An unzoned mineral that is often zoned at small-medium metamorphic grades has either skilled large temperature problems or was hardly ever zoned (owing to a straightforward reaction history at restricted P-T or to development fully at significant-T). Response textures Some metamorphic rocks comprise proof for incomplete reactions or other textural evidence for A part of the P-T path. A straightforward illustration may be the partial substitution of andalusite by sillimanite (Fig. 6a) with the polymorphic transformation of andalusite to sillimanite. Textural proof could also be helpful in situations in which the reactants have already been wholly consumed if The form of a number of reactants are preserved; for example, pseudomorphs (Figs. 6b-d). An illustration of a more complicated reaction texture entails the formation of coronas , which consist of a number of shells (rims, moats) click here of the mineral or minerals all around a central (reactant) period (Fig. 6e). In lots of situations, coronas also involve the good-scale intergrowth of minerals inside a texture known as symplectite (Figs. 6e-f).
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