10.1016/s0967-0653(97)88656-5
Bibliographic record
Abstract
In widely accepted models for tle origin of volcanic axcs at convergent plate margins, magmas originate in subductionmodified peridotitic mantle. Primary arc magrnas are predictably unique in ffierent arcs because of the variety of potential components and processes involved in their generation, but they should sharc the common characteristics of high concentrations of Mg, Ni and Cr, reflecting their mantle origin. An examination of suites of samples taken from tbree southwest Pacific volcanic arcs (the Kermadec, New Zealand and Papuan arcs) shows contrasting geochemical pat[erns that correlate with different tectonic settings. Magmas with primitive chemical characteristics are comparatively rare, and appear to occur where an extensional tectonic se6ing has allowed patls ofrelatively rapid ascenl In typical arc settings, magma ponds at one or more positions above its source and is modified by a combination of fractionation, eruption, assimilalion and recharge prccesses, so that the most primitive magma erupted is i chemically evolved high-Al basalt. The factors that dictate the geochemical nature of magnas in volcanic arcs-are tectonic sefling togefher with the environment (depth) at which primary nantle-derived magmas are modifiedKewords: arcs, primary magma, high-Mg basalt, Eu anomaly, southwest Pacific.
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.003 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.002 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.005 | 0.007 |
| Open science | 0.004 | 0.004 |
| Research integrity | 0.007 | 0.003 |
| Insufficient payload (model declined to judge) | 0.991 | 0.993 |
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; the direct Gemma label and the distilled Codex classifier agree on what is shown here.
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".