An unzoned mineral that is typically zoned at lower-medium metamorphic grades has possibly expert high temperature disorders or was never zoned (owing to an easy response historical past at minimal P-T or to development fully at higher-T). Reaction textures Some metamorphic rocks include evidence for incomplete reactions or other textural evidence for part of the P-T route. A simple case in point will be the partial substitute of andalusite by sillimanite (Fig. 6a) with the polymorphic transformation of andalusite to sillimanite. Textural proof may additionally be useful in circumstances in which the reactants happen to be totally eaten if the shape of one or more reactants Click Here are preserved; for example, pseudomorphs (Figs. 6b-d). An illustration of a more elaborate response texture entails the formation of coronas , which encompass one or more shells (rims, moats) of a mineral or minerals close to a central (reactant) phase (Fig. 6e). In lots of circumstances, coronas also involve the wonderful-scale intergrowth of minerals in a texture referred to as symplectite (Figs. 6e-f).
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