Late Pleistocene Sediment Provenance and Paleoenvironmental Changes in the East Siberian Shelf Margin: Insights From Mineralogical and Nd Isotope Analysis
Bibliographic record
Abstract
Abstract This study examines sediment core ARA10C‐St16 from the East Siberian Shelf margin, which preserves a high‐resolution sedimentary record since Marine Isotope Stage 4 (MIS 4), and divides the core into five stratigraphic units. Mineralogical and geochemical proxies reveal that Unit 5, corresponding to the glacial period of MIS 4, shows characteristics typical of sediments from the East Siberian Sea, indicating sediment supply from nearby rivers or continental erosion. Units 2 and 3 both record increased input of sediments from North America, reflecting distinct phases of Laurentide Ice Sheet (LIS) dynamics. Unit 3, corresponding to a stadial phase within MIS 3, is interpreted to reflect sedimentation associated with LIS expansion and iceberg calving from the Canadian Arctic Archipelago. In contrast, Unit 2 is attributed to the Last Deglaciation during MIS 2 and reflects sediment delivery during LIS retreat, likely dominated by fine‐grained material transported from the Beaufort Sea region. The absence of typical glacial muds from MIS 2 in the study core suggests that the ESIS may have completely covered the area, limiting sediment accumulation. In interglacial/interstadial periods, Units 1 and 4 predominantly reflect Eurasian sources, with increased smectite content suggesting input from the Laptev Sea, particularly during periods of low sea level. These findings constrain late Quaternary sediment dispersal and glacial–marine interactions in the western Arctic, informing future reconstructions of ice‐sheet dynamics and sediment transport under changing climates.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".