The geology of Raoul Island,Kermadec group,Southwest Pacific |
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Authors: | R N Brothers E J Searle |
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Institution: | 1. Department of Geology, University of Auckland, New Zealand
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Abstract: | Cauldron collapse and voluminous pumice eruptions, some 2000 years ago, indicate a mature stage in the summit cone of a volcano rising 8000 feet above the ocean floor. Volcanic rocks ranging from early submarine tholeiitic basalts to young subaerial dacite obsidians have been mapped in chronologic sequence through five formations; plutonic rocks, found as accidental blocks and as disrupted cumulates, are gabbros or diorites. Twenty-three new analyses are listed. |
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