<sup>40</sup>Ar/<sup>39</sup>Ar dates on hornblende, muscovite, and biotite from the Mica Creek area, British Columbia: regional metamorphic and tectonic implications
Bibliographic record
Abstract
A metamorphic high, the SelkirkMonasheeCariboo complex (SMC) is a 200 km × 60 km area cored by K-feldsparsillimanite rocks. In the Mica Creek area, there appear to be no discontinuities in metamorphic isograds, structural trends, or the Late Precambrian stratigraphic units. UPb dates suggested that the continuities may only be apparent. In this paper, we report 40Ar/39Ar dates on muscovite, biotite, and hornblende from some of the same samples dated by UPb and samples that crop out very close to the dated samples. The goal was to set constraints on the alternative interpretations of the metamorphicstructural history. These interpretations are as follows: (1) UPb ages record different times of metamorphic crystallization and deformation, and there are significant tectonic displacements; the mappable continuities are only apparent. (2) The structural and stratigraphic continuity is real, and the range is due to localized heating and deformation events spanning ~100 Ma; the relative uniformity of the 40Ar/39Ar dates over a distance of ~45 km suggests that the area behaved as a coherent cooling unit.
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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 | 0.003 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.006 | 0.001 |
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".