Supercontinent reconstruction of the microcontinents in Northeast China
Bibliographic record
Abstract
Abstract Northeast China, situated in the eastern Central Asian Orogenic Belt, is crucial for understanding the northeastern Asian continental framework and its tectonic evolution. This study compiled petrological, geochronological, and geochemical data from rocks of late Neoarchean to late Paleozoic time to constrain their tectonic origins and examine supercontinent reconstruction in Northeast China. Zircon age spectra from 5665 grains reveal distinct peaks in the late Neoarchean period (ca. 2500 Ma), late Paleoproterozoic (ca. 1800 Ma), Mesoproterozoic (ca. 1400 Ma), Neoproterozoic (900–600 Ma), and Pan-African (ca. 500 Ma). Late Neoarchean calc-alkaline volcanic arc granites indicate subduction-driven Archean continental growth in Northeast China. Late Paleoproterozoic calc-alkaline volcanic arc and syn-collisional granites in Northeast China indicate their involvement in the assembly of Columbia. Mesoproterozoic shoshonitic within-plate A-type granites indicate extensional tectonics coinciding with the breakup of Columbia. Grenville (ca. 1100 Ma) arc sediments and early Neoproterozoic (1000–850 Ma) calc-alkaline I-type granites indicate convergent tectonics corresponding to the assembly of Rodinia. Late Neoproterozoic (850–600 Ma) within-plate A-type granites indicate extensional environments linked to the breakup of Rodinia (ca. 825 Ma). Early Pan-African within-plate granites and high-grade metamorphism mark compressional subduction related to the assembly of Gondwana. The age peaks described here suggest that the microcontinents of Northeast China have exhibited consistent basement evolution since the late Neoarchean and maintained paleogeographic proximity to the Tarim Craton in the supercontinent cycle from Columbia to Rodinia and Gondwana. Late Pan-African shoshonitic A-type granites indicate extensional tectonics during the drift of Northeast China from Gondwana to the southern margin of the Siberia Craton.
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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 | 0.003 | 0.003 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".