Diabase dyke swarms in the Lac de Gras area, Northwest Territories, and their significance to kimberlite exploration: initial results
Bibliographic record
Abstract
In the Lac de Gras area, geochemical composition and field relationships characterize five Proterozoic diabase dyke swarms and provide data for the development of a tectonic model of dyke emplacement that has implications for kimberlite exploration. Patterns in dyke characteristics (age, orientation, geochemical composition, paleomagnetism) divide the dykes into populations, whose spatial relationship to known kimberlite pipes is tested using GIS and Bayesian techniques. Three Paleoproterozoic dyke swarms (Malley, MacKay, Lac de Gras), both individually and combined as a single population, have a moderate to strong spatial association with known kimberlite bodies. No apparent spatial asso- ciation exists between younger dyke swarms (Mackenzie and 305° ) and known kimberlite bodies.The oldest dyke sets are subparallel to known faults and/or joint sets. The evaluation of the role of early structures in controlling the orientation of Paleoproterozoic dykes requires a better understanding of the age of these faults.
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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 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".