The Targeted Geoscience Initiative 4 contributions to the understanding of volcanogenic massive sulphide deposit genesis and exploration methods development: introduction and preface
Bibliographic record
Abstract
Research on topical aspects of the genesis of, and exploration for, volcanogenic massive sulphide (VMS) deposits was formulated and carried out under the auspices of the Volcanogenic Massive Sulphide Ore System of the Targeted Geoscience Initiative 4 Program. Research activities were focussed on addressing two main themes: 1) development of innovative, new, and unconventional detection and vectoring methodologies for VMS exploration; these studies were conducted at the Izok Lake deposit, Nunavut, and regionally throughout the Bathurst Mining Camp, northern New Brunswick, as well as at numerous VMS deposits and prospects regionally throughout the Slave Province, Nunavut and Northwest Territories; and 2) understand the controls on precious metal (gold, silver) endowment or enrichment in VMS deposits. These studies were conducted at several deposits: Lalor Mine, Manitoba; Lemarchant deposit, Newfoundland; Ming Mine, Newfoundland; and the Lemoine deposit, Quebec. Detection and development of vectoring methods focussed on the application of optical reflectance spectrometry (airborne, ground, laboratory), oxygen isotope geochemistry, laser ablation inductively coupled plasma mass spectrometric analysis of volatile elements, multiple sulphur isotope geochemistry, till geochemistry and indicator minerals, and integration of rock properties and geophysics. Each of these research activities produced results that influence exploration strategies for VMS deposits in Canada and elsewhere. Studies focussed on determining the controls on precious metal endowment or enrichment in VMS deposits employed geology, volcanology/volcanic architectural analysis, lithogeochemistry, chemostratigraphy, geodynamic setting analysis, geochronology, hydrothermal alteration systematics, petrography, mineralogy and mineral chemistry (mineralization, alteration, host rock), oxygen isotope geochemistry, sulphur isotope geochemistry, lead isotope geochemistry, and metallogenic considerations. Collectively these studies demonstrate that in all cases, gold enrichment was primary (not late/secondary; i.e., seafloor and aerial weathering, overprinted unrelated mineralizing systems) and was the result of one or more of the following processes: 1) magmatic input, as evidenced by the presence of complex mineral assemblages that include sulphosalts and native elements, anomalous trace element signatures (e.g. epithermal suite: Au-As-Sb-Ag- Hg; felsic magma-associated: Bi-W-Te-In-Sn); and 2) boiling in a shallow-water setting. Only minimal remobilization of gold occurred in deposits in response to greenschist- and amphibolite-facies metamorphism.
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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 | 0.003 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.008 | 0.002 |
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".