Abstract
[Streck et al. (2007)][1] state that primitive andesite lavas (Mg# > 0.6; 53–63 wt% SiO2) from Mt. Shasta are not primary melts, but instead are mixtures of evolved, high-Sr/Y, low-Mg# dacite with primary, low-Sr/Y, high-Mg# basalt. They propose that this mixing forms primitive andesites worldwide
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