Stable isotope constraints on the origin of the Cabo de Creus garnet-tourmaline pegmatites,Massif des Alberes,Eastern Pyrenees,Spain |
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Authors: | Klaus-Werner Damm Russell S. Harmon Peter-Michael Heppner Ulrich Dornsiepen |
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Abstract: | Pegmatite dyke swarms are exposed within the easternmost Pyrenees at Cabo 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 ≈ 600°C, the lack of obvious subsolidus exchange, and the H- and O-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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Keywords: | Anatexis Pegmatite Pyrenees Stable Isotopes |
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