Sulphide clast-bearing felsic volcaniclastic units of the Rouyn-Pelletier Formation: comparison with similar units of the Horne Block, Rouyn-Noranda, Abitibi greenstone belt, Quebec
Bibliographic record
Abstract
Sulphide clast-bearing volcaniclastic units are a key exploration vector towards volcanogenic massive sulphide deposits. These marker units are commonly associated with base and precious metal-rich volcanogenic massive sulphide deposits of the Archean Abitibi greenstone belt. One such sulphide (pyrite ±sphalerite-chalcopyrite) clast-bearing felsic volcaniclastic unit is present in the uppermost part of the Rouyn-Pelletier Formation of the Blake River Group in Rouyn-Noranda. The Rouyn-Pelletier Formation is in faulted contact (Andesite fault) with the rocks of the Horne Formation, which are of the same age and style, are sulphide clast-bearing, and host to the giant Horne Au-rich volcanogenic massive sulphide deposit. This raises the question of a possible stratigraphic correlation between the Rouyn-Pelletier (upper part) and Horne formations, with the potential for major implications for exploration in the Rouyn-Pelletier Formation. The study area is composed of broadly coeval extrusive felsic facies with mafic to intermediate extrusive and intrusive facies. Felsic units range from flows with lobate, flow banding and in situ brecciated textures to dominantly sulphide clast-bearing volcaniclastic units with tuff breccia, lapilli tuff and lesser tuff facies. Rocks of the upper portion of the Rouyn-Pelletier Formation and the Horne Block are of similar age and show similarities in volcanic facies. However, there are subtle but significant geochemical differences that suggest that it may not be possible to directly correlate their stratigraphy. The uppermost Rouyn-Pelletier Formation could represent a distal, poorly mineralized equivalent to the Horne West or Horne 5 zones, or it could be an unrelated succession.
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 | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".