GRANITE FALLS STOCK AND THE HANSEN LAKE RHYOLITE—A HISTORY OF SYN-TECTONIC EOCENE MAGMATISM AND UPLIFT IN THE PILCHUCK RIVER VALLEY DURING REGIONAL TRANSTENSION, SNOHOMISH COUNTY, WASHINGTON
Bibliographic record
Abstract
Our new mapping, U-Pb zircon dating, geochemistry, and isotope information shows that ~43-50 Ma igneous bodies in the Pilchuck Valley preserve a history of Eocene syn-tectonic intrusion and uplift during regional transtension.The Bald Mountain Pluton (BMP), Mount Pilchuck Stock (MPS), and Granite Falls Stock are mesozonal to epizonal intrusions in the Pilchuck River valley whose emplacement was controlled by bounding faults (Fig 1).The ~43 Ma Granite Falls rhyolite exposed directly south of Granite Falls (Fig. 2 and full quadrangle map to the right of this poster) is an extrusive equivalent of the metaluminous ~44-45 Ma Granite Falls Stock.The Hansen Lake rhyolite and S-type BMP and MPS constitute a slightly older ~49 Ma comagmatic package preserved to the east in the upper Pilchuck River valley (Fig. 1).The contact complex bordering the Granite Falls Stock main phase consists of intermediate to felsic aphanitic to porphyritic dikes, and mafic to intermediate, medium-grained intrusive bodies (Figs.345).Early dikes are contact metamorphosed by later intrusions.
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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 | 0.000 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".