Origin of bimodal rear‐arc volcanism, Trans‐Mexican Volcanic Belt eastern sector: Geochemical and isotopic evidence from the Quaternary Xihuingo‐La Paila Volcanic Field
Abstract:The Quaternary Xihuingo‐La Paila Volcanic Field comprises basalts and basaltic andesites (0.8–0.5 Ma) that built many scoria cones, shield volcanoes, and contemporaneous (~0.4 Ma) dacitic dome structures, emplaced in the rear‐arc area of the Trans‐Mexican Volcanic Belt eastern sector. Most basalts and basaltic andesites exhibit LILE/HFS ratios related to subduction processes. Nevertheless, some basaltic cones are alkaline in composition, with trace‐element patterns that indicate an enriched mantle source, but … Show more
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