Northwest Territories ' A Revised Genetic Model
Bibliographic record
Abstract
The unusually large (4.2 million metric tons) and high-grade (1.6 % WO3) Cantung E zone exoskarn scheelite orebody developed in a dolomite-poor, Lower Cambrian marble horizon as a result of infiltration metasomatism shortly following the epizonal intrusion of an Upper Cretaceous, peraluminous, biotite monzogranite pluton. Thermal metamorphism attained the pyroxene-hornfels facies and was accompanied by the formation of minor folds and a foliation parallel to contact in the inner aureole. Subsequently, following a temperature drop of 50 ø to 100øC, initial hydrothermal activity at 450 ø to 500øC generated, essentially simultaneously, a zoned array of anhydrous and hydrous reduced skarn facies (garnet-pyroxene, pyroxene _ pyrrhotite, amphibole _ pyrrhotite, and biotite _ pyrrhotite), probably reflecting steep gradients in the ratio aca.•/az i,,troauc•a.... V...... ts in the fluid. Skarn development thereafter persisted to temperatures as low as 270øC, with the continued development of the richly mineralized hydrous facies, in part through replacement of anhydrous karns, but also through reaction with hitherto unmetasomatized marble as fluid channelways changed. Skarn formation occurred under a confining pressure of ca. I _ 0.3 kb (from sphalerite geobarometry) and was associated with extensive brittle and ductile deformation of the exoskarn contact zone. Scheelite, abundant in all skarn facies except the garnet-pyroxene, is everywhere strongly correlated with pyrrhotite and shows little textural evidence of dissolution in the course of skarn development. It is implied that it was a stable phase throughout he evolution of the zoned skarns, at least in pyrrhotite-forming environments, perhaps reflecting unusually high tungsten contents in the fluid. Deposition of scheelite was probably widely caused by aggregate increases in fluid ac•. • and pH, resulting from the associated and interrelated reactions:
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.075 | 0.016 |
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".