In this recent contribution, Nutman et al. (2001) provide the first SHRIMP U–Pb zircon age data for the Lizard Peridotite and its immediate envelope, and demonstrate the usefulness of ion-microprobe geochronology in the unravelling of the complex thermo-tectonic history inherent in the emplacement of such assemblages of plausibly oceanic rocks onto continental strata. Building on the research of Cook et al. (2000), the authors distinguish clearly between the Lizard Peridotite proper, a mass of c. 15 kbar mantle tectonite, and the contiguous Crousa Downs complex of gabbro, troctolite and sheeted mafic dykes, emplaced into the peridotite following its...

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