Lithological and structural contexts of the sonny zinc showing in the meta-sedimentary belt of the Grenville Province in western Québec
Bibliographic record
Abstract
The Grenville Province is known for its zinc deposits, but significant examples, suchas Balmat-Edwards (NY), are rare and exploration models are nonetheless based onthe characteristics of such large occurrences. This study presents a recent zinc dis-covery and its lithological and structural contexts, with the aim of refiningfavourable environments to such mineralization in the Grenville Province. Discov-ered in 2014, the Sonny zinc showing is located at Ile-du-Grand-Calumet in Québec,100 km to the NW of Ottawa, within Mesoproterozoic marble units of theGrenville Metasedimentary Belt. A detailed map was completed on the southernportion of Ile-du-Grand-Calumet to characterize host rock stratigraphy, and to con-strain the roles of deformation and metamorphism on zinc distribution. The strati-graphic sequence is composed of meta-volcanic mafic rocks (1.232 Ga, U–Pb onzircon), garnet-biotite-sillimanite paragneiss, quartzofelsdpathic schist and dolomiticto calcitic marbles containing minor calc-silicate units and highly recrystallized chert.The metavolcanic rocks developed hornblende-clinopyroxene assemblages, withlocal orthopyroxene and quartz, indicating metamorphism varying from amphiboliteto granulite facies. The marble and associated mineralized layer are deformed andhighly recrystallized. As such, primary structures are rarely preserved within thesequence, making a determination of polarity difficult. The mineralization is strati-form and composed of sphalerite ± pyrite in centimetric layers. It is found exclu-sively in the marble, with a thickness of up to five metres, at 3.8% Zn. The miner-alized layer is also associated with an anhydrite-bearing layer within the marble,demonstrating an oxidizing shallow environment in arid conditions. At least threephases of ductile deformation are documented. The first one is characterized by iso-clinal E-dipping folds (F1). The second phase of deformation is characterized by E-plunging isoclinal folds (F2). This D2 phase explains the variation in the orientationof the S1 foliation in the northern portion of the mapped area. A complex hook-shaped interference pattern (Type III) results from the sum of these phases and thefolds show an important thickening within their hinge zones. The third phase offolding is represented by open E-W trending folds. This structural model makes itpossible to target prospective Zn zones at the scale of Ile-du-Grand-Calumet. Com-bined with geochronological and thermobarometric studies, it will contribute to therefinement of the geological models in this portion of the Grenville. In addition, theidentification of anhydrite-bearing and chert marker horizons provides metallotectsthat define a favourable environment for zinc mineralization.
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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 | 0.002 | 0.002 |
| 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) | 0.004 | 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".