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Journal of the Geological Society

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Pluton shapes in the Cornubian Batholith: new perspectives from gravity modelling

School of Earth, Ocean and Environmental Sciences, University of Plymouth, Plymouth PL4 8AA, UK (e-mail: GTaylor@plymouth.ac.uk)

Gravity modelling of the Dartmoor, Bodmin, St. Austell and Carnmenellis plutons of the Cornubian Batholith of SW England strongly supports a tabular form for the exposed granites. Modelled thicknesses for the individual bodies, with the exception of Dartmoor, are consistent with those derived from empirical relationships for plutons and laccoliths. In the case of the Dartmoor, Bodmin and St. Austell plutons the deepest parts are located near their southern margins, suggesting a steep conduit with northerly and outward direct flows. Modelling of the Carnmenellis granite suggests a more centrally located feeder. In the case of Dartmoor, at least, the granite appears to have exploited the Devonian–Carboniferous interface during its emplacement.