Structural analysis of the Velardeña mining district, Mexico: a faulted Au–Ag-rich hydrothermal system
Bibliographic record
Abstract
Epithermal Au–Ag veins of the Velardeña mining district (north-central Mexico) correspond to narrow, fault-controlled, high-grade structures that are continuous along strike for several kilometres. The veins converge toward the Guardarraya intrusion where carbonate-hosted deposits are found at the contact with surrounding limestones. The mineralized structures are cut by Basin and Range normal faults showing apparent vertical displacement up to 320 m. Paleostress reconstructions in the Velardeña mining district suggest that mineralized structures formed during a NNE-directed extensional event that predated the Basin and Range faulting event (ENE-directed). Basin and Range normal faulting is responsible for surface exposures of various Au–Ag mineralizations formed at different crustal depths, thus enabling studies of the entire hydrothermal system—from low-grade breccia zones in the volcanic cover rocks to deeper base-metal-rich deposits.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 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) | 0.001 | 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".