Development of an ion microprobe technique for the in situ isotopic analysis of organic carbon - Application of the origin of bitumens associated with uranium deposits in the Athabasca (Canada) and Witwatersrand (South Africa)
Bibliographic record
Abstract
Des mesures de [Delta]13C par sonde ionique ont été effectuées dans des bitumes provenant des gisements d'uranium de l'Athabasca et du Witwatersrand. Les variations de la proportion en groupements aliphatiques ont été mesurées par micro spectroscopie infrarouge à transformée de Fourier. Une corrélation positive est observée entre la teneur en groupements aliphatiques et les valeurs de [Delta]13C détenninées à l'échelle micrométrique pour l'ensemble des bitumes analysés. Les fractionnements isotopiques du carbone observés lors d'expériences de synthèse abiogénique d'hydrocarbures entre le carbone inorganique et les différentes classes de composés produits pourraient expliquer à la fois la gamme des valeurs de [Delta]13C et leur corrélation avec la teneur en groupements aliphatiques. Cette hypothèse semble en accord avec la présence de CO2 et H2 dans la phase gazeuse des inclusions fluides associées aux deux gisements, qui pourraient avoir joué le rôle de réactifs lors de la synthèse des hydrocarbures.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 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) | 0.001 | 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".