MASSIVE-SULFIDE DEPOSIT, BATHURST CAMP, NEW BRUNSWICK: CONSTRAINTS ON P–T EVOLUTION
Bibliographic record
Abstract
Sphalerite and arsenopyrite from a transposed and recrystallized feeder stockwork to the Brunswick No. 12 massive-sulfide deposit, in the Bathurst camp of northern New Brunswick, are typically associated with an assemblage of pyrite, pyrrhotite, chalcopyrite, quartz, and Fe-rich chlorite. Textural and compositional analyses of sphalerite and arsenopyrite enclosed in metamorphic pyrite coexisting with pyrrhotite indicate a significant variation in syngenetic through to early D1/M1 pressures and temperatures. The XFeS of sphalerite, ranging between 11.4 and 15.2 mole %, is consistent with pressures of 770 to 440 MPa, which is interpreted as peak to late-D1 pressure, respectively. The local preservation of skeletal arsenopyrite–pyrite intergrowths, discrete zoning in some arsenopyrite crystals, together with a high As:S ratio (31.5 to 33.9 atom % As; 375–475°C), and high Co (0.5 to 10 atom %) and Ni (0.1 to 1.4 atom %) in the intermediate to core zone of many arsenopyrite crystals, could reflect subseafloor epigenetic conditions. Recrystallization during metamorphism yields a lower As:S ratio (29 to nearly 32 atom % As; <425°C) and usually lower Ni and Co contents in arsenopyrite. The compositional variation in sphalerite and arsenopyrite is consistent with evidence of varying degrees of textural preservation and local compositional re-equilibration during a complex P– T metamorphic evolution.
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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) | 0.003 | 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".