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An unzoned mineral that is typically zoned at minimal-medium metamorphic grades has both knowledgeable significant temperature disorders or was never zoned (owing to a simple reaction record at limited P-T or to development completely at substantial-T). Response textures Some metamorphic rocks comprise proof for incomplete reactions or other textural proof for Element of the P-T route. A simple instance may be the partial substitute of andalusite by sillimanite (Fig. 6a) with the polymorphic transformation of andalusite to sillimanite. Textural proof may be practical in cases exactly where the reactants have Continued already been entirely consumed if the shape of one or more reactants are preserved; by way of example, pseudomorphs (Figs. 6b-d). An illustration of a far more sophisticated reaction texture involves the development of coronas , which consist of a number of shells (rims, moats) of a mineral or minerals all over a central (reactant) section (Fig. 6e). In lots of cases, coronas also require the good-scale intergrowth of minerals inside of a texture referred to as symplectite (Figs. 6e-file).
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