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Earth and Space Sciences · 术语表

什么是 Modal composition; QAPF diagram？

又称： modal composition · QAPF diagram

Definition 9.1 University Earth and Space Sciences — Year 2 · 第 9 章 — Magmatic Series and Tectonic Settings

The modal composition of a rock is the proportion by volume of each of its minerals. The QAPF diagram names a coarse-grained igneous rock with less than $90\,\%$ of mafic minerals from four modal components recalculated to a sum of 100: quartz (Q), alkali feldspar (A), plagioclase (P) and the feldspathoids (F). Since quartz and feldspathoids do not crystallise together, every rock plots in one of two triangles, QAP or FAP, joined along their common side AP.

The QAPF classification of coarse-grained igneous rocks. 1a quartzolite, 1b quartz-rich granitoid, 2 alkali-feldspar granite, 3a syenogranite and 3b monzogranite (together granite), 4 granodiorite, 5 tonalite; 6*–10* the quartz-bearing varieties of 6–10: 6 alkali-feldspar syenite, 7 syenite, 8 monzonite, 9 monzodiorite or monzogabbro, 10 diorite, gabbro or anorthosite; 6’–10’ their foid-bearing varieties; 11 foid syenite, 12 foid monzosyenite, 13 foid monzodiorite or monzogabbro, 14 foid diorite or gabbro, 15 foidolite. Thin fields 6, 6’, 10 and 10’ along the margins are not numbered. After the British Geological Survey scheme (based on Streckeisen 1976).

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