New U-Pb ages from the Eastern Coast Belt, southern British Columbia; Radiogenic age and isotopic studies: Report 13
Bibliographic record
Abstract
Six new U-Pb ages for southern Coast Belt plutons are presented. A 66.6 ± 1.1 Ma titanite age from the Machmell pluton within the southern Coast shear zone provides a maximum age for motion at that location. In the eastern Waddington thrust belt, the Homathko Peak tonalite, a fault slice within the belt, is 153.4 ± 0.3 Ma; the postkinematic Tiedemann pluton is early Tertiary. In the Mount Raleigh area, a monazite date of 85.0 ± 0.5 Ma provides a minimum age for crystallization and a maximum age for amphibolite-facies metamorphism of the Sisyphus Creek leucogranite. The synkinematic Mount Gilbert pluton crystallized at 83.6 ± 0.2 Ma, indicating that metamorphism and thrusting in the Mount Raleigh pendant occurred at that time. The postkinematic Bishop River pluton intruded at 72.2 ± 0.4 Ma. Similarities between the Mount Raleigh and eastern Waddington areas indicate that they form part of an extensive Late Cretaceous fold-and-thrust belt in the eastern Coast Belt.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.005 | 0.006 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 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".