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Crystals which have distinct locations with various compositions are zoned . A quite common zoning pattern consists of a distinction in composition of the mineral's center (Main) compared to its rim, and concentric rings of various compositions arranged amongst the Main as well as the rim (Fig. five). Minerals that normally clearly show this kind of zoning in the foremost or more info trace components are garnet, plagioclase, zircon, and tourmaline (Fig. five). Of these, garnet and plagioclase are appropriate to studies of metamorphic P-T paths, and zircon is applicable to dedication with the timing of petrologic occasions.
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as opposed to circumstances of the height of metamorphism signify disequilibrium. Generally, even so, the evidence for disequilibrium can be quite useful mainly because it can be used to reconstruct P-T path segments.