Cryogenian Glacial Erosion and Tectonics as Agents of Crustal Recycling
Bibliographic record
Abstract
ABSTRACT Zircon preserves evidence of recycling processes that link surface environments to the mantle. Combined δ 18 O‐εHf in zircon fingerprints magmatic sources and tracks how crustal material is reworked over time. We apply statistical analyses to a global compilation that apparently resolves shifts in zircon U–Pb, δ 18 O, and Lu‐Hf data spanning the Neoproterozoic. Between ~750 and 705 Ma, a decline in crustal residence ages suggests recycling of juvenile crust into subduction zones, overlapping with the onset of the Sturtian glaciation and potentially driven by erosion of Tonian basaltic provinces. After 705 Ma, residence ages increase, marking intensified crustal recycling during the Sturtian and Marinoan glaciations, supported by εHf and δ 18 O change points at ~690 Ma. This transition towards greater incorporation of ancient sediments may reflect tectonic instability during Rodinia's breakup and glacial erosion. These findings suggest a complex interplay between tectonics, climate, and large igneous province processes in shaping Earth's crustal evolution.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".