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Table 2
Summary of the U-Pb geochronological data obtained in this study.
| Locality | Sample | Age type | Age (Ma) | 2σ | 2σ uncertainty including long term variance | n | (207Pb/206Pb)0 | MSWD |
|---|---|---|---|---|---|---|---|---|
| Cassiterite U-Pb dating | ||||||||
| Petalite-rich pegmatites | ||||||||
| Bajoca | - | Intercept | 315 | 1 | 6 | 88 | 0.87 ± 0.01 | 1.0 |
| Bajoca | - | Concordia | 317 | 2 | 6 | 18 | _ | 1.0 |
| Ramalha | P016 | Intercept | 312 | 2 | 6 | 31 | 0.86 ± 0.02 | 0.3 |
| Pombal | P018 | Intercept | 314 | 1 | 6 | 29 | 1.09 ± 0.7 | 0.2 |
| Plombal | P018 | Concordia | 315 | 1 | 6 | 18 | _ | 0.8 |
| Hinojosa | ALM-2 | Intercept | 308 | 2 | 6 | 39 | 0.85 ± 0.01 | 1.6 |
| Li-mica-rich pegmatites | ||||||||
| Feli | MF1001c | Intercept | 310 | 2 | 6 | 30 | 0.85 ± 0.03 | 0.5 |
| - | P010 | Intercept | 313 | 2 | 6 | 27 | 0.83 ± 0.02 | 2.2 |
| Ramalha-East | ALM-3 | Intercept | 310 | 24 | 25 | 7 | 0.84 ± 0.01 | 4.6 |
| Ramalha-West | P017 | Intercept | 312 | 3 | 7 | 18 | 0.86 ± 0.01 | 6.8 |
| CGM U-Pb dating | ||||||||
| Petalite-rich pegmatite | ||||||||
| Bajoca | MB1001B | Mean 206Pb/238U | 309 | 3 | – | 8 | – | 0.5 |
| Li-mica-rich pegmatite | ||||||||
| Feli | MF1001C | Intercept | 308 | 4 | – | 15 | – | 1.2 |
| Feli | MF1001C | Mean 206Pb/238U | 308 | 3 | – | 15 | – | 0.4 |
| Feli | MF1001C | Concordia | 308 | 5 | – | 15 | – | 1.0 |
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