Comparative 142Nd and 182W study of MORBs and the 4.5 Gyr evolution of the upper mantle
Why this work is in the frame
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Bibliographic record
Abstract
W standard Nd standard OIB -7 -6 -5 -4 -3 -2 -1 0 1 2 3 142 Nd OIB MORB 0.0 0.2 0.4 0.6 0.8 1.0 Probability density Probability density -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 -10 -9 -8New high precision Nd and W isotopic compositions were obtained on the same basalt samples from the Pacific-Antarctic Ridge.These provide the best estimate so far for the μ 142 Nd and μ 182 W values of the depleted mantle source of mid-ocean ridge basalts known as DMM.The PAR basalts yield a mean μ 142 Nd = -1.6 ± 5.0 (2 s.d.) and μ 182 W = -1.9± 3.5 (2 s.d.), which together with the literature data allow the isotope composition of the DMM to be constrained.The present-day DMM μ 182 W is 10-20 ppm lower than that of the Archean mantle.This decrease could be related to the broad incorporation of mantle plume material into the upper mantle, starting between 2.4 and 3 billion years ago, due to the onset of deep cold slab subduction, and its attendant return mantle flow.
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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 | 0.001 |
| 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