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The interaction between rocks and water during low-grade metamorphism leads to the growth of a predominantly hydrated secondary mineral assemblage and results in the elevation of whole-rock oxygen isotope values. Rb-Sr whole-rock isotope systems are also disturbed during low-grade metamorphism and give reset metamorphic ages. The process of isotope disturbance during low-grade metamorphism is examined by comparing the behavior of the oxygen isotope systems in rocks of similar composition that have undergone differing levels of metamorphic recrystallization.

Two intrusions from the Ordovician volcanic province of North Wales represent metamorphically undisturbed systems. They give low oxygen isotope whole-rock values of δ...

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