Preliminary observations on the Inukshuk Ni-Cu-(PGE) deposit hosted within the Expo subsuite of the Lac Esker suite, Cape Smith belt, Nunavik, Québec
Bibliographic record
Abstract
The Inukshuk Ni-Cu-(PGE) deposit is one of numerous magmatic sulphide deposits hosted within the ca. 1882 Ma Expo ultramafic-mafic subsuite of the Lac Esker suite, Cape Smith belt, northern Québec (Nunavik). Discovered by Canadian Royalties in 2021, Inukshuk occurs along an E-W trending intrusive dyke system that also includes the Expo and the Méquillon deposits. The host intrusion is a km-scale, blade-shaped intrusive body that penetrates a sediment-rich horizon of middle Beauparlant Formation (of the ca. 1998 Ma Povungnituk Group) and terminates downward against basalts of the lower Beauparlant Formation and locally against the post-mineral Inukshuk fault. Inukshuk was affected by two phases of deformation: D1, which is responsible for offsets associated with south-verging F1 thrust faults (such as the Inukshuk fault); and D2, which folds these thrusts and produces a NW plunging, open, upright fold system expressed as an antiform at the deposit. The internal lithological facies reveal a progressive transition from a marginal gabbro at the contacts, to a pyroxenite, to a peridotite in the core. The peridotite exhibits poikilitic textures, showing variable degrees of serpentine-talc-tremolite alteration, with gradational contacts between the major lithological facies defined by modal shifts in plagioclase, pyroxene, and olivine. Later cm to m-thick dykes of biotite-gabbro crosscut most lithological facies. Mineralization consists largely of disseminated sulphides but other facies are also observed, including massive, semi-massive, nettextured, stringer, and blebby sulphides. Sulphide mineralogy is typical of orthomagmatic assemblages, consisting of variable proportions of pyrrhotite, pentlandite, and chalcopyrite. All facies are variably overprinted by deformation-induced foliation; stretched pentlandite "eyes" within a foliation defined by chalcopyrite and pyrrhotite commonly characterize massive sulphides. New observations highlight the primary orthomagmatic nature of the sulphide ores at Inukshuk (e.g. loop textures); however, Inukshuk also displays abundant evidence for subsequent sulphide mobilization that locally obliterates primary sulphide textures.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.004 | 0.001 |
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".