Archean geodynamics and plate tectonics linked to Pb isotope variability
Bibliographic record
Abstract
Abstract Understanding Earth’s early crustal architecture is critical to reconstructing the planet’s geodynamic evolution. We present a global analysis of ~25,000 Pb isotope analyses from ore deposits, focusing on Archean cratons to investigate lithospheric evolution and continental configurations. Spatial patterns in model age and source µ (238U/204Pb) reveal isotopic domains that align with proposed Archean supercratons. Low µ values are characteristic of cratons interpreted to belong to the ca. 2.6 Ga Superia supercraton (e.g., Superior [Canada], Kaapvaal [southern Africa], and Hearne [Canada] cratons), whereas moderate to high µ values are typical of cratons associated with the contemporaneous Sclavia supercraton (e.g., Slave [Canada], Yilgarn [Australia], Dharwar [India], and Zimbabwe [southern Africa] cratons). These long-lived terrane-scale signatures suggest Pb isotopes can resolve lithospheric domains preserved across multiple cratons. Our results offer new geochemical constraints on Archean continental assembly and highlight the utility of ore-deposit Pb isotope data for testing early Earth plate configurations.
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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 | 0.001 | 0.001 |
| 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 | 0.001 | 0.001 |
| 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".