CiteWeb id: 19760000070

CiteWeb score: 2426

DOI: 10.1016/0012-8252(76)90052-0

The paper comments on the recommendations on which the IUGS Subcommission on the Systematics of Igneous Rocks agreed at Montreal, August 1972.Plutonic rocks are classified and named according to mineral contents. For nomenclature are considered: Q = quartz, A = alkali feldspar (incl. albite), P = plagioclase, F = feldspathoids, M = mafic and related minerals. Rocks with M less than 90 are named according to their positions in the QAPF diagram, the light-colored constituents being calculated to the sum 100. The following are treated: granitoids and related rocks, ultramafic and gabbroic rocks, charnockitic rocks, feldspathoidal rocks. A color index is used to distinguish the leuco- and mela-types of each rock group in comparison with normal types.

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