Conditions de genèse des gisements d'uranium associés aux discordances protérozoïques et localisés dans les socles. Exemple du socle du bassin d'Athabasca (Saskatchewan, Canada)
Bibliographic record
Abstract
New basement-hosted uranium deposits in Athabasca Basin (Saskatchewan, Canada) were recently discovered. This ore type is now a new exploration target. The formation processes of basement-hosted ores are discussed and their discovery is not obvious. To better understand this deposit type, a multidisciplinary study has been focussed on three deposits: Eagle Point, Millennium and P-Patch. The basement-hosted uranium oxides have variable chemical characteristics function of their crystallisation and posterior alteration conditions. U-Pb isotopic ages are in accordance with uranium oxides localized at the unconformity. The same tendency is observed too for Rare Earth Elements (REE) concentrations. Physico-chemical conditions and fluid circulations are thus close to for the two types of deposit. The brines associated to deposit formation circulate in the basement, for a part, thanks to metamorphic structures and microstructures reopenings under the same stress field than those occurring during the late metamorphic episodes. Microfracturing determines directly the alteration degree of the rock and thus the chemistry evolution of the brines. Basement alteration by brines is progressive and favours the successive destabilisation of mineral, permitting the transfer of several elements from the basement to the basin. Basement accessory minerals are altered to totally dissolved, indicating that the basement is a main source of uranium and REE for the mineralization formation. Late meteoric fluids (<300 Ma) destabilized previous uranium oxides and favour the crystallization of uranium redox-front in hydrothermal alteration halo
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".