing a temporary localized $\text{pH}$ depression known to destabilize surrounding feldspar structures [4].
   Pressure-Temperature E…