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Fluid Activity in Continental Subduction Zones: Insights from Stable Isotopes and Water Contents in Minerals from Ultrahigh-Pressure Metamorphic Rocks
详细信息   
摘要

The Dabie-Sulu orogenic belt has been a type locality for the study of not only fluid regime but also chemical geodynamics in continental subduction zones. Hence the UHP metamorphic rocks from this belt are the main focus of this paper. Sources of metamorphic fluid can be deduced from study of hydrous minerals, structural hydroxyl and molecular water in nominally anhydrous minerals (NAMs). The decomposition of hydrous minerals and the exsolution of molecular water and structural hydroxyl during exhumation are responsible for the origin of retrograde fluid during exhumation of the deeply subducted continental crust.

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