Le Champ magnétique au Précambrien : applications à l'étude de l'intensité du champ et des glaciations néoprotéozoïques
Bibliographic record
Abstract
L'obtention de nouvelles donnees d'intensite du champ magnetique, a partir d'echantillons de dykes canadiens d'âge compris entre 1000 et 2400 Ma, ont permis, pour cette periode, de doubler la base de donnees existante et d'indiquer un champ de faible intensite. Analyses dans le cadre de la base de donnees totale de paleointensite, ces resultats suggerent une evolution de l'intensite du dipole geomagnetique au cours du temps. Les resultats paleomagnetiques et isotopiques montrent que, pendant la glaciation marinoenne vers ca. 600 Ma, des depots glaciaires de Chine du Sud s'etaient formes a une paleolatitude equatoriale comme ceux d'Australie. Ils rnforcent ainsi l'hypothese de l'existence de glaciations globales pendant lesquelles la Terre est totalement englacee. La combinaison d'etudes isotopiques et paleomagnetiques s'est revelee etre un outil original et puissant tant pour les correlations stratigraphiques que pour la caracterisation de reaimantations
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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 | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".