Open Access
Table 3a
Representative microprobe analyses of selected minerals.
| Samples | GDB8 | SP3B | SAN | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mineral | g | g | bi | pl | cd | g | bi | pl | st | bi | pl | mu | chl | ||||||||||||||||||||
| Position | Rim | Core | Rim | Core | in g | in cd | matrix | in g | matrix | in g | matrix | Rim | Core | Rim | Core | ||||||||||||||||||
| SiO2 | 38.24 | 39.85 | 38.17 | 37.98 | 36.89 | 36.01 | 35.85 | 62.37 | 61.75 | 49.93 | 50.43 | 37.22 | 36.76 | 35.82 | 60.2 | 24.615 | 36.84 | 36.75 | 63.31 | 45.78 | 26.06 | ||||||||||||
| TiO2 | 0.00 | 0.00 | 0.01 | 0.00 | 5.13 | 4.00 | 4.99 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 2.48 | 0.00 | 0.392 | 1.41 | 1.35 | 0.00 | 0.42 | 0.09 | ||||||||||||
| Al2O3 | 20.86 | 21.65 | 22.23 | 21.75 | 16.22 | 17.6 | 15.5 | 23.82 | 23.64 | 33.52 | 33.69 | 21.04 | 20.65 | 17.53 | 24.52 | 48.007 | 19.28 | 18.87 | 23.49 | 35.03 | 23.26 | ||||||||||||
| Fetot as FeO | 31.16 | 27.79 | 28.24 | 28.57 | 8.74 | 14.82 | 14.91 | 0.05 | 0.06 | 3.53 | 4.48 | 29.18 | 30.24 | 18.47 | 0.07 | 21.56 | 14.99 | 15.45 | 0.12 | 2.18 | 18.48 | ||||||||||||
| MnO | 2.09 | 1.7 | 2.46 | 2.43 | 0.00 | 0.07 | 0.11 | 0.00 | 0.02 | 0.06 | 0.08 | 8.46 | 7.02 | 0.26 | 0.01 | 0.75 | 0.14 | 0.2 | 0.00 | 0.00 | 0.3 | ||||||||||||
| MgO | 6.05 | 9.06 | 8.22 | 8.31 | 17.13 | 12.59 | 12.76 | 0.02 | 0.00 | 11.3 | 10.87 | 2.68 | 3.11 | 10.06 | 0.00 | 1.705 | 12.41 | 12.17 | 0.00 | 0.49 | 17.92 | ||||||||||||
| CaO | 0.99 | 0.94 | 0.94 | 0.85 | 0.00 | 0.00 | 0.00 | 5.37 | 5.33 | 0.04 | 0.02 | 2.11 | 2.08 | 0.00 | 6.91 | 0.00 | 0.01 | 0.00 | 4.58 | 0.00 | 0.04 | ||||||||||||
| Na2O | 0.00 | 0.05 | 0.00 | 0.00 | 0.19 | 0.04 | 0.96 | 9.45 | 9.15 | 0.04 | 0.06 | 0.00 | 0.05 | 0.05 | 8.48 | 0.007 | 0.25 | 0.28 | 8.92 | 1.52 | 0.11 | ||||||||||||
| K2O | 0.01 | 0.02 | 0.00 | 0.03 | 9.98 | 10.02 | 9.77 | 0.33 | 0.24 | 0.00 | 0.01 | 0.01 | 0.01 | 9.99 | 0.09 | 0.00 | 9.03 | 9.4 | 0.03 | 8.99 | 0.54 | ||||||||||||
| Cr2O3 | 0.01 | 0.02 | 0.03 | 0.01 | 0.02 | 0.09 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.02 | 0.00 | 0.028 | 0.04 | 0.00 | 0.01 | 0.00 | 0.04 | ||||||||||||
| BaO | b.d.l | b.d.l | b.d.l | b.d.l | 0.18 | 0.15 | 0.19 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.32 | 0.00 | 0.00 | 0.11 | 0.14 | 0.00 | 0.45 | 0.00 | ||||||||||||
| Total | 99.41 | 101.07 | 100.3 | 99.95 | 95.43 | 96.29 | 95.08 | 101.42 | 100.19 | 98.42 | 99.65 | 100.72 | 99.92 | 95.38 | 100.27 | 97.07 | 95.21 | 94.96 | 100.46 | 94.86 | 86.89 | ||||||||||||
| ox | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 8 | 8 | 18 | 18 | 12 | 12 | 11 | 8 | 46 | 11 | 11 | 8 | 22 | 14 | ||||||||||||
| Si | 3.03 | 3.04 | 2.96 | 2.96 | 2.71 | 2.70 | 2.71 | 2.74 | 2.74 | 5.02 | 5.03 | 2.98 | 2.97 | 2.74 | 2.68 | 7.26 | 2.75 | 2.76 | 2.79 | 3.07 | 2.68 | ||||||||||||
| Ti | 0.00 | 0.00 | 0.00 | 0.00 | 0.28 | 0.23 | 0.28 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.09 | 0.08 | 0.08 | 0.00 | 0.02 | 0.01 | ||||||||||||
| Al | 1.95 | 1.95 | 2.03 | 2.00 | 1.41 | 1.55 | 1.38 | 1.23 | 1.24 | 3.97 | 3.96 | 1.99 | 1.96 | 1.58 | 1.29 | 16.70 | 1.70 | 1.67 | 1.22 | 2.77 | 2.82 | ||||||||||||
| Cr | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 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 | ||||||||||||
| Fe3+ | 0.00 | 0.00 | 0.06 | 0.09 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.05 | 0.11 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | ||||||||||||
| Mg | 0.72 | 1.03 | 0.95 | 0.96 | 1.88 | 1.41 | 1.44 | 0.00 | 0.00 | 1.69 | 1.62 | 0.32 | 0.37 | 1.15 | 0.00 | 0.75 | 1.38 | 1.36 | 0.00 | 0.05 | 2.74 | ||||||||||||
| Fe2+ | 2.07 | 1.77 | 1.77 | 1.76 | 0.54 | 0.93 | 0.94 | 0.00 | 0.00 | 0.30 | 0.37 | 1.91 | 1.91 | 1.18 | 0.00 | 3.36 | 0.94 | 0.97 | 0.00 | 0.12 | 1.59 | ||||||||||||
| Mn | 0.14 | 0.11 | 0.16 | 0.16 | 0.00 | 0.01 | 0.01 | 0.00 | 0.00 | 0.01 | 0.01 | 0.57 | 0.48 | 0.02 | 0.00 | 0.19 | 0.01 | 0.01 | 0.00 | 0.00 | 0.03 | ||||||||||||
| Ca | 0.08 | 0.08 | 0.08 | 0.07 | 0.00 | 0.00 | 0.00 | 0.25 | 0.25 | 0.00 | 0.00 | 0.18 | 0.18 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.22 | 0.00 | 0.00 | ||||||||||||
| Ba | 0.01 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | ||||||||||||||||
| Na | 0.00 | 0.01 | 0.00 | 0.00 | 0.03 | 0.01 | 0.14 | 0.81 | 0.79 | 0.01 | 0.01 | 0.00 | 0.01 | 0.01 | 0.73 | 0.00 | 0.04 | 0.04 | 0.76 | 0.20 | 0.02 | ||||||||||||
| K | 0.00 | 0.00 | 0.00 | 0.00 | 0.94 | 0.96 | 0.94 | 0.02 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.98 | 0.01 | 0.00 | 0.86 | 0.9 | 0.00 | 0.77 | 0.07 | ||||||||||||
| OH | 1.78 | 1.79 | 1.99 | 1.91 | 1.83 | 1.92 | 2.00 | 7.99 | |||||||||||||||||||||||||
| F | 0.22 | 0.21 | 0.00 | 0.09 | 0.17 | 0.08 | 0.00 | 0.00 | |||||||||||||||||||||||||
| Cl | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | |||||||||||||||||||||||||
| Total | 7.99 | 7.99 | 8.00 | 8.00 | 9.78 | 9.78 | 9.86 | 5.05 | 5.04 | 11.00 | 11.00 | 8.00 | 8.00 | 9.81 | 5.04 | 28.35 | 9.77 | 9.80 | 4.99 | 9.01 | 17.95 | ||||||||||||
| XAlm | 0.69 | 0.59 | 0.6 | 0.59 | 0.64 | 0.65 | |||||||||||||||||||||||||||
| XPrp | 0.24 | 0.34 | 0.32 | 0.33 | 0.11 | 0.13 | |||||||||||||||||||||||||||
| XGrs | 0.03 | 0.02 | 0.03 | 0.02 | 0.06 | 0.06 | |||||||||||||||||||||||||||
| XSps | 0.05 | 0.04 | 0.05 | 0.05 | 0.19 | 0.16 | |||||||||||||||||||||||||||
| XMg | 0.26 | 0.37 | 0.35 | 0.35 | 0.78 | 0.61 | 0.6 | 0.85 | 0.81 | 0.14 | 0.16 | 0.49 | 0.12 | 0.6 | 0.58 | 0.63 | |||||||||||||||||
| Xan | 0.23 | 0.24 | 0.31 | 0.22 | |||||||||||||||||||||||||||||
| Xab | 0.75 | 0.75 | 0.69 | 0.78 | |||||||||||||||||||||||||||||
| Xor | 0.02 | 0.01 | 0.00 | 0.00 | |||||||||||||||||||||||||||||
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