| Rock sample |
Ibity |
Tsarasaotra |
Antsahakely |
|||||||
| Granite |
Monzonite |
Granite dykes |
Granite |
|||||||
| IB-6 |
IB-6 |
IB-8 |
IB-14 |
IB-16A |
IB-16A |
TS-6 |
TS-3 |
TS-3 |
ANH-1 |
|
| wt% |
BI-1 |
BI-2 |
BI-1 |
BI-1 |
BI-1 |
BI-3 |
BI-2 |
BI-1 |
BI-2 |
BI-1 |
| SiO2 |
38.4 |
38.0 |
35.7 |
34.2 |
34.5 |
38.1 |
37.5 |
37.2 |
34.9 |
34.8 |
| TiO2 |
2.28 |
2.26 |
1.13 |
2.16 |
2.32 |
2.68 |
2.89 |
3.11 |
2.69 |
1.98 |
| Al2O3 |
16.9 |
17.3 |
17.4 |
17.0 |
16.9 |
16.7 |
14.9 |
14.9 |
14.6 |
18.8 |
| FeO |
19.5 |
19.8 |
23.7 |
25.6 |
20.9 |
17.8 |
17.4 |
18.3 |
18.2 |
24.3 |
| MnO |
0.62 |
0.59 |
0.53 |
0.71 |
0.65 |
0.40 |
0.43 |
0.44 |
0.43 |
0.45 |
| MgO |
6.03 |
5.71 |
3.68 |
4.56 |
11.6 |
10.2 |
11.6 |
11.2 |
11.3 |
4.83 |
| CaO |
- |
0.05 |
0.04 |
0.01 |
0.26 |
0.01 |
0.03 |
0.03 |
0.01 |
0.30 |
| Na2O |
0.05 |
0.08 |
0.04 |
0.07 |
0.07 |
0.09 |
0.06 |
0.05 |
0.04 |
0.03 |
| K2O |
10.7 |
10.6 |
10.0 |
10.6 |
6.06 |
9.91 |
10.6 |
10.4 |
11.1 |
7.7 |
| Li2O |
0.59 |
1.32 |
0.66 |
0.23 |
0.08 |
0.12 |
0.08 |
0.09 |
0.08 |
0.39 |
| Total |
95.0 |
95.7 |
93.0 |
95.2 |
93.3 |
95.9 |
95.5 |
95.8 |
93.3 |
93.5 |
| Number of cations recalculated on the basis of 11 oxygens. |
||||||||||
| Si |
5.87 |
5.76 |
5.71 |
5.46 |
5.34 |
5.71 |
5.69 |
5.65 |
5.51 |
5.48 |
| AlIV |
2.13 |
2.24 |
2.29 |
2.54 |
2.66 |
2.29 |
2.31 |
2.35 |
2.49 |
2.52 |
| AlVI |
0.91 |
0.85 |
1.00 |
0.66 |
0.42 |
0.66 |
0.37 |
0.32 |
0.23 |
0.96 |
| Ti |
0.26 |
0.26 |
0.14 |
0.26 |
0.27 |
0.30 |
0.33 |
0.36 |
0.32 |
0.23 |
| Fe |
2.49 |
2.51 |
3.18 |
3.42 |
2.71 |
2.23 |
2.21 |
2.33 |
2.40 |
3.20 |
| Mn |
0.08 |
0.08 |
0.07 |
0.10 |
0.09 |
0.05 |
0.06 |
0.06 |
0.06 |
0.06 |
| Mg |
1.38 |
1.29 |
0.88 |
1.09 |
2.69 |
2.27 |
2.62 |
2.54 |
2.65 |
1.13 |
| Ca |
- |
0.01 |
0.01 |
0.00 |
0.04 |
0.00 |
0.00 |
0.00 |
0.00 |
0.05 |
| Na |
0.01 |
0.02 |
0.01 |
0.02 |
0.02 |
0.02 |
0.02 |
0.01 |
0.01 |
0.01 |
| K |
2.08 |
2.05 |
2.04 |
2.17 |
1.20 |
1.90 |
2.05 |
2.02 |
2.23 |
1.55 |
| Li |
0.36 |
0.80 |
0.43 |
0.14 |
0.05 |
0.07 |
0.05 |
0.05 |
0.05 |
0.25 |
| XMg |
0.36 |
0.34 |
0.22 |
0.24 |
0.50 |
0.50 |
0.54 |
0.52 |
0.53 |
0.26 |
| XNa |
0.01 |
0.01 |
0.01 |
0.01 |
0.02 |
0.01 |
0.01 |
0.01 |
0.01 |
0.01 |
| Mg-Li |
1.01 |
0.49 |
0.45 |
0.94 |
2.64 |
2.20 |
2.57 |
2.49 |
2.60 |
0.89 |
| Fe + Mn + Ti-AlVI |
1.93 |
2.00 |
2.38 |
3.12 |
2.64 |
1.92 |
2.23 |
2.42 |
2.55 |
2.54 |