Volcanoes in the Bay of Plenty. Modified from Cole (1990).
Mayor Island is a shield volcano with a caldera in the west part of the Bay of Plenty. Two eruptions have been dated by the C-14 method: 6050 BC on the southeast caldera rim and 4390 BC on the south end of the caldera at Taratimi Bay. The eruption in 4390 BC was very large (VEI =5) and complex, with eruptions at the central vent and radial fissures on the flank, submarine eruptions, phreatic eruptions, and pyroclastic flows.
Sources of Information:
Buck, M.D., An assessment of volcanic risk on and from Mayor Island, New Zealand: New Zealand Jour. Geol. Geophys., v. 28, p. 282-298.
Buck, M.D., Briggs, R.M., and Nelson, C.S., 1981, Pyroclastic deposits and volcanic history of Mayor Island: New Zealand Jour. Geol. Geophys., v. 24, p. 449-468.
Ewart, A., Taylor, S.R., and Zcapp, A.C., 1968, Geochemistry of the pantellerites of Mayor Island, New Zealand: Contr. Mineral. Petrology, v. 17, p. 116-140.
Houghton, B.F., Wilson, C.J.N., 1986, Explosive rhyolite volcanism: the case studies of Mayor Island and Taupo volcanoes (Tour Guide Andesite): New Zealand Geol. Surv. Rec., 12, p. 33-100.
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