Geology and mineralization of the link between Hope Bay and Elu Greenstone Belts, northeastern Slave Craton, Nunavut
Bibliographic record
Abstract
Located in the NE Bathurst Block of the Slave Craton, the Hope Bay and Elu belts are two Neoarchean greenstone belts striking N-S and NE-SW, respectively. The Elu Belt (EB) southern end is deflected westwards to form a concave connection termed the Elu Link (EL) where 2716 to 2663 Ma supracrustals are in part shared with the adjacent Hope Bay Belt (HBB). The EL supracrustal sequence consists mainly of tholeiitic pillowed metabasalts with lesser amounts of interleaved metadacite, metarhyolite, iron formation, and metashale, having variably recorded D1 - D3 deformation. Supracrustals appear to be seamlessly in contact with syn-D1 migmatite orthogneiss on the EL eastern margin. Orthogneiss and supracrustal rocks were both intruded by syn- to late-D2 metagabbros and metagranites. Like in the HBB, Archean magmatic rocks of the EL originated from deep and upper mantle sources in a probable back-arc setting. Sparse NE-striking Proterozoic dolerite dikes derived from deep mantle sources cut the entire rock mass. D1 deformation was successively accompanied by hydrothermal alteration and prograde metamorphism reaching epidote-amphibolite facies peak conditions, but related structures are strongly obscured by D2 + D3 overprint. D2 that initiated under prograde metamorphism and was further accompanied by greenschist retrogression deformed D1 fabrics around tight to open curvilinear F2 folds forming a foliation triple junction between the EB + HBB. The F2 folds together with L2 radial stretching lineation and coeval shear zones show that the EL is rimmed around a syn-compression large-scale D2 dome. D3 is a brittle-ductile deformation lacking any visible fabric. Both D2 + D3 denote vertical general flattening dominated transpression with E-W maximum compression and N-S minimum extension. They illustrate asymmetric syn-compression exhumation of the HBB and EB that were further affected by strain-free greenschist retrogression due to the Thelon Orogeny. The mineralization comprising Au-As-Cu-Zn metals in most EL rock units occurred prior and, possibly, during metamorphism, was further remobilized by subsequent tectonic and thermal events. It follows that ore mineralization occurrence in the EL is chiefly lithologically and structurally controlled.
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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 | 0.001 |
| 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".