Intrusion-related (ca. 422 Ma), monzogranite-hosted Au-Ag-Sb mineralization at the Yellow Fox zone, eastern Mount Peyton Intrusive Suite, north-central Newfoundland, Canada
Bibliographic record
Abstract
The northeastern and eastern parts of the ca. 425–416 Ma Mount Peyton Intrusive Suite in north-central Newfoundland, Canada, host several Au-Ag-Sb-bearing mineralized zones associated with fracture systems and narrow quartz veins mantled by wide, potassic (sericite-muscovite) alteration envelopes bearing arsenopyrite and locally pyrite and stibnite. The Yellow Fox zone is hosted in a medium-grained and plagioclase-porphyritic, granophyric-textured biotite ± hornblende I-type transitional to A2-type monzogranite in the northeastern part of the intrusive suite that is cut by rectilinearly fractured, muscovite-arsenopyrite-pyrite-rutile-alteration zones. This alteration occurs in an ~100 m long by 30 m wide, north-trending bleached and rusty alteration zone characterized by three distinct fracture sets: (1) a widely spaced, roughly east-west barren set; (2) a prominent north-trending 5–20 cm spaced set accompanied by abundant muscovite and disseminated arsenopyrite + pyrite; and (3) a weakly-developed, north-northeast-trending set that locally hosts a few narrow (<4 cm) stibnite-quartz-arsenopyrite veins with arsenopyrite mainly confined to the quartz vein margins and intensely altered to supergene scorodite and goethite. Relative to unaltered granite, both muscovite-pyrite-arsenopyrite-rutile-altered monzogranite and stibnite-quartz-arsenopyrite-veined monzogranite are anomalous in many metals (Sb <11.1 wt.%; As < 4.5 wt.%; Au <59.4 g/t; Ag < 73g/t; Pb <5.5 wt.%; Zn <7 wt.%; Cd <717 ppm). The altered host rock yielded a crystallization age of 422.3 ± 1.3 Ma (CA-ID-TIMS U–Pb zircon), overlapping in error with two 40Ar/39Ar incremental-heating ages of 422.4 ± 0.2 Ma and 422.9 ± 0.6 Ma for muscovite from the same altered monzogranite. The coincident ages indicate that monzogranite crystallization and alteration were synchronous and therefore intrusion-related and formed broadly contemporaneously with proximal, mineralogically similar, intrusion-hosted mineralization in the region. Undated Au-Ag-As-Sb mineralization in the adjacent surrounding country rocks may also have been coeval. Fracturing, release of hydrothermal + magmatic fluids from deeper seated intrusions, and mineralization occurred during the final stages of monzogranite crystallization, which is interpreted to be associated with transient lithospheric extension that preceded north- to northwest-directed oblique Acadian thrusting, folding, and proximal orogenic Au mineralization in the Early Devonian (ca. <415 Ma).
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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 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| 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 teacher head, 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".