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Bauer et al. 1973

Bauer, G.R., Fodor, R.V., Husler, J.W. and Keil, K. (1973). Contributions to the Mineral Chemistry of Hawaiian Rocks; III, Composition and Mineralogy of a New Rhyodacite Occurrence on Oahu, Hawaii. Contributions to Mineralogy and Petrology 40(3): 183-194.

Detailed examination of rhyodacite from a new locality on Kauaopuu Ridge, Oahu, Hawaii (the second occurrence of rhyodacite in the Hawaiian volcanic province) yields the following results and conclusions: i) Bulk composition, mineral content, texture, and geographic location indicate that the newly found rhyodacite is part of the Mauna Kuwale rhyodacite flow described by Macdonald (1940); ii) mineral phases include plagioclase (An53-23), biotite, orthopyroxene, Ti-rich hornblende, titaniferous magnetite, and ilmenite; iii) Groundmass glass, about 75% by volume, is similar in bulk composition to oceanic rhyolite such as that of Easter Island and Iceland; iv) Similarity in composition between rhyodacite groundmass glass, described here, and bulk composition of oceanic rhyolite from Easter Island and Iceland, suggests that the latter could conceivably have formed by crystal fractionation of a rhyodacitic magma.

Keywords
andesites; composition; East Pacific Ocean Islands; Hawaii;, Honolulu County Hawaii; igneous rocks; Oahu; Oceania; petrography;, petrology; Polynesia; rhyodacites; rhyolites; United States;, volcanic rocks, 05, Igneous and metamorphic petrology

Journal
Contributions to Mineralogy and Petrology
http://link.springer.de/link/service/journals/00710/

Publisher
Springer-Verlag New York Inc.
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