Rare evidence for the existence of a Hadean enriched mantle reservoir
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Bibliographic record
Abstract
Short lived isotopic systems can help unravel the complex early differentiation history of the Earth's mantle.Excesses in neodymium-142 ( 142 Nd) measured in several occurrences of Archean mantle-derived rocks, compared to the modern upper mantle, imply the formation of an early depleted mantle in the Hadean.However, the existence of a complementary enriched reservoir, which should have also stemmed from such early differentiation event, remains equivocal.New data on 3.4 billion year old amphibolites from the São José do Campestre Massif, NE Brazil, show well resolved 142 Nd deficits compared to the modern upper mantle, down to -14.1 ppm.This provides the first clear evidence for an early enriched mantle source, which may represent the missing concomitant reservoir complementary to Earth's early depleted mantle.
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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