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Low-potash dacite drift pumice from the Coral Sea

Published online by Cambridge University Press:  01 May 2009

W. B. Bryan
W. B. Bryan
Affiliation:
Geophysical Laboratory, Carnegie Institution, 2801 Upton Street, N.W., Washington D.C. 20008.
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Summary

Drift pumice collected in December, 1964, from the Herald Cays in the western Coral Sea is chemically and petrographically a dacite, unusually low in K2O and with very calcic plagioclase. It is apparently identical to pumice washed ashore in Fiji in March, 1965; both collections are divisible into light and dark varieties on megascopic, optical and chemical criteria. This pumice is distinguishable from the widely distributed pumice of the 1962 South Sandwich eruption; it is considered to have originated along the Tonga-Kermadec ridge on the basis of available seismic and compositional data.

Type
Articles
Information
Geological Magazine , Volume 105 , Issue 5 , October 1968 , pp. 431 - 439
Copyright
Copyright © Cambridge University Press 1968

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References

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