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Coarse-grained ("plutonic") crystalline igneous rock

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About Coarse-grained ("plutonic") crystalline igneous rockHide

QAPF_P_.png

Rocks in section 1 of the QAPF diagram.


Coarse-grained crystalline normal igneous rock. Coarse grained usually means >2mm, easily visible to the naked eye. In many classification systems these are termed "plutonic" and are usually intrusive.
1 Quartz-Rich Granitoid
1a Quartzolite
2 Alkali-Feldspar Granite
3 Granite (3a: Syenogranite - 3b: Monzogranite)
4 Granodiorite
5 Tonalite
6 Alkali-Feldspar Syenite
6* Quartz-Bearing Alkali-Feldspar Syenite
6' Foid-Bearing Alkali-Feldspar Syenite
7 Syenite
7* Quartz-Bearing Syenite
7' Foid-Bearing Syenite
8 Monzonite
8* Quartz-Monzonite
8' Foid-Monzonite
9 Monzodiorite / Monzogabbro
9* Quartz-Monzodiorite / Quartz-Monzogabbro
9' Foid-Monzodiorite / Foid-Monzogabbro
10 Diorite / Gabbro / Anorthosite
10* Quartz-Diorite / Quartz-Gabbro
10' Foid-Bearing Diorite / Foid-Bearing Gabbro
11 Foid-Syenite (Foyaite)
12 Foid-Monzosyenite
13 Foid-Monzodiorite (Essexite)
14 Foid-Diorite
15 Foidolite

Field 3 is sometimes subdivided into fields 3a and 3b, which correspond to syenogranite and monzogranite. Usually both are treated as one field.


Classification of Coarse-grained ("plutonic") crystalline igneous rockHide

The QAPF diagram
breaks coarse-grained crystalline igneous rocks down into 15 groups according to the IUGS recommendations for igneous rock classification.


Sub-divisions of Coarse-grained ("plutonic") crystalline igneous rockHide

Synonyms of Coarse-grained ("plutonic") crystalline igneous rockHide

References for Coarse-grained ("plutonic") crystalline igneous rockHide

Reference List:
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Freiberg, R., Hecht, L., Cuney, M., and Morteani, G. (2001) Secondary Ca-Al silicates in plutonic rocks: implications for their cooling history. Contributions to Mineralogy & Petrology: 141: 415-429.

Internet Links for Coarse-grained ("plutonic") crystalline igneous rockHide

 
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