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 [1] and are associated with several ore deposit types, such as magmatic Cu-Ni-PGE deposits and kimberlites.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. [2]t includes mafic to intermediate volcanic rocks as well as intermediate to felsic intrusive bodies. [2]Timing of the Altai-Sayan LIP is poorly constrained, with an approximate age of 408-393 Ma. [3] The Yakutsk-Vilui LIP is located at the eastern edge of the Siberian craton and is represented by a rift system and radiating dyke swarm. [2]It is associated with many diamondiferous kimberlites and is of some economic importance. [2]Previous work has reported an age of 370-360 Ma. [4] The Late Devonian Mass Extinction event represents one of the greatest declines in biodiversity in the Phanerozoic.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. [5]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. [6]
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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) | 0.022 | 0.001 |
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; both teacher heads agree on what is shown here.
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".