Geology Reference
In-Depth Information
Table 4.8 Analyses of potassic rocks from Highwood Mountains, Montana, U.S.A. (After O
'
Brien et al. 1991)
SiO
2
TiO
2
Al
2
O
3
Cr
2
O
3
Fe
2
O
3
MnO
MgO
CaO
BaO
SrO
Na
2
O
2
OP
2
O
5
LOI
Total
1
47.24
0.67
12.54
0.06
9.15
0.16
10.72
8.97
0.50
0.16
2.80
4.85
0.78
2.28
100.90
2
49.74
0.83
13.21
0.01
9.40
0.16
6.24
9.55
0.57
0.21
3.07
6.25
0.99
0.64
100.90
3
51.40
0.60
16.90
0.01
6.80
0.10
3.30
5.36
0.60
0.22
2.89
8.85
0.57
2.11
99.67
4
-
52.88
0.63
17.34
7.95
0.20
1.30
5.08
2.37
1.36
0.30
8.61
0.18
1.82
100.00
5
46.79
0.77
10.86
0.12
10.01
0.17
14.14
7.75
0.22
0.10
2.12
4.59
0.63
1.93
100.20
6
47.33
0.59
12.77
0.04
8.59
0.15
9.28
9.22
0.45
0.14
1.80
6.48
0.92
1.37
99.13
7
46.29
0.62
8.05
0.08
8.78
0.15
16.84
9.18
0.56
0.13
2.21
5.01
0.83
2.11
100.80
8
58.94
0.21
17.83
0.01
2.83
0.08
1.51
2.76
0.82
0.16
2.83
10.89
0.18
1.24
100.30
1
2 Ma
c phonolites, Highwood Mountains, Montana
-
3
4 Leucite phonolites, Highwood Mountains, Montana
5 Olivine Minette, Highwood Mountains, Montana
6 Shonkinite, Highwood Mountains, Montana
7 Jumillite, Highwood Mountains, Montana
8 Tinguaite, Highwood Mountains, Montana
-
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