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Ultrabasic Breccias in Layered Intrusions: The Rhum Complex: A Reply

which Donaldson suggests may also be a possible product of "eucritic" magma, there is a profusion of dikes ranging from troctolite and allivalite through gabbro to granite (Mossman 1973). In this case, indirect methods of comparison and inference led me to consider the possibility of a basaltic parent magma. This approach is encouraged by the fact that, at Greenhills, hydrous magmatic phases-chiefly pargasitic hornblende and biotite-abound in certain early dikes and in the layered series. This observation fits well with the behavior of a basaltic magma under high PH2O conditions where liquidus-solidus relationships are depressed, allowing the generation of a more calcic plagioclase for the same bulk composition (Yoder and Tilley 1962; Green and Ringwood 1968). Finally, Donaldson's reference (1975, p. 41) to Wager mentioning the possibility of a eucritic parent magma for the ultrabasic rocks of Rhum is unwarranted. When taken in context, Wager's (1968, p. 608) observation on the monomineralic layers of plagioclase, Ansg, in the ultramafic bottom accumulation of Rhum, "in a well-compacted accumulation of tabular feldspars there must have been 30-40% of intercumulus liquid which . . . would have been eucritic in composition" is not a statement on the nature of the Rhum parent magma. Elsewhere (Wager 1968) refers to intercumulus magma and the main body of magma as gabbroic. Further, in Wager and Brown (1968, p. 291) the conclusion that a high-alumina basalt of tholeiitic affinities is the Rhum parent magma is clearly enunciated. In light of Le Bas's (1962) review and the present discussion, the term, "gabbroic," suitably qualified, is much preferred to "eucrite."