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Six new 40 Ar/ 39 Ar and three cosmogenic 36 Cl age determinations provide new insight into the late Quaternary eruptive history of Erebus volcano. Anorthoclase from 3 lava flows on the caldera rim have 40 Ar/ 39 Ar ages of 23±12, 81±3 and 172±10 ka (all uncertainties 2σ). The ages confirm the presence of a second, younger, superimposed caldera near the southwestern...
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