The rocks of the area are complex and have featured in international geological debate since the 1950s. The composition of the remainder of the volcano today is dominated by gabbro and granophyre and is also the site of a noted occurrence of platinum group elements. The ring dyke is composite with both porphyritic granophyre and porphyritic felsite components. The structure of the ring dyke was produced when the active volcano's caldera underwent collapse producing a concentric suite of faults providing space into which magma was able to intrude.
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