We welcome the paper of McLaren et al. (1999) because it makes an important contribution to our understanding of the source of thermal anomalies in low-pressure metamorphic belts. However, we argue that high radiogenic heat–producing granites such as the Sybella batholith, although locally important in the overall thermal budget, were not the primary cause of low-pressure metamorphism in the Mount Isa inlier, and that synmetamorphic intrusions were a significant additional factor.

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A simplified isograd map for the inlier shows amphibolite facies rocks are concentrated in four major belts that show a close spatial relationship with the occurrence of granites (Fig.1)...

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