Detrital zircon U-Pb geochronology and Hf isotope geochemistry of the Laberge Group: synorogenic siliciclastic record of early Mesozoic crustal thickening and tectonic evolution of the Whitehorse trough in the northern Canadian Cordillera
Bibliographic record
Abstract
The Laberge Group consists of synorogenic, marginal-marine to deep-marine strata that were deposited in the Whitehorse trough of central Yukon during the collision of the northern Intermontane terranes along the western Laurentian margin. New detrital zircon U-Pb-Hf data from Laberge Group rock units constrain the Early to Middle Jurassic depositional ages and provenance of Whitehorse trough strata and determine their relationship to the unroofing history of adjacent basement successions. The Whitehorse trough initiated in the Sinemurian as a long, narrow basin that subsequently grew to the west, east, and south by Aalenian time and was sourced by Paleozoic Yukon- Tanana and Stikinia basement rocks and their synorogenic Late Triassic-Early Jurassic plutonic suites. Late Triassic-Middle Jurassic detrital zircon grains from the northern apex of the Whitehorse trough record an excursion to subchondritic Hf(t) values that coincides with the burial of Intermontane terranes and may record crustal thickening proximal to northern regions of the basin.
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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".