Water in Eclogite and Pyroxenite Xenoliths From the Bottom 100 km of the Slave Craton (Canada) Mantle Root
Bibliographic record
Abstract
Abstract Major and trace elements, including H 2 O, were determined in garnet and clinopyroxene to constrain the evolution of mantle xenoliths from Diavik, Canada. The 20 samples, derived from 120 to 220 (240) km depth, define a geotherm equivalent to 37 mW/m 2 surface heat flow and include three eclogite (A, B, C) and two pyroxenite (B, C) types (A: High Ca/low Mg, B: High Ca/high Mg; C: Low Ca/high Mg). C‐type samples invariably come from lower depth (<175 km) than B‐types (>200 km); type‐A eclogite is present in both intervals. The contents of hydroxyl (referred to as “structural H 2 O” and given as μg/g H 2 O) in clinopyroxene of B‐type eclogite and pyroxenite (360–1,149 and 225–1,509 μg/g) are higher than in C‐type samples (123–165 and 321–393 μg/g). Moreover, clinopyroxene in eclogite has lower H 2 O contents relative to pyroxenite. Structural H 2 O of clinopyroxene is positively correlated to Cu, Ni, and K but not to major elements. In garnet, contents of structural H 2 O are low (0–41 μg/g) and correlate neither with rock type nor with mineral composition. Most garnets additionally contain molecular (non‐structural) water, being correlated to compositional parameters of both garnet (positive: Mg; negative: Ca, Sr, Be, Na) and clinopyroxene (positive: MREE, Ca, Th; negative: Al, K, Na, Li). Structural H 2 O in clinopyroxene and garnet does not correspond to PT conditions but was affected by secondary, metasomatic processes. Most likely, pyroxenite formed from eclogite by metasomatic changes resulting in lower clinopyroxene Na and Zn contents and enhanced Mg#, Cr, Sr, REE, Pb, Th, U, and Cu.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.000 |
| 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 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".