Castillo (2008) proposes a “new model” of postsubduction magmatism that is largely based on the reinterpretation of geochemical data previously published by our team. We agree that the hypothesis of the opening of an asthenospheric window following a ridge-subduction process beneath the Baja Peninsula proposed in our earliest papers (Aguillón-Robles et al., 2001; Benoit et al., 2002) is inconsistent with the presence of abandoned segments of the Pacific-Magdalena ridge off the fossil trench (Fig. 1; Wilson et al., 2005; Michaud et al., 2006). However, the alternative hypothesis of slab tearing within the young...

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