The Northeast Nevada Volcanic Field: Magnetic properties and source implications
Bibliographic record
Abstract
Magnetic susceptibility and remanence studies on late Eocene ash flow deposits of the Northeast Nevada Volcanic Field (NENVF) were undertaken at 39 sites in four sampling localities: Dolly Varden Mountains (20 sites), Nanny Creek area of the Pequop Mountains (11 sites), eastern Windermere Hills (7 sites), and southern Snake Mountains (1 site). These deposits span a narrow age range from 41.08 to 39.08 Ma based on40Ar/39Ar data [ Brooks et al., 1995a , 1995b ] and on new K‐Ar ages presented here. Characteristic remanences reveal that all ignimbrites sampled are reversely magnetized. The characteristic directions of remanent magnetization do not significantly deviate from the expected direction computed from the 42 Ma mean pole for North America, indicating that no major vertical axis rotations have affected the sampling regions since Eocene time. Anisotropy of magnetic susceptibility studies, undertaken to decipher flow trends and possible source areas for these ash flow tuff units of the NENVF, are consistent with a source region near the Toano Range. This places the ash flow source area east of Nanny Creek, the type area for the NENVF. The suspected source region lies close to the Wells fault system. However, Tertiary detachment faulting, Basin and Range normal faulting, erosion, and sedimentation have obscured the suspected source region. A more clearly defined zone of Eocene igneous activity, in the central Pilot Range to the east, cannot be ruled out as a potential source area.
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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 | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 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".