The Age Distribution Pattern of Precambrian Detrital Zircons in the Section of the Yuryuzan–Sylva Depression of the Cis-Uralian Foredeep Based on U–Pb LA-ICP-MS Isotope Dating: Single Source Demolition Indicator
Bibliographic record
Abstract
Abstract The Yuryuzan–Sylva Depression, а part of the Cis-Uralian Foredeep, is filled with flysch-molasse complexes dated to the interval from the Moscovian Stage of the Middle Carboniferous to the Artinskian Stage of the Lower Permian. Nine samples for geochronological studies were collected from different levels of the section for extraction and the subsequent dating of detrital zircons. The distribution of Precambrian zircons in the total zircon population is of particular interest. The proportion of Precambrian zircons generally decreases from 97 to 4% from bottom to top. At the same time, the age distribution spectra of these zircons are similar throughout the section, suggesting a single source for them. In addition, these spectra are similar to those of zircons from the Vendian Asha Group of the Bashkir Megazone, which, apparently, was the source of Precambrian zircons for the Upper Paleozoic formations of the Yuryuzan–Sylva depression. The Riphean rift-related complexes of the Bashkir Megazone and the Archean–Early Proterozoic complexes of the Taratash high were not included in this provenance area.
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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 | 0.001 | 0.001 |
| 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) | 0.001 | 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".