Lab 1: Felsic Intrusive (phaneritic)

GY303 Felsic to Intermediate Lab Key 2014
Lab 1: Felsic Intrusive (phaneritic)
Sample
Min. %
Min. %
Min. %
Min. %
Min. %
Total
Ternary
%
1. RI1029
K-Feld.
50
Na-Plag.
15
Qtz. 15
Biotite
15
Acc. 5
100
A=62;
Q=19; P =
19
2. DA1220
K-Feld.
25
Na-Plag.
55
Qtz. 10
Hbl. 5
Acc. 5
100
A=28;
Q=11; P=61
3. DA1224
K-Feld.
75
Qtz. 5
Biotite
10
Musc. 10
100
A=94; Q=6;
P=0
4. W-23
K-Feld.
55
Na-Plag.
10
Neph. 15
Hbl. 20
100
A=69;
F=19; P=12
5. TK-1A
K-Feld.
27
Na-Plag.
27
Qtz. 27
Biotite 5
100
A=33; Q=
33; P = 33
Actinolite
4; Acc. 4
Lab 1 Key: Q-A-P Ternary
1.RI1029 (A=62;Q=19;P=19)
2.DA1220 (A=28;Q=11;P=61)
3. DA1224 (A=94;Q=6;P=0)
5. TK-1A (A=33; Q=33; P=33)
Rock classification
• 1. RI1029: gray-white fine-grained biotite quartz
•
•
•
•
syenite
2. DA1220: pink-white porphyritic med-grained
quartz monzodiorite
3. DA1224: red medium-grained Ms. Bi. Qtz.
alkali feldspar syenite
4. W-23: green-gray coarse-grained Hbl. foid
monzosyenite
5. TK-1A: Pink-gray coarse-grained granite
Lab-1 Key: F-A-P Ternary
F (foids)
IUGS Classification for felsic igneous rocks
SiO2 undersaturated
10
20
90
Foidolite
(Foidite)
80
30
70
4. W-23 (A=69; F=19; P=12)
60
40
50
50
40
60
Foid
syenite
(Phonolite)
Foid
gabbro
(tephrite,basanite)
Foid
monzodiorite
(Phonolitic tephrite)
Foid monzosyenite
(Tepheritic phonolite)
70
30
20
80
10
90
Alkali feldspar
syenite (Trachyte)
Monzonite
(Latite)
Syenite
(Trachyte)
10
A(alkali feldspar)
20
30
40
50
Diorite(andesite),
Gabbro (basalt)
Diorite
(andesite)
60
70
80
90
P(plagioclase)
Problem 6 & 7
6. Lt. gray med.-grained
porphyritic Bi. Granodiorite
(A=15; Q=30; P=55)
7. Pink coarse-grained Bi. Ms.
quartz Monzonite
(A=45; Q=10; P=45)
Problem 8
F (foids)
8. grayish-green fine-grained
epidotized Cpx. Hbl. Foid
Monzodiorite Porphyry
(A=15; F=30; P=55)
IUGS Classification for felsic igneous rocks
SiO2 undersaturated
10
20
90
Foidolite
(Foidite)
80
30
70
60
40
50
50
40
60
Foid
syenite
(Phonolite)
Foid
gabbro
(tephrite,basanite)
Foid
monzodiorite
(Phonolitic tephrite)
Foid monzosyenite
(Tepheritic phonolite)
70
30
20
80
10
90
Alkali feldspar
syenite (Trachyte)
Monzonite
(Latite)
Syenite
(Trachyte)
10
A(alkali feldspar)
20
30
40
50
Diorite(andesite),
Gabbro (basalt)
Diorite
(andesite)
60
70
80
90
P(plagioclase)