According to Blattner's Comment, the difference in measured δD values is evident (∼40‰) but not statistically significant (biotite δD values in nature scatter as much as 30‰), and such values cannot be used to distinguish meteoric waters with different isotopic compositions.

Based on a limited number of analyses, we reported a range of δD values similar to the one described in Criss and Taylor (1983) for biotites from the Mesozoic tonalite-granodiorite-monzogranite rocks of the Idaho batholith. Possible causes addressed for δD variability in this area were: (1) a broad range of temperatures at which the interaction between the meteoric-hydrothermal water...

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