List of Figures

Figure 1: Basic magmatic rocks and their metamorphic equivalents

Figure 2: Lithological variation in a differentiated dolerite sill

Figure 3: Generalised element group distribution with height in a differentiated sill

Figure 4: Generalised element trends with progressive fractionation from basic to acidic

Figure 5: Geochemical data for SW England metadolerites intruded into Devonian and Carboniferous strata

Figure 6: Normalised REE distribution patterns for tholeiites and alkali basalts/dolerites

Figure 7: Geochemical comparison of Welsh metadolerites and Stonehenge bluestones