Cross-strike potential-field anomalies in the Canadian Cordillera
Bibliographic record
Abstract
Application of bandpass and directional filtering to potential-field maps of western Canada has led to the discovery of regionally extensive anomalies crossing the northwest strike of Cordilleran structures. The most prominent of these, the SteamboatFraser trend, is a northsouth-striking feature that projects from the foreland belt in northeastern British Columbia, where it becomes subparallel to anomalies east of the Mackenzie Mountains, southward to the northern limit of the Fraser River strike-slip fault, a distance of about 600 km. Within the hinterland of the Cordillera, the trend appears to spatially correlate with the margins of some Tertiary volcanics. The northeasternmost, and thus most cratonward, Tertiary volcanics are located on the northern projection of the trend. The trend may thus be interpreted as either late, post-orogenic intrusives (e.g., dikes and related volcanic rocks) that are only partially exposed, as pre-orogenic (pre-Mesozoic) features (e.g., faults, dikes) in the crust that were overridden by the Cordilleran thrust sheets, or a combination of these. Although it is not possible to determine which of these (pre- or post-orogenic) is appropriate for the trend, the eventual choice has important implications for the structure and evolution of this part of the Cordillera. If the source of the anomalies is pre-orogenic, a major implication is that Precambrian Shield rocks would be present at depth beneath the southern Canadian Cordillera as far west as the Fraser River fault. Alternatively, if the source is post-orogenic, it represents an anomalously linear feature that has no obvious expression on the surface other than a poorly defined spatial correlation with the margins of some Tertiary volcanics.
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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 | 0.002 | 0.003 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| 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".