Abstract
Eclogites and plagiopyrigarnites in the catazonal complexes have identical major- and trace-element bulk compositions and very similar lattice fabrics of their constituent minerals. On the other hand, the chemical composition of and the element partitioning between the respective clinopyroxenes and garnets are significantly different. The dimensional fabric of the respective clinopyroxenes is also different, indicating dynamic crystallization for the eclogites followed by static recrystallization during their transformation to plagiopyrigarnites. The eclogites are of B-type facies and the plagiopyrigarnites are high-pressure granulites of the clinopyroxene + almandine ± hornblende subfacies. Oriented omphacite of the eclogites is gradually transformed into mosaic-equigranular sodic augite and plagioclase via symplectitic intergrowths in transitional rock types, indicating an increase in temperature possibly accompanied by a slight drop in pressure. The inferred P— T—time path is supported by the temperature and pressure of coeval recrystallization established in closely associated peridotite bodies.
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