The petrogenesis and mantle source of Archean ferropicrites from the Western Superior Province, Ontario, Canada
Bibliographic record
Abstract
ABSTRACT The significance of Archean ferropicrites has been underappreciated in the past because many have been misidentified as varieties of komatiites. Ferropicrites from the Western Superior Province have distinctly higher Fe contents compared to komatiites at similar Mg contents. Enrichment in Ti, HFSE, and REE, combined with fractionated trace element profiles, indicate that these magmas are derived from a trace element enriched mantle source, which was distinct from that of komatiites. Interpolation of 5 GPa melting experiments on pyrolite and Martian mantle compositions indicates that the trace element enriched mantle source of the Western Superior Archean ferropicrites was olivine-dominated with a Mg # of ~ 85. The coexistence of ferropicrites and komatiites within the same greenstone belts indicates that the Archean mantle was compositionally heterogeneous, and the abundance of ferropicrites in the Western Superior Province suggests that ferropicrites may have been as abundant in the Archean as alkaline magmatism is today.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".