Bibliographic record
Abstract
Orogenic gold deposits in the Superior Province are characteristically hosted in Archean greenstone belts and are fundamentally controlled by their structural environment.The majority of these deposits are recognized as syn-tectonic with the formation of the Superior Province between 2.8-2.6 Ga and are strongly controlled by east-west-striking shear zones.The Island Gold deposit, hosted in the Goudreau Lake Deformation Zone of the Michipicoten greenstone belt, is consistent with this genetic model.Gold deposits occurring in transverse faults at a high angle to these major shear zones have been observed but overlooked in exploration frameworks in the past and as such, the genesis and timing of these deposits are poorly understood.The Maskinonge Lake fault, a late northwest-trending brittle-ductile structure east of the Island Gold deposit, is one of these transverse structures and is populated with zones of high-grade mineralization along its strike.The historic Pine-Breccia gold showing along this fault encompasses 2750-2700 Ma metavolcanic rocks that have undergone pervasive silica alteration.This silicification is structurally associated with the fault and hosts the majority of gold mineralization, suggesting that the Maskinonge Lake fault was a potential conduit for gold-bearing hydrothermal fluids.Results of detailed outcrop-scale mapping and structural analyses have led to the recognition of two distinct stages of deformation with opposing sense of shear along a steeply dipping fault plane in a dominantly strike-slip regime.Sinistral movement is documented predominantly by the substantial displacement of stratigraphy and vein array analysis whereas dextral motion is identified by the rotation and ductile drag of felsic dykes and regional ENE-striking shear zones towards a NNW-SSE orientation.The coincidence of fluid infiltration with these events coupled with constraints on mineralization provide more insights into the significance of these structures on a local scale, and the results of this study may be used to aid in future exploration around similar structures that are at a high angle to major east-west shear zones in the Superior Province.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.507 | 0.260 |
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".