P. S. Kennan, F. C. Murphy; Tectonically reset Rb-Sr system during Late Ordovician terrane assembly in lapetus, western Ireland. Geology ; 15 (12): 1155–1158. doi: https://doi.org/10.1130/0091-7613(1987)15<1155:TRRSDL>2.0.CO;2
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The uncertainty of a ca. 460 Ma age of mylonitization of acid igneous rocks in the western Irish Caledonides required reevaluation of the published Rb-Sr whole-rock data. We found that the data support an alternative ca. 426 ±10 Ma age of mylonitic resetting. This time of deformation relates to the assembly of suspect terranes during Late Ordovician closure of the lapetus ocean.