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Sedimentary and igneous trends on AFM diagrams.

Robinson, D. and Leake, B. E. 1975. Sedimentary and igneous trends on AFM diagrams. Geological Magazine 112 , pp. 305-307. 10.1017/S0016756800047051

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It is pointed out that some chemically analysed sedimentary rock series when plotted on AFM diagrams (A = Na2O + K2O; F = total iron as FeO; M = MgO) partly mimic trends generally considered characteristic of igneous variation, especially the calc-alkali trend. Although the scatter in sedimentary rock plots is generally greater than that given by igneous rocks this is not necessarily so for calc-alkali suites often show considerable scatter. These observations should be considered when deducing the origin of highly metamorphosed gneisses and quartzo-feldspathic rocks that might be meta-arkoses, meta-granites or meta-volcanic rocks.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Publisher: Cambridge University Press
ISSN: 0016-7568
Last Modified: 16 Jul 2020 10:45

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