We read with interest the contribution by Blatter et al. (2001) on magmatism in the central part of the Mexican Volcanic Belt. Coexisting subalkaline and alkaline oceanic-island basalt (OIB)-type magmas in both space and time have been reported all along the belt (Blatter et al., 2001; Verma, 2001, and references therein). Many other geological, geophysical, and geochemical features do not follow the conventional subduction scenario (Sheth et al., 2000). We present here some comments on the data presented by Blatter et al. (2001), and a different interpretation of the available geochemical data for the...

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