Continent-scale linearity of kimberlite–carbonatite magmatism, mid-continent North America
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Cretaceous–Tertiary kimberlite–carbonatite magmatism in mid-continent North America extends along a N40°W linear trend from Louisiana to Alberta, and occurs in at least four different pulses (~109–85, 67–64, 55–52, and less than 50 Ma). The lack of spatial age progressions of magmatism consistent with motion of North America over a fixed hot spot, the presence of Sr–Nd–Hf–Pb isotopic and trace-element compositions that show a temporal evolution from lithospheric to asthenospheric melt-sources, and the orientation of the magmatic belt parallel to the western subduction margin of the North American plate, suggest that this linear zone is the surface expression of mantle melting related to the subduction system. We propose that fragmentation of Farallon and Kula plates opened slab windows perpendicular to their convergence direction. In this model, sheet-like mantle upwellings were induced along slab-window margins, and these upwellings underwent low-degree partial melting to produce highly alkalic magmas along the trend parallel to, but ~ 2000 km east of, the convergent margin. The N40°W trend may reflect melting associated with penetration of the mantle transition-zone by the downgoing oceanic plate(s).
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 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) | 0.000 | 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 it