Volcanic and tectonic history of mafic volcanic rocks in the Winter Lake greenstone belt, Slave craton, Northwest Territories
Bibliographic record
Abstract
The Archean Winter Lake greenstone belt (WLB) is located in the western part of the Slave craton, ~250 km north-northeast of Yellowknife, Northwest Territories, Canada. Volcanic rocks of the WLB comprise calc-alkaline and tholeiitic basalts with komatiitic flows and associated volcaniclastic rocks contained in the ca. 2.7-2.6 Ga Snare and Credit formations, as well as felsic to intermediate volcanic rocks of the older Newbigging Formation. Archean volcanic sequences of the Slave craton in the Northwest Territories are highly prospective for base metal mineralization, as several are known to host volcanogenic massive sulfide (VMS) deposits. This MSc research elucidates the depositional and tectonic history of volcanic rocks that host massive sulfide mineralization in the WLB. Bedrock mapping (1: 2000 scale) of the mafic volcanic rocks of the WLB for this study took place in four different locations: 1) the south end of Sherpa Lake, 2) the south end of Big Bear Lake, and 3) at the 152 massive sulfide showing 20 km south of Big Bear Lake, and 4) the south end of Newbigging Lake. Lithofacies observed in the eastern WLB at Sherpa and Newbigging lakes include rhyolite domes with autoclastic breccias and highly sheared pillow basalts and mafic volcaniclastic rocks, though both areas are dominated by gabbroic intrusions. In the western WLB, lithofacies observed south of Big Bear Lake include massive and pillowed tholeiitic basalt flows with syn-volcanic mafic dykes and sills, thin komatiitic flows, ultramafic intrusions, and thick ash and lapilli tuff beds locally interbedded with calcareous sedimentary layers. Previous structural interpretations of the WLB have suggested a broadly synclinal architecture, but the proposed east and west limbs are difficult to correlate in terms of lithofacies. Trace element geochemistry of these units is consistent with a plume initiated evolving rift on a continental margin.
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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 | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".