Formation and extent of the Cretaceous West Mountains plutonic complex
Bibliographic record
Abstract
ABSTRACT The West Mountains plutonic complex is a series of intrusive bodies, presently located in Idaho, that formed during a continuous period of Early to mid-Cretaceous magmatism in the northwest North American Cordillera. Granitoids of the West Mountains plutonic complex were emplaced across the boundary between accreted terranes and Laurentia following the Jurassic accretion of the Blue Mountains Province. New U-Pb zircon crystallization dates from the West Mountains plutonic complex ranging from 130 to 109 Ma and new zircon εHf isotopic compositions ranging from +12.1 to +4.7 suggest the complex is older and compositionally distinct from the younger than 85 Ma peraluminous granites of the Idaho batholith to the east. Instead, metaluminous compositions and the timing of magmatism indicate the West Mountains plutonic complex is similar to the subduction-related intrusions of the Sierra Nevada and northwest Nevada regions. We present a model for the West Mountains plutonic complex as part of the ca. 130–85 Ma subduction-related Idaho arc. Using new data from the West Mountains plutonic complex, we characterize the tectonic history of the subduction-related Idaho arc as separate from the peraluminous parts of the Idaho batholith, which resulted from crustal melting. The existence of the Idaho arc supports models of a longitudinally continuous Early to mid-Cretaceous magmatic arc in the western United States. The Idaho arc, including parts of the West Mountains plutonic complex, experienced significant transpressional deformation and intrusive overprinting, resulting in a diminished spatial footprint relative to other Cretaceous magmatic centers. This deformation and associated exhumation resulted in the Idaho arc being a significant source of detrital zircons in the central North American Cordillera during mid-Cretaceous time.
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 | 0.000 | 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) | 0.002 | 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".