U‐Pb Geochronology and Lu‐Hf Isotopic Characterization of the Canadian High Arctic Large Igneous Province (HALIP): Comparison to Oceanic Plateau Magmatism
Bibliographic record
Abstract
Abstract Recent high‐precision geochronological studies have delineated three main pulses of basaltic magmatism between ca. 130‐80 Ma in the Cretaceous High Arctic Large Igneous Province (HALIP) in northern Canada. Here we report new U‐Pb TIMS baddeleyite and zircon dates for samples from Axel Heiberg and Ellesmere Islands, which further support the duration and pulsed nature of the magmatism previously documented. We add new LA‐ICPMS U‐Pb zircon dates on samples analyzed in a previous study to help resolve age heterogeneity observed in some samples. We also report the first LA‐ICPMS zircon Lu‐Hf results from HALIP intrusives to better constrain the HALIP mantle source composition. Initial εHf zircon results for five HALIP basalts with minimal evidence for continental crustal contamination from the Canadian Arctic Islands range from +9.0 to +14.7, and indicate extraction from a depleted mantle source similar to plume‐derived oceanic plateaux such as Kerguelen.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.000 | 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".