Chemical and mineralogical evidence indicates that the hornblende-bytownite greenstones and the anthophyllite-cummingtonite and cordierite-biotite hornfels rocks of the Kenidjack area, Cornwall, England, were developed from a sedimentary series comprising limestones and calcareous shales with intercalated igneous rocks of spilitic type by regional iron metasomatism with accompanying migration of magnesium. The rocks were situated in the marginal zone of granitization in the foredeep in front of the rising Hercynian (late Paleozoic) ranges.

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