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Classification of Igneous Rocks. Figure 2-1a . Method #1 for plotting a point with the components: 70% X, 20% Y, and 10% Z on triangular diagrams. An Introduction to Igneous and Metamorphic Petrology, John Winter, Prentice Hall. Classification of Igneous Rocks.

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Classification of igneous rocks
Classification of Igneous Rocks

Figure 2-1a. Method #1 for plotting a point with the components: 70% X, 20% Y, and 10% Z on triangular diagrams. An Introduction to Igneous and Metamorphic Petrology, John Winter, Prentice Hall.


Classification of igneous rocks1
Classification of Igneous Rocks

Figure 2-1b. Method #2 for plotting a point with the components: 70% X, 20% Y, and 10% Z on triangular diagrams. An Introduction to Igneous and Metamorphic Petrology, John Winter, Prentice Hall.


Classification of igneous rocks2

(a)

Q

The rock must contain a total of

at least 10% of the minerals below.

Quartzolite

Renormalize to 100%

90

90

Classification of Igneous Rocks

Quartz-rich

Granitoid

60

60

Grano-

Tonalite

Granite

Alkali Feldspar Granite

diorite

Alkali Fs.

Qtz. Diorite/

20

20

Quartz Syenite

Qtz. Gabbro

Quartz

Quartz

Quartz

Monzonite

Syenite

Monzodiorite

Alkali Fs.

5

Diorite/Gabbro/

5

Syenite

Syenite

Monzodiorite

Monzonite

Anorthosite

90

35

10

65

A

P

(Foid)-bearing

(Foid)-bearing

(Foid)-bearing

Syenite

Monzonite

Monzodiorite

(Foid)-bearing

10

10

Diorite/Gabbro

(Foid)-bearing

Alkali Fs.

Syenite

(Foid) Syenite

(Foid)

(Foid)

Monzosyenite

Monzodiorite

(Foid) Gabbro

Figure 2-2. A classification of the phaneritic igneous rocks. a. Phaneritic rocks with more than 10% (quartz + feldspar + feldspathoids). After IUGS.

60

60

(Foid)olites

F


Classification of igneous rocks3

Olivine

Dunite

90

Peridotites

Wehrlite

Lherzolite

Harzburgite

40

Pyroxenites

Olivine Websterite

Orthopyroxenite

10

Websterite

10

Clinopyroxenite

Orthopyroxene

Clinopyroxene

Classification of Igneous Rocks

Figure 2-2. A classification of the phaneritic igneous rocks. b. Gabbroic rocks. c. Ultramafic rocks. After IUGS.

(c)


Classification of igneous rocks4
Classification of Igneous Rocks

Figure 2-3. A classification and nomenclature of volcanic rocks. After IUGS.


Classification of igneous rocks5
Classification of Igneous Rocks

Figure 2-4. A chemical classification of volcanics based on total alkalis vs. silica. After Le Bas et al. (1986) J. Petrol., 27, 745-750. Oxford University Press.


Classification of igneous rocks6
Classification of Igneous Rocks

Figure 2-5. Classification of the pyroclastic rocks. a.Based on type of material. After Pettijohn (1975) Sedimentary Rocks, Harper & Row, and Schmid (1981) Geology, 9, 40-43. b.Based on the size of the material. After Fisher (1966) Earth Sci. Rev., 1, 287-298.


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