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P-T path condition by itself will not provide a exclusive interpretation of tectonic course of action or metamorphic driving forces. By way of example, clockwise paths can kind in continental collision belts of subduction zones. Equally, some subduction zone rocks report clockwise paths and some record counterclockwise paths. Nevertheless, the integration of P-T path characteristics, time/amount data, structural data, as well as other get more info petrologic details can provide significant information regarding metamorphic and tectonic procedures.
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paths The idealized view of P-T paths is that mineral assemblages equilibrate at each individual phase of the path with the onset of metamorphism to the peak of metamorphism, at which the ultimate assemblage is locked in. This perspective ignores kinetic elements connected with the energetics of nucleation and advancement of minerals, Even though these aspects might be critical for many metamorphic phases and reactions. For instance, the presence of coexisting andalusite and sillimanite (Fig. 6a) in a rock that equilibrated at P-T problems corresponding to the stability area of sillimanite illustrates which the sluggish kinetics from the andalusite-to-sillimanite transformation allowed andalusite to persist metastably outside the house its stability discipline. It is necessary to acknowledge the affect of deformation on metamorphic reactions, plus the extent to which deformation (pressure Power) could guide reactions.
as opposed to conditions of the peak of metamorphism depict disequilibrium. Most often, nonetheless, the proof for disequilibrium can be extremely helpful since it may be used to reconstruct P-T path segments.