![]() ![]() QAPF diagrams are mostly used to classify plutonic rocks ( phaneritic rocks), but are also used to classify volcanic rocks ( aphanitic) if modal mineralogical compositions have been determined. Geologists worldwide accept the diagrams as a classification of igneous, especially plutonic rocks. QAPF diagrams were created by the International Union of Geological Sciences (IUGS): Subcommission on the Systematics of Igneous Rocks įostered by Albert Streckeisen (whence their alternative name: Streckeisen diagrams). Q, A, P and F percentages are normalized (recalculated so that their sum is 100%). These are the mineral groups used for classification in QAPF diagram. The acronym QAPF stands for " Quartz, Alkali feldspar, Plagioclase, Feldspathoid (Foid)". A QAPF diagram is a double quasi- ternary diagram which is used to classify igneous rocks based on mineralogic composition. ![]()
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