2-clasificacion igneas
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Transcript of 2-clasificacion igneas
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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.
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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.
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Classification ofIgneous Rocks
Figure 2-2. A classification of the phaneritic igneous
rocks. a.Phaneritic rocks with more than 10% (quartz +
feldspar + feldspathoids). After IUGS.
The rock must contain a total ofat least 10% of the minerals below.Renormalize to 100%
(a)
Quartz-richGranitoid
9090
6060
2020Alkali Fs.Quartz Syenite
QuartzSyenite
QuartzMonzonite
Quartz
Monzodiorite
Syenite Monzonite Monzodiorite
(Foid)-bearingSyenite
5
10 35 65
(Foid)-bearingMonzonite
(Foid)-bearingMonzodiorite
90
Alkali Fs.
Syenite
(Foid)-bearingAlkali Fs. Syenite
10
(Foid)Monzosyenite
(Foid)
Monzodiorite
Qtz. Diorite/Qtz. Gabbro
5
10
Diorite/Gabbro/Anorthosite
(Foid)-bearing
Diorite/Gabbro
60
(Foid)olites
Quartzolite
Granite Grano-diorite
Q
A P
F
60
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Classification of Igneous Rocks
Figure 2-2.A classification of the phaneritic
igneous rocks. b.Gabbroic rocks. c.Ultramaficrocks. After IUGS.
Plagioclase
OlivinePyroxene
Gabbro
Tro
ctoliteOlivine
gabbro
Plagioclase-bearing ultramafic rocks
90
(b)
Anorthosite
Olivine
ClinopyroxeneOrthopyroxene
Lherzolite
Websterite
Orthopyroxenite
Clinopyroxenite
Olivine Websterite
Peridotites
Pyroxenites
90
40
10
10
Dunite
(c)
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Classification of
Igneous Rocks
Figure 2-3. A classification and nomenclature
of volcanic rocks. After IUGS.
(foid)-bearing Trachyte
(foid)-bearing Latite
(foid)-bearingAndesite/Basalt
(Foid)ites
10
60 60
35 65
10
20 20
60 60
F
A P
Q
Rhyolite Dacite
Trachyte Latite Andesite/Basalt
Phonolite Tephrite
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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.
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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.
