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Sedimentary analcime rocks and sodium-rich gneisses

Published online by Cambridge University Press:  14 March 2018

D. S. Coombs
D. S. Coombs*
Affiliation:
Geology Department, University of Otago
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Summary

As indicated by Tilley (1925), albite-rich schists and gneisses can inherit their abnormal chemical characteristics from sediments that are proving to be by no means rare. They may be rich in detrital sodic plagioclase or they may contain authigenie analcime. Some sedimentary analcime rocks (‘analcimolites’) carry normative nepheline and so offer potential parent rocks for nepheline-bearing gneisses provided that, in these gneisses, SiO2 ⩾ (4Na2O+6K2O) in molecular proportions. The chemistry and occurrence of soda-rich sediments are reviewed. Some New Zealand occurrences are newly described and hitherto unpublished analyses are presented for porphyroblastic albite schist and felsitic volcanic arenite from Otago, and for analcime-rich sediments from four localities.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 144 - 158
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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