Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) inferred from biogeochemical and microfossil proxies
Why this work is in the frame
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Bibliographic record
Abstract
Nettilling Lake (Baffin Island, Nunavut) is currently the largest lake in the Canadian Arctic Archipelago. \nDespite its enormous size, this freshwater system remains little studied until the present-day. Existing \nrecords from southern Baffin Island indicate that in the early postglacial period, the region was submerged \nby the postglacial Tyrell Sea due to isostatic depression previously exerted by the Laurentide Ice \nSheet. However, these records are temporally and spatially discontinuous, relying on qualitative \nextrapolation. This paper presents the first quantitative reconstruction of the postglacial environmental \nsuccession of the Nettilling Lake basin based on a 8300 yr-long high resolution sedimentary record. Our \nmulti-proxy investigation of the glacio-isostatic uplift and subsequent changes in paleosalinity and \nsediment sources is based on analyses of sediment fabric, elemental geochemistry (m-XRF), diatom \nassemblage composition, as well as on the first diatom-based oxygen isotope record from the eastern \nCanadian Arctic. Results indicate that the Nettilling Lake basin experienced a relatively rapid and uniform \nmarine invasion in the early Holocene, followed by progressive freshening until about 6000 yr BP when \nlimnological conditions similar to those of today were established. Our findings present evidence for \ndeglacial processes in the Foxe Basin that were initiated at least 400yrs earlier than previously thought.
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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 | 0.001 | 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 it