The mineral and isotopic signatures of glacially eroded sediments exported from Hudson Strait to the Labrador Sea during Hudson Strait Heinrich events H0 to H4
Bibliographic record
Abstract
ABSTRACT The sediment signature of glacial erosion products exported from Hudson Strait to the Labrador Sea during Hudson Strait Heinrich (HS‐H) events is evaluated using four distinct proxies: paired δ 18 Ο and δ 13 C data on the carbonate fraction, εNd and U–Pb isotopes in the silicate fraction, the mineral composition of the <2 mm bulk sediment fraction, and the lithologic composition of the >2 mm granules. Most detrital carbonate was eroded from Ordovician limestones on the floor of Hudson Strait. Silicate components were derived largely from Paleoproterozoic metamorphic and igneous bedrock, mostly on southern Baffin Island. A five‐component sediment unmixing model shows that HS‐H sediments were predominantly from Hudson Strait, whereas intervening sediment in the SW Labrador Sea has a predominant signature from Labrador but includes some detrital carbonate. Carbonate derived from the Western Basin and red sandstone granules from Keewatin are most abundant in the early part of HS‐H 1, 2, and 4. Sediment budgets imply 10–15 m deepening of Hudson Strait over the last glacial cycle. The magnitude and longevity of detrital carbonate transport by icebergs during HS‐H events require the inmixing of debris throughout the entire ice stream as it crossed the Abloviak sill.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".