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The large Pliocene Caviahue caldera and associated active Copahue volcano are major volcanic features on the northwestern side of the Neuquén Basin. Chemical and petrographic data from the volcanic complex show a compositional range from basaltic andesite to rhyolite, predominance of two-pyroxene andesites and dacites, and a major quartz-biotite–bearing rhyolitic ignimbrite, which is part of the Riscos Bayos ignim-brite complex. Caldera wall sequences are dominated by lava and debris flows that show no consistent temporal trend toward more evolved magmas. The lavas at the top of the caldera wall series are among the most mafic in the region. The Copahue...

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