Paleomagnetism of Dubawnt Supergroup, Baker Lake Basin, Nunavut, Canada: Refining Laurentia's Paleoproterozoic apparent polar wander path
Bibliographic record
Abstract
Shortly after amalgamation of Archean cratons in Laurentia, ca. 1.9-1.8 Ga, its global paleogeographic position and sense of plate motion remains uncertain. Critical review of existing paleomagnetic data through this interval demonstrates that only a few results pass stringent reliability filters as "key poles." New paleomagnetic sampling from Dubawnt Supergroup throughout Baker Lake Basin, Nunavut, Canada, spans ∼1.84-1.68 Ga, including Baker Lake Group, Wharton Group, and Barrensland Group (Thelon Formation) with specific attention to precisely dated units. These ∼1200 samples provide seven new poles and several additional new virtual geomagnetic poles for Laurentia during that interval. Positive conglomerate tests and a positive baked-contact test establish five of these new results as primary, while numerous other field tests constrain the history and pattern of partial remagnetizing overprints throughout Baker Lake Basin, and indicate promising directions for future research. The apparent polar wander path for Laurentia at 1840-1675 Ma, as defined by the new results of this thesis, supports previously published low-latitude poles and suggests a change in direction of motion for Laurentia ca. 1810 Ma, during waning stages of the Hudsonian orogeny. These results permit intriguing paleogeographic connections with other late Paleoproterozoic cratons such as Australia, Baltica, and North China.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.009 | 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".