U-Pb baddeleyite age for the Paleoproterozoic Lac Esprit dyke swarm, James Bay region, Quebec; Radiogenic age and isotopic studies: Report 14
Bibliographic record
Abstract
Geological mapping east of James Bay has revealed abundant, newly recognized north- to northwest- and northeast-trending Proterozoic diabase dykes in a part of the eastern Superior Province where information was previously scant. A magmatic crystallization age of 2069 ± 1 Ma (U-Pb, baddeleyite) was reported for a representative of the north- to northwest-trending Lac Esprit swarm, distinguishing it from similar- trending but older Matachewan and Mistassini dykes of the region. The Lac Esprit dykes represent an extensive diabase swarm with a Paleoproterozoic age so far unrecognized elsewhere in the eastern Superior Province. The age, together with published preliminary paleomagnetic results, invites comparisons with a postulated, regionally extensive, radiating swarm north of Lake Superior (Fort Frances and reversely magnetized Marathon dykes), among others. The new dyke age contributes information to dyke swarm correlations in the Superior Craton and also aids in the assessment of models promoting apparent polar wander and continental drift of Laurentia during the Paleoproterozoic, or block rotation since this time.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".