Abstract

The Ben Buie intrusion forms the southern edge of the Tertiary Mull igneous complex off the west coast of Scotland. It covers a semicircular-shaped area, and field evidence indicates that it was a roofed intrusion with a low-angle contact with the country rock on the outer margin and a steep contact on the inner margin, the latter probably due to the line of the caldera marginal fault. It is suggested that foundering of the crust of the complex into the magma chamber might have produced a potential vacuum into which the Ben Buie magma was rather passively intruded, with the form governed by the country rock. Such a mode of emplacement, not heretofore described in the Hebridean province, is termed chonolithic.

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