Abstract.
The strong negative correlation between the temperatures and melt H2O contents of granitoid magmas implies that the crustal melting reactions that produced the magmas were strongly buffered, with T and aH2O co-varying within a narrow band. This observation can only be explained if the partial melting reactions that created the magmas were either fluid-absent from the outset or evolved toward this condition as melting progressed. Since these melting reactions occur during upper amphibolite- to granulite-facies metamorphism, it is reasonable to conclude that metamorphic events responsible for the generation of granitoid magmas generally occur in the absence of excess pervasive fluid.
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Clemens, .J., Watkins, .J. The fluid regime of high-temperature metamorphism during granitoid magma genesis. Contrib Mineral Petrol 140, 600–606 (2001). https://doi.org/10.1007/s004100000205
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DOI: https://doi.org/10.1007/s004100000205