Mineralogy and Geochemistry of the Younger Volcanic Islands of Tonga, S.W. Pacific
- 1 October 1973
- journal article
- Published by Oxford University Press (OUP) in Journal of Petrology
- Vol. 14 (3) , 429-465
- https://doi.org/10.1093/petrology/14.3.429
Abstract
The Tongan Islands comprise a double island chain, and lie at the northern end of an active island arc extending NNE from northern New Zealand. The eastern chain are limestone covered, with an underlying pre-Upper Eocene gabbro-basalt-andesite series exposed on one island. The active volcanoes, the subject of this paper, form the western island chain, and lie some 100 km above a westward dipping seismic zone. Basaltic andesite dominates the islands of Hunga Ha'apai and Late (and also Tofua and Kao, which are not described in this paper). Dacite is the main lava of Fonualei and the 1967–68 Metis Shoal eruption. Acid andesites occur only sporadically.Keywords
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