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Journal of the Geological Society

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Discussion on convection and crystallization in the Criffell–Dalbeattie pluton

The arrangement of disc-shaped xenoliths lying sub-parallel to the deformation foliation (Phillips 1956) is consistent with the alignment of xenoliths by flattening caused by pluton ballooning (Ramsay 1981; Holder 1979). The lack of a measurable schistosity at the margin of the pluton, where xenoliths show little shape modification, together with the increasingly disc-like shape of xenoliths away from the pluton contacts as the deformation foliation intensifies, is cited by Phillips et al. (1981) as evidence precluding ballooning. This situation is similar to that illustrated by strain patterns recorded by deformed xenoliths in the Ardara pluton in Donegal, where intrusion by ballooning is unchallenged (Akaad 1956; Holder 1979, 1981). Strains at the margins of a ballooning pluton need not be high if early stages of ballooning have taken place before consolidation of the magma commenced (Holder 1981), while increases in the intensity of deformation away from the contact of such pluton a are not unknown (Holder 1981).

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This article has been cited by other articles:

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