Pegmatite dyke swarms are exposed within the easternmost Pyrenees at Cab0 de Creus. These dykes were emplaced into high-grade metamorphosed sedimentary strata of Cambro-Ordovician age, but lack obvious field relationship to Hercynian intrusive rocks. Together with structural and geochemical data, equilibrium oxygen isotope fractionations at temperatures of =6OO0C, the lack o f obvious subsolidus exchange, and the H-and 0-isotopic signatures of water in equilibrium with pegmatite mica and quartz are interpreted to indicate a derivation from anatexis of a metapelitic source at shallow crustal levels.
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