Stratigraphic setting of the LZ5 and Ellison mineralized zones, LaRonde Zone 5 project, Doyon-Bousquet-LaRonde mining camp, Abitibi, Quebec
Bibliographic record
Abstract
The LaRonde Zone 5 (LZ5) project and the neighbouring mineralized zones of the Ellison property are part of the Doyon-Bousquet-LaRonde mining camp in the southern part of the Abitibi greenstone belt. The mineralized zones of the LZ5 (zones 4, 4.1, and 5) and the Ellison property (zones A and B) are hosted in the Bousquet Formation of the Blake River Group. The host rocks are steeply south-dipping (80-90°) and south-facing, mafic to felsic volcanic and volcaniclastic units. The synvolcanic gold mineralization consists of deformed discordant networks of millimetre to centimetre thick pyrite±pyrrhotite±chalcopyrite veinlets (10-20 vol.%) and, to a lesser extent, very finely disseminated pyrite (1 vol.%) in altered volcanic and volcaniclastic rocks. Prior to this study, the LZ5 and Ellison mineralized zones were interpreted to be hosted in the Bousquet heterogeneous unit (Unit 4.4) in the uppermost part of the lower member of the Bousquet Formation. The current study shows that the mineralized zones are located higher in the stratigraphic sequence, i.e., in highly deformed and altered mafic to felsic volcanic and volcaniclastic units (tuff and lapilli tuff) at the base of the upper member of the Bousquet Formation. Consequently, the LZ5 mineralization, which is considered one of the oldest in the camp, coincides in time and space with a shift in the magmatic evolution of the Bousquet Formation from dominantly tholeiitic-transitional mafic-intermediate (lower member) to dominantly transitional-calc-alkaline intermediate-felsic (upper member). The revised position of the LZ5 ore zones to slightly higher in the stratigraphic sequence substantiates the camp-wide association between Au (±Cu-Zn-Ag) mineralization and intermediate to felsic transitional to calc-alkaline magmatism and further indicates that hydrothermal and petrogenetic processes are linked in major synvolcanic Au deposits in the Archean.
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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) | 0.005 | 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".