We welcome the interesting paper by Ferrari et al. (2001) on the Trans-Mexican volcanic belt—a key province in understanding the geological evolution of the Americas. The presence of coexisting subalkaline (calc-alkaline in Ferrari et al., 2001) and alkaline oceanic-island basalt–type magmas (in space and time) along the province (Verma, 2001) is a challenge for petrologists. Unfortunately, observations related to the Trans-Mexican volcanic belt have been interpreted under a preconceived idea regarding the subduction process occurring along the Middle America trench. We point out some objections to Ferrari et al.'s data and model and provide a different interpretation.

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Ferrari et...

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