Late Cretaceous Chemical Remagnetization of the Paleozoic Carbonates from the Undeformed Foreland of the Western Canadian Cordillera
Bibliographic record
Abstract
Abstract Viscous remanent magnetization (VRM) recently acquired in the Earth’s magnetic field provides a compass to recover in-situ orientation of unoriented core material. This method was used to date a late chemical remanent magnetization (CRM) in Paleozoic carbonate rocks (Devonian to Mississippian) from the foreland of the western Canadian Cordillera. The paleomagnetic data showed three distinct components: (1) a low-temperature component, which is commonly removed at temperatures below 180°C and is assumed to be induced by drilling; (2) a medium-temperature component, which is commonly removed below 250–400°C, with a steep normal polarity direction; and (3) a high-temperature component, which is isolated above 250–400°C. In the foothills, high-temperature magnetizations always have steep reverse polarities, whereas in the Interior Plains, both normal and reverse polarities with more scattered inclinations are observed. The agreement between theoretical and laboratory blocking temperatures supports the interpretation that the medium-temperature component has recorded Earth’s magnetic field over the normal polarity Brunhes epoch as a VRM. The same approach for the high-temperature component led to the interpretation that the high unblocking temperatures indicate a CRM event that affected the Paleozoic carbonates long after deposition. This component is equivalent to the A component observed by Enkin et al. (2000)in exposed strata. By correcting declination values using the medium-temperature component, the direction of the high-temperature component in the Interior Plains is D =330.4°, I= 74.3, k =84, α 95= 3.4°, N =22 specimens, and in the foothills, it is D =331.3°, I= 82.4°, k =30, α 95= 8.1° N =12 specimens, corresponding to pole position consistent with the Late Cretaceous section of the North American apparent polar wander path.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".