Structural controls and relative timing of gold mineralization of the banded iron formation-associated Tiriganiaq deposit, Meliadine district, Rankin Inlet greenstone belt, Nunavut
Bibliographic record
Abstract
The Meliadine gold district is hosted within the Archean (ca. 2660 Ma) polydeformed Rankin Inlet greenstone belt, Nunavut. The district comprises numerous gold deposits and prospects that are spatially associated with the Pyke Fault and its splays. This includes the currently producing Tiriganiaq deposit, which is hosted within the turbidite-dominated structural hanging wall of the Lower Fault, a west-trending splay of the Pyke Fault. The 1150 and 1250 'lode series' within the Tiriganiaq deposit are a series of ore zones with complex geometries. Before underground development, the knowledge of gold-grade distribution in these zones was based on surface drilling results and could therefore not take into account some of the small-scale structural features that control ore grade and ore zone geometry (e.g. <25 m wavelength folding). New field relationships document the importance of horizontal to shallowly south-dipping ore-bearing extensional quartz±ankerite veins. These veins are associated with sulphide replacement zones that are preferentially developed in tightly folded banded iron formation (BIF) intervals. Folding and veining are associated with the main phase of deformation in the deposit area, which corresponds to the second phase (D2) of regional deformation. The D2 deformation at the Tiriganiaq deposit can be further subdivided into two main protracted phases: the first phase (D2A), which is associated with northeast-southwest-oriented shortening and F2A folding; and the second phase (D2B), which is associated with north-south shortening, further folding (F2B), and reverse shearing and veining (shallowly south-dipping extension veins and moderately north-dipping shear veins). The 1150 and 1250 lodes provide an excellent example of the complex geometry of the ore-bearing veins found within the shallowly west-plunging F2B folded BIF successions. These zones provide some of the highest gold grades within the Tiriganiaq deposit and thus highlight the importance of fold hinges and their effect on the generation of favourable traps (thickened BIF intervals), the development of narrow shears (along the limbs), and the development of associated extensional veins in the competent BIF layers, forming structurally and lithologically controlled high-grade zones.
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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 | 0.001 |
| 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 | 0.001 | 0.001 |
| 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".