QAPF classification of Plutonic rock | Igneous Petrology in hindi

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In this video we expalin about QAPF diagram of plutonic rocks.
Narrator - Rushabh Lanjewar (AIR 1 - University of Pune 2019)
PLUTONIC ROCKS
This classification should be used only if the rock is considered to be plutonic, i.e. it is assumed to have formed by slow cooling and has a relatively coarse-grained ( greater than 3 mm) texture in which the individual crystals can easily be seen with the naked eye.
There is, of course, a gradation between plutonic rocks and volcanic rocks and the Subcommission suggests that, if there is any uncertainty as to which classification to use, the plutonic root name should be given and prefixed with the term “micro”. For example, microsyenite could be used for a rock that was considered to have formed at considerable depth even if many of the individual crystals could not be seen with the naked eye.
PLUTONIC QAPF CLASSIFICATION
(M less than 90%) The modal classification of plutonic rocks is based on the QAPF diagram and was the first to be completed and recommended by the IUGS Subcommission (Streckeisen, 1973, 1976). The diagram is based on the fundamental work of many earlier petrologists, which is fully summarized by Streckeisen (1967).
The corners of the double triangle are
Q = quartz,
A = alkali feldspar,
P = plagioclase and
F = feldspathoid.
This diagram must not be used for rocks in which the mafic mineral content, M, is greater than 90%.
Alkali feldspar granite - rocks in this field have been called alkali granite by many authors. The Subcommission, however, recommends that the term peralkaline granite be used instead for those rocks that contain sodic amphiboles and/or sodic pyroxenes. The term alaskite may be used for a light-coloured (M less than 10%) alkali feldspar granite.
Gabbro (sensu stricto) = plagioclase and clinopyroxene
Norite = plagioclase and orthopyroxene
Troctolite = plagioclase and olivine
Gabbronorite = plagioclase with almost equal amounts of clinopyroxene and orthopyroxene
Orthopyroxene gabbro = plagioclase and clinopyroxene with minor amounts of orthopyroxene
Clinopyroxene norite = plagioclase and orthopyroxene with minor amounts of clinopyroxene
Hornblende gabbro = plagioclase and hornblende with pyroxene less than 5%.
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Winter.

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