Characteristics and Origin of Rare Earth Mineralization at the Alces Lake Property, Northern Saskatchewan
Bibliographic record
Abstract
Rare earth elements (REEs) are critical metals that are essential to the low-carbon economy, especially the rapidly-growing green energy production and storage industry. REEs have been produced from a great variety of deposit types related to magmatic, metamorphic, hydrothermal, chemical weathering, and sedimentary processes. Massive monazite mineralization at the Alces Lake REE property in the Beaverlodge Domain of the Rae Province of northern Saskatchewan has attracted recent exploration and has been suggested to represent a paleo-placer type deposit, which would imply significant resources; however, this interpretation for the origin of the REE mineralization is questionable. The massive monazite mineralization at the Alces Lake property is situated on the eastern limb of a fault truncated synform fold. This synform fold is likely related to the nearby St. Louis Fault adjacent to an unconformity with Archean aged or Arrowsmith Orogeny-related gneisses and granites on the western limb and younger Paleoproterozoic gneisses and granites alongside the Murmac Bay Group metasedimentary rocks, metavolcanics, and quartzite on the eastern limb (Normand, 2014). The REE showings occur as monazite-biotite-mineralized pegmatites, massive biotite pegmatites, granitic pegmatites, allanite-rich veinlets, and large leucogranite bodies scattered throughout the property. The REE mineralization at the Alces Lake property is primarily in the form of monazite, zircon, and allanite. The elevated REE contents largely correspond to an increase in radioactivity caused by the thorium contents in monazite and allanite. Therefore, radioactivity can be used as an exploration tool to locate REE mineralization. Exceptions to this do occur with some less radioactive pegmatites and leucogranites containing high total REE contents (>1.5 wt.%), whereas some highly radioactive biotite-rich pegmatites have <0.5 wt.% of total REE. Field and petrographic examinations show that the Ivan-Dante Zone has a semi-continuous pegmatite of abundant monazite and zircon with the highest discovered radioactivity and REE mineralization at the Alces Lake property. Monazite-(Ce) is characterized by 5.43-10.54 wt.% ThO2, incorporated largely by the substitution Th4+ + Ca2+ = 2REE3+, while zircon contains 1.03-1.48 wt.% HfO2. U-Pb geochronological analyses yielded an age of 1926±3 Ma for zircon and 1926±15 Ma for monazite, which confirm their crystallization during the Taltson Orogeny. Therefore, the Alces Lake pegmatite-hosted REE mineralization is not a placer, but most likely had a late magmatic-hydrothermal origin related to Taltson-aged leucogranites. The leucogranites most likely formed from anatexis as a result of granulite-facies regional metamorphism during the Taltson Orogeny and were evolved to produce pegmatites and associated hydrothermal veins containing REE mineralization. The fold hinges and faults at Alces Lake provided the conduits for focused emplacement of the REE-mineralized pegmatites and hydrothermal veins.
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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 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".