Sir:The long-anticipated discussion of our contribution (Sillitoe and Burrows, 2002) on the origin of the El Laco magnetite deposit, northern Chile, by Henríquez et al. (2003) reiterates their contention that genesis required a subaerial iron oxide magma rather than simply shallow, subsurface metasomatic replacement. While not wanting to repeat the textural observations and interpretations made in Sillitoe and Burrows (2002), we welcome the opportunity to further highlight the principal evidence for a metasomatic-replacement origin—in particular, that provided by the volcanic material enclosed within the massive magnetite and the widespread zone of related steam-heated alteration.
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