Gold mineralisation in a chemically reactive host: the Archean Gold Mineralised Vickers Dioritic Intrusive Complex, Nunavut Canada.
Bibliographic record
Abstract
The Vickers albitised dioritic intrusion (VDI, 2668 ± 6 Ma), located in the central Hearne sub- domain of Nunavut, hosts a significant gold discovery (2012; e.g., hole PB-12-09 164.41 m @ 5.39 ppm Au). The intrusion (equilibrated to lower-greenschist-facies) is located in the northern part of the 2.72 to 2.65 Ga Tavani greenstone belt, an area that has been interpreted to contain the Pistol Bay Corridor, a west-northwest-trending brittle/ductile deformation zone. The VDI is an elliptical (900 x 600 m) heterogeneous igneous intrusion emplaced into the siliclastic Evitaruktuk Formation, part of the sedimentary Kaminak Group, and contains highly anomalous Au mineralisation focused along its northeastern contact. Pyrite and arsenopyrite, spatially associated with gold mineralisation, occur proximal to quartz- carbonate± chlorite veins that increase relative to the severity of hydrothermal alteration. Several gradational alteration assemblages are present in the mineralised zone, including chlorite- (CF1+CF2) and silica-facies (SF1I + SF2I) that are restricted to the VDI, and sericite-facies (SF1FW+SF2FW) in the footwall. By integrating petrographic observations, LA-ICP-MS analysis (sulphide mapping, Pb isotopes), in situ SIMS δ18Oquartz and δ34Spyrite, arsenopyrite, and other geochemical data (whole rock, SEM, etc.), a working model is proposed. The preferred model suggests that a metamorphic fluid carrying Au as a bi-sulphide complex was focused along a rheologically favourable contact and subsequently reacted with the Fe-oxide - rich VDI and precipitated Au via sulphidation reactions.
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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 | 0.003 | 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".