Notes on the geology of the Tongan Islands
- 1 December 1967
- journal article
- research article
- Published by Taylor & Francis in New Zealand Journal of Geology and Geophysics
- Vol. 10 (6), 1424-1428
- https://doi.org/10.1080/00288306.1967.10423226
Abstract
The Tongan Islands lie along the north-east trending Tunga Ridge that separates the Tonga Trench in the east from the Lau Basin to the west. They consist of active andesitic volcanoes along the north-west margin, whereas in the east they consist of older tuffaceous sediments together with rhyolites of Eocene age, and also limestones of Eocene to Quaternary age. Tilted terraces extend up to 750 ft above sea level. Geophysical evidence and metamorphic minerals within the pyroclastics suggests that the Tonga Ridge consists of a continental type crust.Keywords
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