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A Mössbauer spectroscopic study of the cooling history of hypersthene from selected members of the Taupo Pumice formation, New Zealand

Published online by Cambridge University Press:  05 July 2018

J. H. Johnston  and
K. E. Knedler
J. H. Johnston
Affiliation:
Chemistry Department, Victoria University of Wellington, Private BagWellingtonNew Zealand
K. E. Knedler
Affiliation:
Chemistry Department, Victoria University of Wellington, Private BagWellingtonNew Zealand
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Summary

57Fe Mössbauer spectroscopy has been used to determine the Mg2+-Fe2+ distribution between the two crystallographically inequivalent cation sites in hypersthenes from a stratigraphic tephra sequence of the Taupo Pumice formation, North Island, New Zealand. From these distributions and X-ray fluorescence analytical data, cooling histories were constructed using previously determined Mg2+-Fe2+ equilibrium isotherms for orthopyroxenes. The results showed that this cooling history geothermometer could be used to enable airfall and airflow tephra to be distinguished. In addition, they showed that the cooling rate of the above deposits correlated better with the deposit thickness, than with the distance of the deposit from the source.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 326 , June 1979 , pp. 279 - 285
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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