U-Pb CA-ID-TIMS age and geochemistry of the felsic rocks associated with the Late Devonian Yakutsk-Vilyui LIP, Siberian Craton
Bibliographic record
Abstract
New geochronological and geochemical data are reported for the Yakutsk-Vilyui Large Igneous Province (YV-LIP) of the Siberian Craton. We report a high-precision U-Pb zircon CA-ID-TIMS age of 366.14 ± 0.28 Ma for the felsic Olekminsk Stock, located within the Chara-Sinsk mafic dyke swarm of the Vilyui paleorift. The age falls within the broader ~ 390–360 Ma timeframe of the YV-LIP magmatic event. Two magmatic pulses (stages) have been previously distinguished through geological mapping and based on a limited set of high-precision geochronology, their ages are ~378–373 Ma for Stage 1 and ~366–362 Ma for Stage 2 (with inclusion of our new U-Pb age for the Olekminsk Stock). Both magmatic stages are plume-derived and Stage 2 is associated with maximum rifting. Geochemical data link the felsic Olekminsk Stock with the YV-LIP and the formation of the Vilyui paleorift, and indicate involvement of both mantle and lithospheric sources in the formation of the felsic rocks. During Stage 2, mafic melts generated in the upper mantle (from the plume) ascended to form an intermediate chamber at the base of the crust. This induced partial melting of the lower crust (including melting of mafic underplate produced during Stage 1), and emplacement of felsic massifs in the upper-middle crust. The 366.14 ± 0.28 Ma age for the Olekminsk Stock suggests a temporal coincidence with Late Devonian extinction events, particularly the ~365 Ma Annulata Event.
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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) | 0.006 | 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".