Abstract

Abstract Mayor Island consists of Recent pantelleritic lavas and pumice deposits quite different from the calc-alkaline volcanic rocks of the Coromandel Peninsula, 16 miles to the west, and the Taupo Volcanic Region to the south (Ewart et al., 1968). For this reason a granodioritic xenolith (P37288) recently found on the island by Mr D. E. H. Rishworth, New Zealand Geological Survey, Rotorua, is of interest and provides information on subsurface conditions in the region and may be compared with similar xenoliths from the Taupo Volcanic Zone (Ewart and Cole, 1967).

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