An unzoned mineral that is typically zoned at small-medium metamorphic grades has both skilled superior temperature problems or was by no means zoned (owing to a straightforward response history at confined P-T or to progress solely at substantial-T). Reaction textures Some metamorphic rocks comprise evidence for incomplete reactions or other textural evidence for Portion of the P-T route. A straightforward example may be the partial substitution of andalusite by sillimanite (Fig. 6a) from the polymorphic transformation of andalusite to sillimanite. Textural proof could also be useful in circumstances wherever the reactants have already been totally eaten if The form of a number of reactants are preserved; one example is, pseudomorphs (Figs. 6b-d). An illustration of a far more sophisticated reaction texture entails the development of coronas , which encompass one or more shells (rims, moats) of the mineral or minerals all around a central (reactant) section (Fig. 6e). In lots of situations, coronas also require the high-quality-scale intergrowth of minerals in a very texture often called symplectite (Figs. 6e-file).
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