U-Pb Geochronology of Two Devonian Large Igneous Provinces, Siberian Craton
Bibliographic record
Abstract
Large Igneous Provinces (LIPs) have been considered as drivers of large scale climatic change This study applies high precision U-Pb ID-TIMS (isotope dilution thermal ionization mass spectrometry) geochronology to intrusive rocks from the Yakutsk-Vilui and Altai-Sayan LIPs to improve our understanding of the timing and duration of large scale volcanism in Siberia during the Devonian. The Altai-Sayan LIP is located in the Central Asian Orogenic Belt in Siberia. t includes mafic to intermediate volcanic rocks as well as intermediate to felsic intrusive bodies. Timing of the Altai-Sayan LIP is poorly constrained, with an approximate age of 408-393 Ma. It is associated with many diamondiferous kimberlites and is of some economic importance. Previous work has reported an age of 370-360 Ma. Emplacement of the Yakutsk-Vilui (Y-V) traps has long been suspected of triggering some of the anoxic events that represent this extinction in the marine record. The Kellwasser anoxic event approximates the Frasnian-Famennian (F/F) boundary (GSSP Coumiac quarry, France) within the late Devonian, and has been inconclusively linked to Y-V magmatism. Our results from U-Pb CA-ID-TIMS dating methods on intrusive rocks of the Y-V LIP approximate the reported F/F boundary age of 371.86 0.08Ma.
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 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".