Physical volcanology, lithogeochemistry, petrology, and tectonic setting of the Neoarchean volcanic rocks in the Sunset Lake area, Beaulieu River volcanic belt, Sunset Lake, Northwest Territories, Canada
Bibliographic record
Abstract
Neoarchean volcanic rocks of the Beaulieu River volcanic belt (ca. 2.6 Ga) are found in the Sunset Lake area, located approximately 110 km east-northeast of Yellowknife, NT. Volcanic rocks within the Beaulieu River volcanic belt are dominantly composed of tholeiitic basalts, calc alkaline basaltic andesites, and minor amounts of calc-alkaline rhyolites. The Beaulieu River volcanic belt structurally overlies the ca. 2.9 Ga Sleepy Dragon complex and are conformably overlain by turbidites of the Burwash Formation. The aim of this study is to identify the relative age and stratigraphic relationship between the stratigraphy of the rhyolite dome in south Sunset Lake area and the felsic rocks that host the Sunrise volcanogenic massive sulfide (VMS) deposit 6 km to the north. The volcanic rocks of the southern portion of Sunset Lake area are more complex than originally mapped at a 1:50,000 scale by Lambert (1988). They are volumetrically dominated by lavas; however, the stratigraphy contains a significant (~ 15‒20 vol.%) amount of volcaniclastic rocks, which are interpreted to have been deposited by debris flows and eruption fed density currents in a submarine environment. This study shows that the volcanic succession consists of massive and pillow andesite to basalt, mafic tuff to tuff breccia, and lesser amounts of massive to in-situ brecciated, weakly quartz-feldspar phyric rhyolite, heterolithic felsic tuff to lapilli-tuff, and felsic tuff to tuff breccia. The lavas range from tholeiitic to calc-alkaline affinities and share similar trace element signatures to that of a typical modern arc. While the rhyolite dome in south Sunset Lake area does not show significant mineralization, there are similarities in lithologies, lithofacies, lithogeochemistry, and stratigraphy to that of the stratigraphy that hosts the Sunrise deposit. The study will provide a better understanding of the stratigraphy, volcanic and tectonic settings of the volcanic rocks in the Sunset Lake area, thereby also allowing for a better understanding of the process that formed Archean volcanic belts within the Slave craton that may contain VMS style mineralization.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 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) | 0.001 | 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".