Epidote associated with the porphyry Cu-Mo mineralization at the Gibraltar deposit, south-central British Columbia
Bibliographic record
Abstract
The Gibraltar porphyry-copper molybdenum deposit in the Canadian Cordillera is hosted by the late Triassic, Granite Mountain Batholith (GMB). The batholith is tonalitic and composed of quartz, plagioclase and minor hornblende and biotite in various modality. The rocks in the batholith show phyllic and propylitic alteration. Propylitic alteration (green rock alteration) is characterised by epidote, chlorite, albite, and is extensive throughout the batholith. The name epidote is used in this paper for epidote group minerals which include clinozoisite, epidote (sensu stricto), allanite, ferriepidote and ferriallanite. Epidote occurs as dissemination, isolated grains, and aggregates, and forms mono-minerallic veins and epidote-bearing veins in the batholith. These veins (>2 cm in width) in the batholith generally strike towards the mineralized centre. Epidote enclosed by chalcopyrite or pyrite is compositionally homogeneous and Fe-poor, suggesting that Fe is preferentially incorporated into sulphides and that epidote crystallized together with sulphide minerals. Individual grains of epidote in epidote-bearing veins show compositional zoning with Fe-poor cores and Fe-rich rims. Epidote grains disseminated in the batholith show similar compositional zoning with Fe-poor cores and Fe-rich rims. Allanite and REE-rich epidote are identified in the GMB less than 2 km from mineralization and within the Burgess Creek Stock (10 km from mineralization). Epidote containing 0.01 -1 wt.% REEs is common in grains forming aggregates throughout GMB. Epidote with high REEs (> 1 wt.% REEs) occurs only in rocks with a bulk composition >70 ppm REEs. Compositional zoning of epidote suggests that the hydrothermal history of the GMB comprised of early S-rich hydrothermal activity, followed by S-poor barren hydrothermal activity. Epidote in the Nicola volcanics and Cuisson Lake Unit near the GMB is homogeneous and Fe-rich and commonly contains inclusions of apatite and titanite. The contents of REEs in epidote in the Nicola volcanics are all below the detection limits of SEM (1000 - 5000 ppm) and EPMA (La, 470 ppm; Ce, 380 ppm; Pr, 640 ppm; Nd, 330 ppm).
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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 | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 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".