Olivine–liquid partitioning of vanadium and other trace elements; with applications to modern and ancient picrites. Canadian Mineralogist 39
Bibliographic record
Abstract
The partitioning of V, Ti, Sc, Cr, Ni, Zn, Ga, Zr, La and Yb between olivine and coexisting basaltic and komatiitic liquids was measured at known fugacity of oxygen, f(O2). Olivine and glass were analyzed for trace elements using laser-ablation inductively coupled plasma – mass spectrometry (LA–ICP–MS). The purpose of the study was to further refine an empirical oxygen barom-eter for picritic magmas (>10 % MgO) based on the comparison of the f(O2)-dependent behavior of V with that of other incompat-ible and immobile trace elements (Ti, Sc, Ga, Zr and Yb) along the liquid line of descent. Results of this study present an improvement on the earlier estimates of redox conditions that utilized this approach because the partition coefficients for V and other incompatible trace elements (Ti, Sc, Ga, Zr and Yb) are measured in the same bulk-compositions under the same experi-mental conditions, eliminating any previous bias or correlations. The advantages and limits of the approach are demonstrated in applications to modern Hawaiian picrites, Archean komatiitic lavas and lunar rocks. Uncertainties in the method are significant [about ± 0.5 log f(O2) units], but it is applicable to mafic suites having an igneous phase-assemblage altered by metamorphism, or without a phase assemblage to which more conventional estimates of redox conditions can be applied. In many cases, crucial estimates of the minimum f(O2) can be made for many terrestrial and extraterrestrial rocks in the geological record.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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".