Table 1. U-Pb age data and 176Lu-176Hf systematics of NWA 7034 zircons and Hf isotope composition of the 91500 terrestrial zircon standard.
Age uncertainties are 2σ. Hf isotope ratios are reported normalized to the composition of the JMC-475 Hf standard. Uncertainties on the Hf isotope ratios reflect the 2SE internal precision in last decimal places. The external reproducibility of the 176Hf/177Hf ratio is estimated to be 22 ppm based on the analyses of the seven 91500 zircon aliquots. U-Pb data are reported in full in Table S1.
| Sample |
207Pb/206Pb age (Ma) |
207Pb/235U age (Ma) |
206Pb/238U age (Ma) |
176Lu/177Hf | 176Hf/177Hf | 178Hf/177Hf | 180Hf/177Hf | εHfT |
|---|---|---|---|---|---|---|---|---|
| S22b4 | 4448.7±1.8 | 4445.1±6.3 | 4437.3±22.1 | 0.000805 | 0.279891±10 | 1.46718±2 | 1.88666±6 | -1.92±0.37 |
| S22b5 | 4474.2±1.4 | 4457.8±5.7 | 4421.9±19.8 | 0.000799 | 0.279907±09 | 1.46719±2 | 1.88666±5 | -0.71±0.32 |
| S23b9 | 4447.0±1.5 | 4441.0±4.8 | 4427.7±16.5 | 0.000911 | 0.279908±16 | 1.46721±2 | 1.88669±6 | -1.70±0.58 |
| S24b2 | 4429.7±1.0 | 4355.2±4.3 | 4195.9±12.8 | 0.001057 | 0.279922±06 | 1.46719±2 | 1.88667±3 | -2.06±0.26 |
| S24b4 | 4474.0±0.8 | 4470.1±2.9 | 4461.4±9.9 | 0.001055 | 0.279906±06 | 1.46719±2 | 1.88667±3 | -1.57±0.26 |
| S24b7 | 4473.9±0.9 | 4476.8±2.8 | 4483.3±9.5 | 0.000742 | 0.279887±05 | 1.46720±1 | 1.88667±3 | -1.27±0.19 |
| S25b10 | 4476.3±0.9 | 4474.5±3.6 | 4470.6±12.5 | 0.001191 | 0.279926±07 | 1.46721±2 | 1.88669±4 | -1.21±0.30 |
| Average | 1.46720±2 | 1.88667±3 | ||||||
| 91500-1 | 0.282308±06 | 1.46721±1 | 1.88670±3 | |||||
| 91500-2 | 0.282314±11 | 1.46718±2 | 1.88674±4 | |||||
| 91500-3 | 0.282311±06 | 1.46718±2 | 1.88670±4 | |||||
| 91500-4 | 0.282311±05 | 1.46718±1 | 1.88668±2 | |||||
| 91500-5 | 0.282309±05 | 1.46719±1 | 1.88669±2 | |||||
| 91500-6 | 0.282309±06 | 1.46718±1 | 1.88664±2 | |||||
| 91500-7 | 0.282317±05 | 1.46718±1 | 1.88667±3 | |||||
| Average | 0.282311±06 | 1.46718±2 | 1.88669±6 | |||||