Differences in oxygen isotope compositions between quartz and alkali feldspar in partially melted pelitic and semipelitic rocks from the aureole of the Ballachulish igneous complex (Scotland) range from relatively normal values of 1‰ down to nonequilibrium reversed values of -0.7‰. Normally, an open- system process (i.e., fluid infiltration after crystallization) would be invoked to explain such reversed values. However, application of a closed-system model to these rocks shows that the observed isotopic differences are actually consistent with such behavior. In this case, no fluid infiltration is required to explain the observed oxygen isotope compositions.

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