Rare Earth Elements in the Sudbury Nickel Irruptive' Comparison with Layered Gabbros and Implications
Bibliographic record
Abstract
The rare earth element content of rocks from the Sudbury Nickel Irruptive has been determined by neutron activation analysis. The Irruptive rocks are characterized by high absolute rare earth element contents and chondrite-normalized rare earth element fractionation patterns which show strong enrichment of light, relative to heavy rare earth elements. Correlative rock units from the north and south ranges have very similar chondrite-normalized rare earth element fractionation patterns. Micropegmatites and norites are characterized by negative and positive Eu anomalies, respectively, whereas border norites and oxide-rich gabbros lack prominent Eu anomalies. The Irruptive border norites are considered to have crystallized as a relatively closed system and their rare earth element fractionation patterns are regarded as representative of the parental Irruptive magma. The mirror-image Eu anomaly characteristics of the micropegmatite and norite and the likelihood that they arise from a nonanomalous parental magma indicate that these rocks are comagmatic and that they are related by gravitational fractional crystallization processes. The norites represent cumulates and the
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".