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Pyroxene relations in two Hawaiian hypersthene-bearing basalts

Published online by Cambridge University Press:  14 March 2018

I. D. Muir  and
J. V. P. Long
I. D. Muir
Affiliation:
Department of Mineralogy and Petrology, Cambridge
J. V. P. Long
Affiliation:
Department of Mineralogy and Petrology, Cambridge
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Summary

A preliminary account is given of an optical and electron-microprobe investigation into the pyroxene relations of Hawaiian hypersthene-bearing lavas. It is shown that the clinopyroxene jackets to the phenocryst hypersthenes consist of strongly zoned augite, not pigeonite as formerly believed; the compositional range of this pyroxene is approximately the same as that of the groundmass augite phase. Groundmass pyroxene relations are complex; in one case two distinct pyroxene phases, augite and pigeonite occur, in the other all compositions lying between augite and pigeonite are encountered.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 358 - 369
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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References

Binns, (R.A.), Long (J. V. P.), and Reed (S. J. B.), 1963. Nature, vol. 198, p. 777.Google Scholar
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Muir, (I.D.) and Tilleu, (C.E.), 1957. Amer. Journ. Sci., vol. 255, p. 241.Google Scholar
Muir, (I.D.) 1963. Ibid., vol. 261, p. 111.Google Scholar
Reed, (S. J. B.), 1964. Ph.D. dissertation, University of Cambridge.Google Scholar