Robinson, D. and Leake, B. E. 1975. Sedimentary and igneous trends on AFM diagrams. Geological Magazine 112 , pp. 305-307. 10.1017/S0016756800047051 |
Official URL: https://doi.org/10.1017/S0016756800047051
Abstract
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 |
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Date Type: | Publication |
Status: | Published |
Schools: | Earth and Environmental Sciences |
Publisher: | Cambridge University Press |
ISSN: | 0016-7568 |
Last Modified: | 16 Jul 2020 10:45 |
URI: | https://orca.cardiff.ac.uk/id/eprint/133107 |
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