Foster and Rubenach agree with our analysis that burial of the high heat–producing Sybella granite in the Western fold belt, Mount Isa, is capable of generating the metamorphic signature associated with the Isan orogeny. However, they dispute the general applicability of our model, arguing that the metamorphic signature in the Eastern fold belt must also reflect transient thermal spikes associated with synmetamorphic intrusions. In this way, their comment is slightly disingenuous, because our paper (McLaren et al., 1999) did not set out to explain the origins of the metamorphic signature across the entire Mount Isa region. Nor do...

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