Field evidence for commingling between ca. 1830 Ma lamprophyric, monzonitic, and monzogranitic magmas, MacQuoid-Gibson lakes area, Nunavut
Bibliographic record
Abstract
Although it has been recognized that ca. 1830 Ma, mantle-derived ultrapotassic and mildly alkaline, granitic crustal melts are broadly coeval in the northwest Hearne domain of the western Churchill Province, details of their petrogenetic relationships remain enigmatic. Field observations from a number of localities demonstrate that a range of magmatic compositions coexisted at that time ranging from spessartite lamprophyre and/or phlogopite clinopyroxenite through hornblende+phlogopite gabbro, diorite, and quartz monzonite to biotite granodiorite and biotite+magnetite±fluorite monzogranite. Mutual crosscutting relationships between many of the rock types, typified by irregularly shaped intrusive bodies having diffuse contacts and, scalloped enclaves of lamprophyre and monzonite in monzogranite imply diverse magma commingling, and that the potassic, mantle-derived melts possibly initiated the widespread, ca. 1830 Ma granite bloom in the 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 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".