Abstract
Contaminated igneous rocks [1, pp. 177–83; 2, pp. 446–86; 3, pp. 128–46] are those resulting from the solidification of a magma which has been modified by reaction with xenoliths, usually of sedimentary origin. The Younger Gabbro masses of North-East Scotland provide what are probably the best examples of this phenomenon yet known, and their investigation will doubtless throw some light upon current petrogenetic theory.

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