SiO2 | 36.19 | 35.56 | 35.91 | 35.93 | 36.16 | 35.54 | 36.60 | 35.51 |
TiO2 | 1.63 | 1.70 | 1.69 | 1.69 | 1.70 | 1.64 | 1.60 | 1.75 |
Al2O3 | 17.75 | 16.30 | 17.06 | 16.91 | 16.83 | 17.58 | 16.91 | 16.45 |
FeO | 21.16 | 21.27 | 20.92 | 20.95 | 20.92 | 21.25 | 20.54 | 21.44 |
MnO | 0.26 | 0.30 | 0.16 | 0.13 | 0.17 | 0.20 | 0.19 | 0.17 |
MgO | 9.20 | 9.21 | 9.33 | 9.15 | 9.26 | 8.81 | 9.35 | 9.12 |
CaO | 0.11 | 0.02 | 0.08 | 0.10 | 0.10 | 0.09 | 0.08 | 0.03 |
Na2O | 0.15 | 0.12 | 0.06 | 0.14 | 0.15 | 0.14 | 0.09 | 0.13 |
K2O | 8.42 | 9.06 | 8.59 | 8.84 | 8.88 | 8.67 | 8.67 | 8.67 |
Cl | 0.07 | 0.09 | 0.08 | 0.06 | 0.08 | 0.07 | 0.07 | 0.04 |
F | 0.00 | 0.01 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 |
Total | 94.94 | 93.64 | 93.88 | 93.91 | 94.25 | 93.99 | 94.1 | 93.31 |
Calculation based on 22 O | ||||||||
Si | 5.55 | 5.58 | 5.57 | 5.59 | 5.60 | 5.52 | 5.65 | 5.58 |
Aliv | 2.45 | 2.42 | 2.43 | 2.41 | 2.40 | 2.48 | 2.35 | 2.42 |
Sum T | 8.00 | 8.00 | 8.00 | 8.00 | 8.00 | 8.00 | 8.00 | 8.00 |
Alvi | 0.75 | 0.59 | 0.69 | 0.68 | 0.67 | 0.75 | 0.72 | 0.62 |
Ti | 0.19 | 0.20 | 0.20 | 0.20 | 0.20 | 0.19 | 0.19 | 0.21 |
Fe | 2.71 | 2.79 | 2.72 | 2.72 | 2.71 | 2.76 | 2.65 | 2.81 |
Mn | 0.03 | 0.04 | 0.02 | 0.02 | 0.02 | 0.03 | 0.02 | 0.02 |
Mg | 2.10 | 2.15 | 2.16 | 2.12 | 2.14 | 2.04 | 2.15 | 2.13 |
Sum Y | 5.79 | 5.78 | 5.79 | 5.74 | 5.74 | 5.77 | 5.74 | 5.80 |
Ca | 0.02 | 0.00 | 0.01 | 0.02 | 0.02 | 0.01 | 0.01 | 0.01 |
Na | 0.04 | 0.04 | 0.02 | 0.04 | 0.05 | 0.04 | 0.03 | 0.04 |
K | 1.65 | 1.81 | 1.70 | 1.75 | 1.75 | 1.72 | 1.71 | 1.74 |
Sum X | 1.71 | 1.85 | 1.73 | 1.81 | 1.82 | 1.78 | 1.75 | 1.78 |
Cl | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.01 |
F | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Fe + Mg | 4.81 | 4.94 | 4.87 | 4.84 | 4.85 | 4.80 | 4.80 | 4.95 |
Fe/Fe + Mg | 0.56 | 0.56 | 0.56 | 0.56 | 0.56 | 0.57 | 0.55 | 0.57 |
Fe + Mn + Ti-Alvi | 2.18 | 2.44 | 2.24 | 2.25 | 2.26 | 2.23 | 2.14 | 2.42 |
SiO2 | 0.10 | 0.05 | 0.75 | 0.02 | 0.33 | 0.49 | 0.64 | 0.06 |
TiO2 | 53.53 | 53.00 | 52.33 | 52.75 | 51.46 | 51.34 | 53.03 | 52.24 |
Al2O3 | 0.00 | 0.00 | 0.43 | 0.02 | 0.03 | 0.14 | 0.22 | 0.00 |
FeO | 43.13 | 42.64 | 40.71 | 42.42 | 42.42 | 41.53 | 41.01 | 42.01 |
MnO | 3.61 | 3.24 | 3.58 | 3.70 | 3.42 | 3.40 | 3.93 | 3.37 |
MgO | 0.04 | 0.07 | 0.10 | 0.06 | 0.13 | 0.17 | 0.19 | 0.14 |
CaO | 0.15 | 0.11 | 0.92 | 0.11 | 0.98 | 0.85 | 0.21 | 0.86 |
Na2O | 0.02 | 0.04 | 0.02 | 0.02 | 0.03 | 0.02 | 0.01 | 0.00 |
K2O | 0.04 | 0.08 | 0.00 | 0.20 | 0.08 | 0.03 | 0.24 | 0.02 |
Cr2O3 | 0.01 | 0.04 | 0.00 | 0.00 | 0.04 | 0.01 | 0.00 | 0.00 |
Total | 100.63 | 99.27 | 98.84 | 99.30 | 98.93 | 97.97 | 99.48 | 98.69 |
The recalculated chemical composition based on an inverse spinel formula | ||||||||
SiO2 | 0.10 | 0.05 | 0.75 | 0.02 | 0.33 | 0.49 | 0.64 | 0.06 |
TiO2 | 53.53 | 53.00 | 52.33 | 52.75 | 51.46 | 51.34 | 53.03 | 52.24 |
Al2O3 | 0.00 | 0.00 | 0.43 | 0.02 | 0.03 | 0.14 | 0.22 | 0.00 |
Fe2O3 | 0.00 | 0.00 | 0.00 | 0.00 | 0.77 | 0.00 | 0.00 | 0.00 |
FeO | 44.36 | 44.17 | 42.99 | 43.49 | 41.72 | 41.92 | 43.88 | 42.30 |
MnO | 3.61 | 3.24 | 3.58 | 3.70 | 3.42 | 3.40 | 3.93 | 3.37 |
MgO | 0.04 | 0.07 | 0.10 | 0.06 | 0.13 | 0.17 | 0.19 | 0.14 |
CaO | 0.15 | 0.11 | 0.92 | 0.11 | 0.98 | 0.85 | 0.21 | 0.86 |
Na2O | 0.02 | 0.04 | 0.02 | 0.02 | 0.03 | 0.02 | 0.01 | 0.00 |
K2O | 0.04 | 0.08 | 0.00 | 0.20 | 0.08 | 0.03 | 0.24 | 0.02 |
Cr2O3 | 0.01 | 0.04 | 0.00 | 0.00 | 0.04 | 0.01 | 0.00 | 0.00 |
Total | 101.85 | 100.81 | 101.11 | 100.36 | 99.00 | 98.36 | 102.35 | 98.98 |
Calculation based on 3 O | ||||||||
Si | 0.00 | 0.00 | 0.02 | 0.00 | 0.01 | 0.01 | 0.02 | 0.00 |
Ti | 1.01 | 1.01 | 1.00 | 1.01 | 0.98 | 0.99 | 1.01 | 1.00 |
Al | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 |
Fe+3 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 |
Fe+2 | 0.93 | 0.94 | 0.91 | 0.92 | 0.89 | 0.90 | 0.93 | 0.90 |
Mn | 0.08 | 0.07 | 0.08 | 0.08 | 0.07 | 0.07 | 0.08 | 0.07 |
Mg | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.01 | 0.01 | 0.01 |
Ca | 0.00 | 0.00 | 0.02 | 0.00 | 0.03 | 0.02 | 0.01 | 0.02 |
Na | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
K | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.01 | 0.00 |
Cr | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Total | 2.03 | 2.04 | 2.05 | 2.03 | 2.00 | 2.01 | 2.07 | 2.01 |
ARM interior amphibole | ARM exterior amphibole | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | 51.53 | 54.90 | 53.57 | 54.41 | 52.83 | 53.31 | 54.67 | 53.8 | 43.19 | 49.02 | 49.29 | 50.38 | 46.78 | 47.71 | 48.89 | 0.45 |
TiO2 | 0.17 | 0.00 | 0.08 | 0.05 | 0.07 | 0.05 | 0.05 | 0.02 | 0.27 | 0.36 | 0.33 | 0.34 | 0.28 | 0.36 | 0.21 | 0.45 |
Al2O3 | 3.72 | 0.50 | 1.73 | 0.60 | 1.56 | 2.13 | 0.24 | 1.54 | 12.41 | 6.16 | 5.97 | 4.67 | 8.62 | 7.68 | 7.26 | 11.86 |
Cr2O3 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.05 | 0.00 | 0.07 | 0.04 | 0.06 | 0.08 | 0.03 | 0.07 | 0.00 |
FeO | 16.56 | 15.86 | 15.05 | 14.11 | 16.32 | 15.76 | 15.47 | 14.86 | 19.09 | 17.70 | 17.33 | 17.5 | 17.91 | 18.3 | 17.94 | 18.37 |
MnO | 0.40 | 0.51 | 0.41 | 0.42 | 0.40 | 0.43 | 0.53 | 0.36 | 0.38 | 0.52 | 0.41 | 0.49 | 0.33 | 0.45 | 0.49 | 0.29 |
MgO | 11.93 | 13.84 | 13.27 | 14.05 | 12.75 | 12.95 | 14.04 | 13.70 | 7.19 | 10.48 | 10.69 | 11.19 | 9.23 | 9.54 | 9.95 | 7.62 |
CaO | 11.70 | 10.94 | 11.90 | 11.96 | 11.95 | 11.65 | 11.30 | 12.01 | 11.50 | 11.61 | 11.52 | 11.24 | 11.53 | 11.24 | 11.14 | 11.53 |
Na2O | 0.32 | 0.06 | 0.15 | 0.09 | 0.13 | 0.21 | 0.04 | 0.11 | 0.91 | 0.57 | 0.46 | 0.43 | 0.69 | 0.69 | 0.46 | 0.87 |
K2O | 0.09 | 0.00 | 0.07 | 0.03 | 0.05 | 0.11 | 0.02 | 0.05 | 0.57 | 0.15 | 0.18 | 0.04 | 0.25 | 0.20 | 0.20 | 0.34 |
Total | 96.42 | 96.61 | 96.23 | 95.72 | 96.07 | 96.60 | 96.36 | 96.50 | 95.51 | 96.64 | 96.22 | 96.34 | 95.70 | 96.20 | 96.61 | 96.33 |
Calculation based on 23 O | ||||||||||||||||
Si | 7.65 | 8.03 | 7.90 | 8.01 | 7.86 | 7.86 | 8.02 | 7.90 | 6.63 | 7.32 | 7.37 | 7.52 | 7.08 | 7.17 | 7.30 | 6.79 |
Aliv | 0.35 | 0.00 | 0.10 | 0.00 | 0.14 | 0.14 | 0.00 | 0.10 | 1.37 | 0.68 | 0.63 | 0.48 | 0.92 | 0.83 | 0.70 | 1.21 |
Sum T | 8.00 | 8.03 | 8.00 | 8.01 | 8.00 | 8.00 | 8.02 | 8.00 | 8.00 | 8.00 | 8.00 | 8.00 | 8.00 | 8.00 | 8.00 | 8.00 |
Alvi | 0.30 | 0.09 | 0.20 | 0.10 | 0.14 | 0.23 | 0.04 | 0.17 | 0.87 | 0.40 | 0.42 | 0.34 | 0.61 | 0.53 | 0.57 | 0.90 |
Ti | 0.02 | 0.00 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.03 | 0.04 | 0.04 | 0.04 | 0.03 | 0.04 | 0.02 | 0.05 |
Fe3+ | 0.05 | 0.15 | 0.00 | 0.07 | 0.01 | 0.00 | 0.13 | 0.00 | 0.17 | 0.19 | 0.14 | 0.11 | 0.16 | 0.23 | 0.10 | 0.10 |
Cr | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 |
Mg | 2.64 | 3.02 | 2.92 | 3.08 | 2.83 | 2.85 | 3.07 | 3.00 | 1.65 | 2.33 | 2.38 | 2.49 | 2.08 | 2.14 | 2.21 | 1.72 |
Fe2+ | 1.99 | 1.74 | 1.86 | 1.67 | 2.02 | 1.92 | 1.76 | 1.82 | 2.28 | 2.02 | 2.01 | 2.02 | 2.10 | 2.06 | 2.07 | 2.22 |
Mn3+ | 0.00 | 0.00 | 0.02 | 0.05 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 |
Sum C | 5.00 | 5.00 | 5.00 | 4.98 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 |
Mg | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Fe2+ | 0.01 | 0.04 | 0.00 | 0.00 | 0.01 | 0.02 | 0.02 | 0.01 | 0.00 | 0.00 | 0.02 | 0.06 | 0.01 | 0.01 | 0.06 | 0.00 |
Mn2+ | 0.05 | 0.06 | 0.03 | 0.00 | 0.05 | 0.05 | 0.07 | 0.04 | 0.05 | 0.06 | 0.05 | 0.06 | 0.04 | 0.06 | 0.06 | 0.03 |
Ca | 1.86 | 1.71 | 1.88 | 1.89 | 1.91 | 1.84 | 1.78 | 1.89 | 1.89 | 1.86 | 1.85 | 1.80 | 1.87 | 1.81 | 1.78 | 1.86 |
Na | 0.07 | 0.02 | 0.04 | 0.03 | 0.04 | 0.06 | 0.01 | 0.03 | 0.06 | 0.09 | 0.09 | 0.08 | 0.08 | 0.12 | 0.10 | 0.11 |
Sum B | 2.00 | 1.84 | 1.96 | 1.91 | 2.00 | 1.97 | 1.87 | 1.97 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 |
Na | 0.02 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.21 | 0.08 | 0.05 | 0.04 | 0.12 | 0.08 | 0.04 | 0.15 |
K | 0.02 | 0.00 | 0.01 | 0.01 | 0.01 | 0.02 | 0.00 | 0.01 | 0.11 | 0.03 | 0.03 | 0.01 | 0.05 | 0.04 | 0.04 | 0.07 |
Sum A | 0.03 | 0.00 | 0.01 | 0.01 | 0.01 | 0.02 | 0.00 | 0.01 | 0.32 | 0.11 | 0.08 | 0.05 | 0.17 | 0.12 | 0.08 | 0.21 |
Total | 15.03 | 14.86 | 14.97 | 14.91 | 15.01 | 14.99 | 14.90 | 14.98 | 15.32 | 15.11 | 15.08 | 15.05 | 15.17 | 15.12 | 15.08 | 15.21 |
(Mg + Fe2+ + Mn2+) | 4.69 | 4.87 | 4.82 | 4.81 | 4.91 | 4.84 | 4.91 | 4.87 | 3.97 | 4.42 | 4.46 | 4.62 | 4.23 | 4.26 | 4.41 | 3.98 |
Mg/Mg + Fe2+ | 0.57 | 0.63 | 0.61 | 0.65 | 0.58 | 0.59 | 0.63 | 0.62 | 0.42 | 0.54 | 0.54 | 0.55 | 0.50 | 0.51 | 0.51 | 0.44 |
(Ca + Na)B | 1.94 | 1.73 | 1.92 | 1.91 | 1.94 | 1.90 | 1.79 | 1.92 | 1.95 | 1.94 | 1.93 | 1.88 | 1.95 | 1.93 | 1.88 | 1.97 |
(Na + K)A | 0.03 | 0.00 | 0.01 | 0.01 | 0.01 | 0.02 | 0.00 | 0.01 | 0.32 | 0.11 | 0.08 | 0.05 | 0.17 | 0.12 | 0.08 | 0.21 |
Point analysis | 1/1. | 1/2. | 1/3. | 1/4. | 1/5. | 1/6. | 1/7. | 1/8. | 1/9. | 1/10. | 1/11. | 1/12. |
---|---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | 0.00 | 0.01 | 0.00 | 0.03 | 0.04 | 3.67 | 0.04 | 0.05 | 0.02 | 0.02 | 0.03 | 0.00 |
TiO2 | 0.03 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.06 | 0.00 | 0.00 | 0.00 |
Al2O3 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.09 | 0.01 | 0.01 |
Cr2O3 | 0.00 | 0.00 | 0.05 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.00 | 0.03 | 0.00 | 0.00 |
FeO | 0.71 | 0.81 | 0.75 | 0.71 | 0.69 | 0.46 | 0.59 | 0.74 | 0.58 | 0.88 | 0.67 | 0.61 |
MnO | 0.61 | 0.81 | 0.55 | 0.71 | 0.63 | 0.40 | 0.67 | 0.65 | 0.53 | 0.73 | 0.52 | 0.64 |
MgO | 0.22 | 0.25 | 0.27 | 0.18 | 0.20 | 0.17 | 0.19 | 0.21 | 0.20 | 0.20 | 0.18 | 0.21 |
CaO | 62.85 | 63.89 | 63.09 | 58.71 | 59.24 | 54.71 | 57.73 | 58.41 | 58.06 | 52.38 | 56.2 | 59.45 |
Na2O | 0.03 | 0.00 | 0.03 | 0.03 | 0.01 | 0.00 | 0.05 | 0.05 | 0.00 | 0.06 | 0.00 | 0.00 |
K2O | 0.02 | 0.01 | 0.01 | 0.04 | 0.04 | 0.01 | 0.03 | 0.07 | 0.02 | 0.04 | 0.01 | 0.04 |
P2O5 | 0.00 | 0.01 | 0.05 | 0.00 | 0.03 | 0.05 | 0.06 | 0.05 | 0.00 | 0.08 | 0.03 | 0.00 |
BaO | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
F | 0.03 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.01 | 0.02 | 0.00 | 0.01 |
Cl | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.01 | 0.00 | 0.02 | 0.02 |
Total | 64.52 | 65.84 | 64.79 | 60.41 | 60.90 | 59.49 | 59.37 | 60.27 | 59.47 | 54.55 | 57.66 | 0. 61 |
(Fe + Mn)CO3 | 2.05 | 2.46 | 2.01 | 2.35 | 2.17 | 1.54 | 2.13 | 2.32 | 1.87 | 2.97 | 2.07 | 2.05 |
CaCO3 | 97.61 | 97.16 | 97.57 | 97.35 | 97.50 | 98.15 | 97.55 | 97.33 | 97.79 | 96.66 | 97.62 | 97.60 |
MgCO3 | 0.34 | 0.38 | 0.42 | 0.30 | 0.33 | 0.30 | 0.32 | 0.35 | 0.34 | 0.37 | 0.31 | 0.34 |