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A new method of palaeofield magnitude correction for thermally altered samples and its application to Lower Carboniferous lavas
Authors:T C Rolph  J Shaw
Institution:Department of Geology, University College, PO Box 78, Park Place, Cardiff CF1 1XL
Abstract:Summary. Some lavas of Early Carboniferous age from Scotland and Derbyshire have been analysed for palaeofield magnitude by the application of a new correction to data obtained by the Shaw method. Its application has yielded field magnitude values from data which had previously been rejected. A modern pottery specimen and recent lavas from Sicily and Westman Island have also been analysed.
An average virtual dipole moment (VDM, Smith) of 2.5 ± 0.4 × 1022 A m2 was determined for the Early Carboniferous. This is only 30 per cent of the present-day VDM.
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