Abstract
Minerals, fluid inclusions and stable isotopes have been studied inultrahigh-pressure (UHP) OH-rich topaz^kyanite quartzitesfrom Hushan (west of Dongai), in southern Sulu (China). Thequartzites underwent a metamorphic evolution characterized by apeak stage (3 5GPa and 730^8208C) with the anhydrous assem-blage coesiteþkyanite I, followed by an early near-isothermaldecompression stage (2 9GPa and 705^7808C) with growth ofkyanite II, muscovite, and OH-rich topaz, and by decompression-cooling stages, represented by paragonite (19GPa and 700^7808C)and pyrophyllite (0 3GPaand4008C) on kyanite (I and II) andOH-rich topaz, respectively.These rocks may exhibit unusually lowd
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