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This study presents new field, structural, petrographic, and geochemical data on the Cenozoic volcanic rocks of the northwestern Sierra Madre Occidental (SMO). Since the Mesozoic, this region has been the site of three successive magmatic events: (1) A calcalkaline sequence (90 to 40 Ma), which in Sonora is characterized by the emplacement of the granitoids of the Cordilleran coastal batholiths coeval with the subduction of the East Pacific plate under the North American continent. (2) An Eocene-Oligocene (around 35 Ma) volcanic sequence represented by calcalkaline andesites and high-K ignimbrites. The plagioclase-biotite phenocrystic assemblage is typical of the ignimbrites of this...

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