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A simple alkalinity ratio and its application to questions of non-orogenic granite genesis

Published online by Cambridge University Press:  01 May 2009

J.B. Wright
J.B. Wright
Affiliation:
Department of Geology, Ahmadu Bello University, Zaria, Republic of Nigeria.
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Summary

Commonly used variation diagrams do not convincingly distinguish strongly alkaline, alkaline and calc-alkaline rocks over the full range of silica contents, especially for more acid varieties. In particular, the Rittmann Suite Index, a, becomes invalid once SiO2 exceeds about 70%.

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Type
Articles
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Geological Magazine , Volume 106 , Issue 4 , 27 August 1969 , pp. 370 - 384
Copyright
Copyright © Cambridge University Press 1969

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