From plant roots to mountain roots: Impact of land plants on arc magmatism
Bibliographic record
Abstract
Abstract The hypothesis that the evolution of land plants influenced arc magmatism offers a compelling link between Earth's biological evolution and plate tectonics. Land plants transformed terrestrial environments, increasing fluvial sediment residence times, intensifying chemical weathering, and increasing clay production. Incorporating muddier alluvial protolith into magmas resulted in a systematic increase in the strength of correlation between δ18O, which reflects the degree of surface weathering, and εHf, which indicates the age of the source material. The emergence of this εHf/δ18O correlation at ca. 450 Ma coincides with the expansion of land plants across a broad latitudinal range, from low to high latitudes. However, the extent to which this isotopic signal represents a global phenomenon, rather than a bias introduced by uneven geographic sampling of detrital zircon, has been questioned. We demonstrate that this shift in correlation persists within single long-lived magmatic provinces, supporting the hypothesis that the isotopic shift reflects a fundamental irreversible change in sediments assimilated into magmatic systems. This isotopic shift occurs in arc systems at various paleolatitudes, indicating no detectable dependence on latitudinally controlled climatic or biologic processes. Therefore, the post–450 Ma shift in arc magma composition remains a key indicator of changing Earth surface processes during the mid-Paleozoic.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".