Abstract
A chemical analogue of the QAPF projection is essential if volcanic rocks are to be fitted into the classification scheme for plutonic rocks proposed by the I.U.G.S. Subcommission on Systematics of Igneous Rocks. Frequency distributions of Cenozoic basalts, basanites, dacites and andesites in such an analogue, based on the C.I.P.W. norm, suggest desirable changes in the bounds of classes 9, 10, 13 and 14 and in the names of classes 4, 5 and 13.
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