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suggesting that slab melts can be responsible for the metasomatism Extensive sampling of the Antisana volcano in Ecuador (Northern of the mantle wedge beneath the NVZ in Ecuador. If mantle Volcanic Zone of the Andes) has revealed the presence of adakite-like convection can drag down this modified mantle beneath Antisana rocks throughout the edifice, i.e. rocks with geochemical characteristics volcano, destabilization of metasomatic amphibole at appropriate close, but not identical, to those of slab melts. Two main volcanic pressures in this modified garnetiferous mantle can adequately explain groups have been distinguished, characterized by two distinct evoluthe formation and the geochemical features of Antisana lavas. tionary trends. The AND group, mostly composed of andesites, shows the clearest adakitic characteristics such as high La/Yb and Sr/Y ratios and low heavy rare earth element (HREE) contents. The CAK group, composed of high-K andesites and dacites, displays

Adakite-like Lavas from Antisana Volcano (Ecuador): Evidence for Slab Melt Metasomatism Beneath Andean Northern Volcanic Zone