Paragenesis and Composition of Tourmaline Types Along the P2 Fault and Mcarthur River Uranium Deposit, Athabasca Basin, Canada
Bibliographic record
Abstract
Abstract The P2 fault, a 13 km-long steeply dipping reverse fault, is the main structural control of the McArthur River uranium deposit in the eastern Athabasca Basin, northern Saskatchewan, Canada. Three types of tourmaline were observed in the metasedimentary basement rocks along the P2 fault: early oxy-schorl [(Na 0.47 □ 0.37 Ca 0.16 )(Fe 2+ 1.30 Al 0.91 Mg 0.72 Ti 0.07 )Al 6 (Si 5.79 Al 0.21 O 18 )(BO 3 ) 3 OH 3 (O 0.63 OH 0.29 F 0.08 ), where □ = vacancy] of metamorphic-anatectic origin, hydrothermal oxy-dravite [(Na 0.57 Ca 0.23 □ 0.18 K 0.02 )(Mg 1.93 Fe 2+ 0.62 Al 0.29 Ti 0.15 )Al 6 (Si 5.93 Al 0.07 O 18 )(BO 3 ) 3 OH 3 (O 0.57 OH 0.23 F 0.20 )], and magnesio-foitite [(□ 0.77 Na 0.20 Ca 0.02 K 0.01 )(Mg 1.99 Al 0.92 Fe 3+ 0.07 )Al 6 (Si 6 O 18 )(BO 3 ) 3 (OH 3 )(OH 0.71 O 0.25 F 0.04 )]. Oxy-schorl formed in granitic pegmatites, a partial melt product of the metasediments during peak metamorphism. Oxy-dravite formed from hydrothermal fluids after the peak metamorphism but before deposition of the Athabasca sandstones, whereas magnesio-foitite is a product of later, low-temperature hydrothermal activity. Both oxy-schorl and oxy-dravite are coarse-grained (from 500 μm up to 1 cm), whereas magnesio-foitite occurs as radial aggregates of fine, prismatic crystals ( apfu ) and high Al at its Y-site (0.70–1.12 apfu ), suggesting that magnesio-foitite likely replaced pre-existing high-Al phases, such as kaolin and sudoite. The occurrence of magnesio-foitite along the entire P2 fault, in both areas of mineralization and apparently barren areas, suggests chemically similar fluids travelled along the entire P2 fault, but only produced ore in localized areas.
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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 | 0.003 | 0.002 |
| Science and technology studies | 0.001 | 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) | 0.002 | 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".