Abstract
The Managalase Plateau in north-east Papua is a faultbounded block of fractured basement metabasalt and basic plutonic rock overlain in the east by some thirty small volcanic centres of late Pleistocene to Recent age which include rhyodacite ash cones and trachybasalt and basaltic latite lava. To the north andesitic strato-volcanoes of Pleistocene and Recent age occur along the margin of the Cape Vogel geosyncline, whereas to the south a series of basaltic latite, alkali basalt and ultra-alkaline lava of Pliocene age margin the Papuan basic-ultrabasic belt.
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