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On the Graphical Representation of Differentiation Trends in Igneous Rocks

Published online by Cambridge University Press:  01 May 2009

E. S. W. Simpson
E. S. W. Simpson
Affiliation:
Department of Geology, University of Cape Town, South Africa.
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Abstract

This paper describes a revised method of plotting analyses of igneous rock suites using the Mafic and Felsic Indices as defined. A composite M–F diagram has certain advantages over the triangular iron-magnesia-alkalis diagram and enables a genetic distinction to be made between the tholeiitic and calc-alkaline series.

Type
Articles
Information
Geological Magazine , Volume 91 , Issue 3 , June 1954 , pp. 238 - 244
Copyright
Copyright © Cambridge University Press 1954

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References

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