Caledonian granite radiometric dating tests

The Ross of Mull granite complex was emplaced near the western margin of the Orthotectonic Caledonides of Scotland in early–mid-Silurian times.

Anisotropy of magnetic susceptibility reflects the post-tectonic character of the pluton and contrasts with magnetic fabrics in adjoining country rocks which record the regional D3 deformation.

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Sadhbh Baxter Department of Earth and Ocean Sciences, National University of Ireland, Galway, Ireland.

Brent Miller Department of Geological Sciences, University of North Carolina, Chapel Hill, NC 27599-3315 USA.

Early coeval diorite and granite magmas are concomitant with the development of pure flattening fabrics and are succeeded by emplacement of a suite of generally unfoliated granites intruded in a brittle fracture regime.

The results of the U-Pb zircon geochronology (G1 = 394.4 ± 2.2 Ma; G2~402 Ma; G3 = 397.7 ± 1.1 Ma; G4 = 399.5 ± 0.8 Ma) indicate that the emplacement of the early suite occurred over at least 8 Ma and belongs to the Late Emsian stage.

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