Multivariate Analysis, Mass Balance Techniques, and Statistical Tests as Tools in Igneous Petrology: Application to the Sierra de las Cruces Volcanic Range (Mexican Volcanic Belt)
Table 2
Major element composition (% m/m) and CIPW norm for the volcanic rocks from the Sierra de las Cruces rangea.
Sample
SC03
SC16
SC22
SC46
SC51
SC52
SC52a
SC53
SC58
SC60
Sector
SCT
SCT
SCT
SCN
SCN
SCN
SCN
SCS
SCS
SCS
TAS
D
A
BTA
D
D
D
BA
A
D
D
Major-element measured composition (% m/m)
SiO2
60.88
54.64
53.44
64.29
65.91
60.73
48.34
54.81
63.21
66.71
TiO2
0.981
0.912
1.542
0.661
0.583
0.785
1.636
1.128
0.695
0.582
Al2O3
16.72
19.80
15.51
15.98
15.24
16.10
16.91
18.99
16.89
15.85
4.57
5.43
8.66
4.28
4.00
5.43
9.35
6.67
5.00
3.90
MnO
0.099
0.092
0.136
0.065
0.061
0.062
0.105
0.103
0.073
0.062
MgO
6.12
2.23
6.71
1.52
2.02
2.43
6.59
2.34
1.37
1.68
CaO
5.57
2.66
7.43
3.69
3.87
4.44
5.56
4.59
4.30
3.90
Na2O
2.97
3.47
3.98
4.07
4.01
4.01
2.36
3.68
4.40
4.56
K2O
0.80
0.80
1.53
2.50
2.52
1.89
1.30
0.84
1.68
2.23
P2O5
0.14
0.22
0.63
0.18
0.18
0.21
0.19
0.26
0.13
0.17
LOI
0.60
8.95
0.11
2.70
2.30
3.01
7.59
7.01
3.06
0.24
Total
99.430
99.204
99.678
99.906
100.704
99.097
99.931
100.421
100.808
99.884
CIPW norm
Q
18.730
23.358
—
20.600
21.530
16.476
5.223
16.302
18.988
20.458
Or
4.621
5.260
9.142
15.123
15.182
11.672
8.386
5.342
10.194
13.261
Ab
25.520
32.678
34.050
35.539
34.591
35.463
21.797
33.517
38.230
38.839
An
27.132
13.089
20.155
17.677
16.451
21.265
28.762
22.684
21.039
16.298
C
1.230
9.925
—
0.330
—
—
2.145
4.633
0.333
—
Di
—
—
10.431
—
1.568
0.264
—
—
—
1.685
Hy
18.933
11.093
18.543
7.305
7.560
10.617
26.668
12.075
7.579
6.444
Ol
—
—
0.202
—
—
—
—
—
—
—
Mt
1.612
2.099
3.040
1.695
1.564
2.178
3.146
2.494
1.970
1.506
Il
1.892
1.928
2.961
1.295
1.128
1.557
3.392
2.306
1.356
1.113
Ap
0.329
0.568
1.476
0.431
0.424
0.507
0.480
0.649
0.308
0.396
Mg-v
77.719
51.684
66.871
48.905
57.634
54.66
63.940
47.752
42.473
53.718
FeOt/MgO
0.672
2.191
1.161
2.533
1.782
2.01
1.277
2.565
3.283
2.089
TAS: rock classification following the Le Bas et al [36] scheme. A: andesite, BA: basaltic andesite, BTA: basaltic trachyandesite, and D: dacite. Adjusted composition (% m/m) and CIPW norm calculated applying SINCLAS program [14, 15]. Mg-v = /(), atomic; and calculated from adjusted FeO and Fe2O3 following Middlemost [34].
