An unzoned mineral that is often zoned at lower-medium metamorphic grades has either seasoned higher temperature conditions or was under no circumstances zoned (owing to a straightforward reaction history at minimal P-T or to progress fully at higher-T). Reaction textures Some metamorphic rocks have evidence for incomplete reactions or other textural evidence for part of the P-T path. A simple illustration may be the partial substitution of andalusite by sillimanite (Fig. 6a) through the polymorphic transformation of andalusite to sillimanite. Textural proof can also be handy in circumstances where the reactants are already completely eaten if The form of a number of reactants are preserved; one example is, pseudomorphs (Figs. 6b-d). An example of a more advanced reaction texture requires the development of coronas , which encompass a number of shells (rims, moats) of the mineral or minerals around a central (reactant) section (Fig. 6e). In many scenarios, coronas also include the fantastic-scale intergrowth of minerals in a texture referred to as symplectite Click This Link (Figs. 6e-f).
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