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Plutonic igneous rocks of Middle Jurassic, Cretaceous, and Eocene age from southeast British Columbia exhibit a range of initial Nd and Sr isotopic compositions described by εNd(T) = −2.7 to −13.4, and εSr(T) = −13.8 to 69.5. In contrast, Early Jurassic volcanic rocks from the area have εNd(T) values between +2.9 and +6.5, and εSr(T) between −7.1 to 1.7. Cordilleran sedimentary and metasedimentary rocks of Middle Proterozoic to Triassic in age from this area have εNd(at 164 Ma) values between −3.1 and −13.4. These plutonic igneous rocks formed in continental-arc...

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