Bibliographic record
Abstract
Three types of hydrothermal alteration spatially associated with Cu-Zn minerali-zation within the Archean Blake River Group of greenschist facies metavolcanic rocks, Noranda, Quebec, were studied. Alteration was mapped around a partly frag-mental rhyolite dome, enclosed in mafic flows. Sodic regional alteration and calcic-silicic background alterations were overprinted by potassic and magnesian pipe alteration. Pipe alteration was mapped only in conical breccia pipes within the rhyol-ite dome, which terminate at a pyroclastic rhyolite-rhyolite breccia contact. Cu-Zn sulfide mineralization was found within the pipes and in stratiform exhalative tuff on overlying volcanic rock contacts. Mass balance studies suggest a general trend from base-fixing regional and background alteration to base-leaching pipe alteration. Textural and geochemical evidence and similarities with presently active geo-thermal systems indicate alteration and mineralization were products of an Archean convective system, closely related in time and space to volcanism. Albite-rich rocks (regional alteration) are mineralogically similar but chemically distinct from greenschist facies metavolcanic rocks in the rest of the Noranda area. They are chem-ically similar to spilitic rocks from Thingmuli volcano, Iceland, and are the earliest evidence of seawater-rock interaction. This interaction, in conjunction with further reactions during subsequent background alteration, converted neutral to alkaline seawater into a hot, metal-enriched acid brine. Final reactions between this brine and the rocks through which it passed immediately beneath the sea floor resulted in pipe alteration and in Cu-Zn mineralization where the brine was expelled onto the sea floor. Stratiform pillowed andesite flows showing calcic background altera-tion were altered during their deposition by continuing exhalative activity. These distinctive altered flows represent excellent field indicators of base metal mineral-ization, best identified and traced through detailed mapping.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.014 | 0.003 |
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; both teacher heads agree on what is shown here.
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".