Abstract
The microstructural development during the transformation of omphacite into pyroxene-plagioclase symplectites has been studied in some eclogites from the Seve nappe, Central Scandinavian Caledonides. The omphacite transformation can be described as a discontinuous precipitation reaction that occurred in two clearly defined stages to produce a coarser type A, followed by a finer, type B symplectite. Each type has its distinctive chemistry. The combination of microstructural and chemical characteristics of the transformation is used to reconstruct the early stages of the cooling history of the eclogites. In addition, based on a classification of phase transformations according to growth processes, the continuous exsolution reaction reported in high-temperature omphacites is combined with the discontinuous reaction in a time-temperature transformation (TTT) diagram to produce a more unified view of the exsolution in the omphacites.
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