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An acid vein from a borehole in the Kennack Gneiss has given a whole-rock Rb-Sr isochron age of 369 ± 12 Ma. This is interpreted as a metamorphic age recording the time of emplacement of the Lizard Complex. This emplacement in late Devonian times was part of an early phase of the Hercynian Orogeny which also affected the Gramscatho 'Series' of S Cornwall.
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