Abstract
Explanations of the formation of radial dykes, ring dykes and cone sheets are reviewed and the explanations of the formation of cone sheets are found to be unsatisfactory. Ring dykes develop on shear fractures formed in the overlying rocks when the magma subsides as explained by E.M. Anderson. Radial dykes and cone sheets form as a result of the upward pressure of the magma, and the problem is to explain the development of the two very different stress distributions which gave rise to the two kinds of intrusion. The radial dykes are simple hydraulic tension fractures formed periodically during the upwelling of the magma. It is suggested that the cone sheets occupy shear fractures formed as the result of dynamic stresses arising from the rapid expansion of a magma undergoing retrograde boiling.
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