Petrophysical constraints on magnetic anomalies associated with metamorphic reactions in northern Saskatchewan, Canada
Bibliographic record
Abstract
The western Chipman domain of the east Athabasca mylonite triangle in northern Saskatchewan, Canada, displays a large positive aeromagnetic anomaly that is the result of retrograde magnetite production during exhumation. Petrologic, magnetic coercivity, and hysteresis analyses indicate that multidomain magnetite is the primary magnetic phase in rocks of the region. Measurements of magnetic susceptibility from the western Chipman domain document five orders of magnitude variation, while rocks from the eastern Chipman domain are paramagnetic. The distribution of Koenigsberger ratios is approximately a mixed bimodal lognormal distribution with peak ratios at 0.039 and 0.73, suggesting that magnetic susceptibility is more significant than remanent magnetization. However, remanent magnetization is an important contributor to total magnetization. Petrographic observations indicate that magnetite is primarily produced from the breakdown of hornblende. The consumption of hornblende is also texturally associated with the production of actinolite and the hydration-related breakdown of granulite facies mineral phases such as garnet and clinopyroxene. Based on the proximity of the positive aeromagnetic anomaly to the Cora Lake shear zone, late-stage deformation along the shear zone during exhumation of the east Athabasca mylonite triangle may have structurally controlled the infiltration of fluids resulting in the heterogeneous production of magnetite. These results document the utility of integrating aeromagnetic, petrologic, and rock magnetic data to transcend observational scales and better understand regional tectonometamorphic history.
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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 | 0.005 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".