Pliocene to Late Pleistocene Magmatism in the Aurora Volcanic Field, Nevada and California, USA: A Petrographic, Geochemical, and Isotopic Study
Bibliographic record
Abstract
The Pliocene-Pleistocene Aurora Volcanic Field (AVF) covers 325 km 2 , stretches across the California-Nevada border north of Mono Lake, and overlaps the Miocene Bodie Hills Volcanic Field (BHVF).It lies within the northwest-striking Walker Lane shear zone at the western margin of the Basin and Range province.Although erupted in a postsubduction setting, normalized incompatible element patterns show a continental arc-like signature, similar to those of other late Cenozoic volcanic fields within the Walker Lane, interpreted to reflect a metasomatized lithospheric mantle source.Petrographic features suggest syn-magmatic open system processes.While trace element compositions show few signs of these processes, the range in isotopic ratios confirm them.The BHVF and the AVF rocks have similar Pb isotope ratios, however, the AVF rocks have higher 87 Sr/ 86 Sr, lower 143 Nd/ 144 Nd, and stronger correlations between 87 Sr/ 86 Sr, silica, and 18 O, indicating that crustal assimilation was a more influential process in the AVF than in the BHVF.
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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 | 0.000 |
| 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".