Corrigendum to ‘Parental Magma Composition of the Main Zone of the Bushveld Complex: Evidence from <i>in situ</i> LA-ICP-MS Trace Element Analysis of Silicate Minerals in the Cumulate Rocks’
Bibliographic record
Abstract
Journal of Petrology, 2019, Vol. 60, No. 2, 359–392, doi:10.1093/petrology/egy115 In the following, we correct factual errors and provide clarifications on the samples we studied. We note, however, that these corrections do not affect any of the conclusions of our original study. The locations of the Union section and the borehole were shown incorrectly in fig. 1 of the original study (Yang et al., 2019). The correct locations are indicated in the revised Fig. 1 provided here. Simplified geological map of the Bushveld Complex, adapted from Maier et al. (2013). TML, Thabazimbi–Murchison lineament. Simplified geological map of the Bushveld Complex, adapted from Maier et al. (2013). TML, Thabazimbi–Murchison lineament. There is debate in the literature on the exact position of the boundary between the Main Zone and the Upper Zone (Von Gruenewaldt, 1973; Molyneux, 1974; Klemm et al., 1985; Sharpe, 1985; Kruger et al., 1987; Kruger, 1990; Mitchell, 1990; Mitchell & Scoon, 1991; Scoon & Mitchell, 1994; Mitchell et al., 1998; Maier et al., 2013). We followed the system of Kruger et al. (1987), Kruger (1990), and Maier et al. (2013), who placed the base of the Upper Zone at the level of the Pyroxenite Marker. Further, we cited Mitchell (1990) for most of the textural and modal observations listed. These observations were in fact taken from Mitchell (1986). The samples used in this study were obtained from Andrew Mitchell’s collection at Rhodes University and were originally studied by Mitchell (1986). In fig. 2 of the original study, we plotted the orthopyroxene data tabulated by Mitchell next to ours. We note that more comprehensive clinopyroxene and plagioclase data were also previously presented by Mitchell (1990) and Scoon & Mitchell (1994), in the form of diagrams. We note, however, that our new analyses are generally consistent with these previous results. Finally, we would like to clarify that Mitchell et al. (1998) suggested that the presence of iron oxide minerals with clearly higher Mn and V contents represented by our sample A238 may reflect a late-stage downward migration of iron-rich liquid.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.015 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.004 | 0.006 |
| Insufficient payload (model declined to judge) | 0.082 | 0.045 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".