Extended Data Table 1. Ruthenium isotope data for ultramafic rocks.
| Sample* | Rock† | n‡ | ε96Ru§ | ± | ε98Ru§ | ± | ε100Ru§ | ± | ε102Ru§ | ± | ε104Ru§ | ± |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Greenland | ||||||||||||
| Itsaq gneiss complex (IGC) | ||||||||||||
| Narssaq ultramafic body (NUB), 3.8 Gyr | ||||||||||||
| 10_9 | H | 1 | 0.13 | 0.43 | -0.04 | 0.49 | 0.19 | 0.12 | 0.10 | 0.16 | 0.17 | 0.30 |
| replicate | H | 2 | 0.28 | 0.43 | 0.42 | 0.49 | 0.30 | 0.12 | 0.13 | 0.16 | -0.01 | 0.30 |
| 10_11 | D | 2 | -0.07 | 0.43 | 0.29 | 0.49 | 0.34 | 0.12 | 0.08 | 0.16 | -0.10 | 0.30 |
| South of the Isua supracrustal belt (SOISB), 3.8 Gyr | ||||||||||||
| 10_27 | H | 1 | (1.19)¶ | 0.43 | 0.33 | 0.49 | 0.23 | 0.12 | 0.03 | 0.16 | 0.04 | 0.30 |
| replicate | 1 | 0.03 | 0.43 | 0.58 | 0.49 | 0.23 | 0.12 | 0.18 | 0.16 | 0.00 | 0.30 | |
| Ujaragssuit Nunât complex, 3.8 Gyr | ||||||||||||
| 194856 | Chr | 6 | -0.04 | 0.20 | 0.18 | 0.17 | 0.17 | 0.09 | 0.06 | 0.06 | -0.10 | 0.08 |
| replicate | 5 | -0.27 | 0.29 | 0.04 | 0.35 | 0.15 | 0.11 | 0.07 | 0.04 | -0.03 | 0.13 | |
| replicate | 3 | -0.25 | 0.43 | 0.40 | 0.49 | 0.35 | 0.12 | 0.13 | 0.16 | -0.11 | 0.30 | |
| 194857 | Chr | 10 | -0.20 | 0.09 | 0.06 | 0.18 | 0.19 | 0.03 | 0.12 | 0.06 | 0.00 | 0.08 |
| replicate | 5 | -0.17 | 0.22 | 0.17 | 0.31 | 0.16 | 0.08 | 0.06 | 0.17 | -0.08 | 0.16 | |
| replicate | 11 | -0.09 | 0.20 | 0.10 | 0.18 | 0.13 | 0.04 | 0.05 | 0.05 | -0.11 | 0.11 | |
| 194882B | Chr | 3 | 0.03 | 0.43 | 0.30 | 0.49 | 0.19 | 0.12 | 0.07 | 0.16 | 0.13 | 0.30 |
| 194884C | Chr | 7 | -0.17 | 0.11 | 0.06 | 0.14 | 0.24 | 0.07 | 0.09 | 0.09 | -0.08 | 0.09 |
| Isua supracrustal belt (ISB), 3.7 Gyr | ||||||||||||
| 194907 | D | 1 | -0.23 | 0.43 | 0.24 | 0.49 | 0.26 | 0.12 | 0.10 | 0.16 | -0.20 | 0.30 |
| Mean IGC (n=14)‖ | -0.08 | 0.1 | 0.22 | 0.10 | 0.22 | 0.04 | 0.09 | 0.02 | -0.03 | 0.06 | ||
| 2 s.d. IGC‖ | 0.33 | 0.35 | 0.14 | 0.08 | 0.20 | |||||||
| Seqi ultramafic complex, >3.0 Gyr | ||||||||||||
| 186466 | Chr | 2 | -0.44 | 0.43 | -0.10 | 0.49 | 0.20 | 0.12 | 0.04 | 0.16 | -0.29 | 0.30 |
| replicate | 2 | -0.14 | 0.43 | 0.60 | 0.49 | 0.13 | 0.12 | 0.04 | 0.16 | -0.13 | 0.30 | |
| 186479 | Chr | 3 | 0.10 | 0.43 | 0.30 | 0.49 | 0.20 | 0.12 | 0.08 | 0.16 | -0.17 | 0.30 |
| Australia | ||||||||||||
| Pilbara craton, Warawoona Group, 3.5-3.2 Gyr | ||||||||||||
| Pil 16-61 | Chr | 3 | -0.03 | 0.43 | -0.11 | 0.49 | 0.05 | 0.12 | 0.01 | 0.16 | -0.02 | 0.30 |
| replicate | 3 | -0.25 | 0.43 | -0.17 | 0.49 | 0.05 | 0.12 | -0.06 | 0.16 | -0.05 | 0.30 | |
| Canada | ||||||||||||
| Abitibi greenstone belt, 2.7 Gyr | ||||||||||||
| OKUM | Kom | 1 | 0.24 | 0.43 | 0.58 | 0.49 | 0.07 | 0.12 | -0.03 | 0.16 | 0.08 | 0.30 |
| South Africa | ||||||||||||
| Bushveld igneous complex, 2.05 Gyr | ||||||||||||
| UG-2 | Chr | 20 | -0.12 | 0.08 | -0.06 | 0.10 | 0.00 | 0.02 | 0.03 | 0.04 | 0.05 | 0.07 |
| replicate | 29 | -0.12 | 0.08 | 0.03 | 0.08 | 0.01 | 0.02 | -0.01 | 0.03 | -0.06 | 0.06 | |
| replicate | 19 | -0.11 | 0.10 | 0.13 | 0.11 | 0.04 | 0.02 | 0.04 | 0.04 | 0.05 | 0.07 | |
| replicate | 11 | -0.11 | 0.15 | 0.18 | 0.11 | 0.02 | 0.05 | 0.01 | 0.04 | -0.02 | 0.10 | |
| replicate | 5 | -0.08 | 0.47 | -0.19 | 0.44 | -0.02 | 0.12 | -0.02 | 0.11 | 0.06 | 0.23 | |
| replicate | 2 | -0.15 | 0.43 | -0.34 | 0.49 | -0.03 | 0.12 | -0.03 | 0.16 | 0.08 | 0.30 | |
| replicate | 6 | -0.31 | 0.25 | 0.13 | 0.31 | -0.03 | 0.05 | -0.02 | 0.07 | 0.08 | 0.10 | |
| replicate | 11 | 0.02 | 0.12 | -0.01 | 0.16 | 0.03 | 0.03 | -0.02 | 0.05 | -0.04 | 0.09 | |
| LG-6 | Chr | 4 | -0.20 | 0.28 | 0.05 | 0.32 | 0.01 | 0.09 | -0.01 | 0.09 | -0.04 | 0.18 |
| Mean Bushveld (n=9)‖ | -0.13 | 0.07 | -0.01 | 0.13 | 0.00 | 0.02 | 0.00 | 0.02 | 0.02 | 0.04 | ||
| 2 s.d. Bushveld‖ | 0.18 | 0.33 | 0.05 | 0.05 | 0.12 | |||||||
H: harzburgite, D: dunite, Chr: chromitite, Kom: komatiite.
Ruthenium concentrations reported for the same samples or samples from the same locality. Italicized values indicate Ru concentrations determined in this study as described in methods section.
Number of individual NiS digestions (n) and amount of sample material (in g) taken for each single NiS digestion processed for each sample and replicate sample analysis. In cases where different numbers of NiS digestions were processed for a replicate sample analysis this is indicated by the number in parenthesis. If not stated otherwise the same number of NiS digestions was used for all replicates.
Re-Os isotope data reported for the same samples or for samples of similar composition from the same locality. Note that the different ranges reported for chromitite samples from the Ujaragssuit Nunât complex were not obtained for the same samples and represent data reported by different previous studies for chromitites from the same locality or sampling area.
Age used for calculation of the initial 187Os/188Os isotope composition as quoted in literature.
Initial 187Os/188Os isotope composition calculated at the time of emplacement of the samples.
yOs values refer to the relative deviation in % of the calculated initial 187Os/188Os isotope compositions of samples relative to the chondritic Os isotope composition at the time of emplacement of the samples.
References for Ru concentration and Os isotope data.