Title: Sedimentary and igneous trends on AFM diagrams
Abstract: Summary It is pointed out that some chemically analysed sedimentary rock series when plotted on AFM diagrams (A = Na 2 O + K 2 O; 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.
Publication Year: 1975
Publication Date: 1975-05-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 7
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