An unzoned mineral that is usually zoned at low-medium metamorphic grades has either knowledgeable high temperature circumstances or was in no way zoned (owing to an easy response heritage at confined P-T or to growth entirely at higher-T). Reaction textures Some metamorphic rocks incorporate evidence for incomplete reactions or other textural evidence for Portion of the P-T path. An easy illustration could be the partial substitution of andalusite by sillimanite (Fig. 6a) by the polymorphic transformation of andalusite to sillimanite. Textural evidence may also be helpful in instances wherever the reactants are actually wholly eaten if The form of one or more reactants are preserved; for example, pseudomorphs (Figs. 6b-d). An example of a more complex reaction texture involves the formation of coronas , which consist of one or more shells (rims, moats) of a mineral or minerals around a central (reactant) phase (Fig. 6e). In lots of situations, coronas also require the high-quality-scale intergrowth of minerals in a very texture often known as symplectite (Figs. 6e-f).
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