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The central Taupo Volcanic Zone (TVZ) in New Zealand currently is the most frequently active and productive area of silicic (overwhelmingly rhyolitic) volcanism on Earth. From 1.6 Ma to present, 25 caldera-forming eruptions have occurred, largely represented by ignim-brites, of which 23 are of dacitic to rhyolitic composition (c. 65-77% SiO2). These eruptions together represent c. 6000 km3 of magma, but this record is known to be incomplete. Other large (but as yet unquantified) eruptions are recorded in deep-sea cores and now-uplifted Pleistocene marine sediments, but correlations to mapped ignimbrite sheets are incomplete...

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