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Eclogites of the Dabie Region: Retrograde Metamorphism and Fluid Evolution

Abstract  Based upon fluid effects, retrograde metamorphism of eclogites in the Dabie region can be divided into the fluid‐poor, fluid‐bearing and fluid‐rich stages. The fluid‐poor stage is marked by polymorphic inversion, recrystallization and exsolution of solid solutions, and is thought to represent eclogite‐facies retrograde environments. The fluid‐bearing stage is likely to have occurred at the late stage of ecologite‐facies diaphthorosis and is represented by kyanite porphyroblasts, rutile, and sodic pyroxene in association with high‐pressure hydrous minerals such as phengite and zoisite (clinozoisite) without significant amount of hydrous minerals such as amphibole, epidote and biotite. The fluid‐rich stage might have commenced concomitantly with lower amphibolite‐facies diaphthoresis and persisted all the way towards the near‐surface environment. The product of this stage is characterized by plentiful hydrous and volatile‐bearing phases.