Chemical evolution and origin of nickel sulfide mineralization in the Sudbury igneous complex
Bibliographic record
Abstract
The Sudbury Igneous Complex is widely believed to be the result of melt generation due to meteorite im-pact, and the Ni and Cu ores associated with the sublayer and offsets of the complex are considered to be a consequence of this event. The noritic and granophyric rocks of the main mass have similar yet elevated ratios of large ion lithophile elements (LILE) and light rare earth elements (LREE) relative to high field strength el-ements (HFSE) and heavy rare earth elements (HREE). This indicates that the magma was homogenized in terms of the incompatible trace element ratios and had a large chemical and isotopic contribution from an upper crustal source. Through the mafic and felsic norite there is an upward decline in MgO (14.6–4.4 wt %) and a small increase in incompatible element abundance (Ce = 35–50 ppm). The granophyre becomes slightly more evolved from the top toward the base (MgO = 0.6–2 wt %; Ce = 90–120 ppm). Some of these variations may be due to differentiation, but we believe that the crystallization of the original melt took place from the base upward and the top downward; this implies that the melt sheet was fundamentally density stratified into noritic and granophyric layers. Estimates of the bulk composition of the melt sheet are within the range of quartz diorite from the different Sudbury offsets, and we believe that all of these rocks are the products of im-pact-triggered melting of upper crustal rocks of the Sudbury region.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".