Peridotite xenoliths of the Chidliak kimberlite province (NE Canada): the North Atlantic cratonic mantle with recent thermal and Ti-Na metasomatic disturbance
Bibliographic record
Abstract
We studied the petrography, mineralogy, thermobarometry and whole rock chemistry of 120 peridotite and pyroxenite xenoliths collected from the 156-138 Ma Chidliak kimberlite province (Southern Baffin Island).Xenoliths from pipes CH-1, -6, -7, and -44 are divided into two garnetbearing series, peridotites and wehrlites -olivine pyroxenites.The peridotites may contain spinel (37-62 wt% Cr2O3), while wehrlites may contain picroilmenite.Peridotites and wehrlites show widely varying textures, from coarse to sheared.Xenoliths from the CH-6 pipe differ from xenoliths in other pipes in terms of their petrography and relative abundances of rock types.Textures indicating the late formation of garnet and clinopyroxene are present in all xenolith series, with the most common texture being garnet mantled by clinopyroxene.Pyroxenes are invariably rimmed by secondary calcic minerals, which appear as dark coronas.SEM observations identify these as 3-15 micron thick mantles of clinopyroxene (on orthopyroxene) and monticellite (on clinopyroxene).
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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 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".