The deglacial to postglacial marine environments of<scp>SE</scp><scp>B</scp>arrow<scp>S</scp>trait,<scp>C</scp>anadian<scp>A</scp>rctic<scp>A</scp>rchipelago
Bibliographic record
Abstract
Core 86027‐144 (74°15.56′N, 91°14.21′W) represents a rare, continuous record ofLatePleistocene toHolocene sediments fromHighArcticCanada extending from the end of theLastGlaciation. Based on microfossils (dinocysts, non‐pollen palynomorphs, benthic and planktonic foraminifera), foraminiferalδ18Oandδ13C, and sedimentology, seven palaeoenvironmental zones were identified. ZoneI(>10.8 cal. kaBP) records deglaciation, ice‐sheet destabilization, float‐off and subsequent break‐up. ZoneII(c. 10.8–10.4 cal. kaBP) shows ice‐proximal to ice‐distal glaciomarine conditions, interrupted by pervasive land‐fast sea‐ice marked by a hiatus in coarse sediment deposition. Significant biological activity starts in ZoneIII(10.4–9.9 cal. kaBP), where planktonic foraminifera (Neogloboquadrina pachyderma) suggest early oceanic throughflow. Surface waters flowedNW–SE; however, the deep‐water origin remains unclear (potentiallyNWArcticOcean orBaffinBay). Postglacial amelioration (open‐water season greater than present) in ZoneIV(9.9–7.8 cal. kaBP) perhaps corresponds to the regional ‘Holocene Thermal Maximum’ previously proposed. A transitional period (ZoneV; 7.8–6.7 cal. kaBP) of rapid environmental change fluctuating on a scale not observed today is marked by increasing sea‐ice and reduced oceanic influence. This probably signals the exclusion of deeperAtlantic water owing to the glacio‐isostatic shallowing of inter‐island sills, coupled with generally cooling climate. Conditions analogous to those at present, with increased sea‐ice and modern microfossil assemblages, commence atc.6.7 cal. kaBP(zonesVI–VII). Although climate ultimately forces long‐term environmental trends, core 86027‐144 data imply that regional dynamics, especially changes in sea‐level, exert a significant control on marine conditions throughout theCanadianArcticArchipelago.
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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 | 0.001 | 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) | 0.002 | 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".