A XENOLITH-BASED LITHOSPHERIC TRANSECT OF THE SLAVE CRATON, N.W.T., CANADA
Bibliographic record
Abstract
During the last decade, the Canadian Slave craton has emerged as an important global diamond resource. Recent work on the sub-continental lithospheric mantle (SCLM) beneath this craton has yielded tantalising suggestions about its structure and composition that are of interest to the diamond mining effort. Geochemical studies of xenoliths, sulphides, diamond inclusions and mineral separates, together with teleseismic and magnetotelluric interpretations have indicated that the Slave SCLM has a unique stratified structure. This consists of a highly depleted mantle layer above ~110 km, most pronounced in the central Slave region, with a relatively ‘fertile’ layer of mantle beneath that extends to the base of the lithosphere. As diamond mining and exploration in the Slave craton matures, more samples are available for study, allowing testing of earlier models and refinements on existing geotherm estimates. This PhD provides new silicate major and trace element compositions, thermobarometry and rhenium-osmium (Re-Os) isotope data for two new suites of peridotite xenoliths from Slave craton kimberlites (Artemisia and Diavik), as well as new Re-Os data for existing suites from Gahcho Kué (Kopylova and Caro, 2004). Major element data from all localities are used to calculate new geotherms for the Slave Craton, using the method outlined by McKenzie et al (2005) and expanded by Mather et al. (2011). The average mineral compositions, rare-earth elements, Mg#, and Rhenium-depletion ages (TRD) for individual xenoliths from all localities are plotted on these new geotherms. The resulting patterns of TRD with depth are used to evaluate the suggestion that the Slave lithosphere is stratified in age as well as composition. Finally, all kimberlite localities studied are used as ‘pseudo-boreholes’ to create a 2-dimensional linear transect from NNW-SSE through the Slave SCLM. The lithospheric stratigraphy illustrated by this transect is used to comment on the apparent layered nature of the continental lithosphere beneath the Slave province and explore which, if either, of the two main craton formation hypotheses were operating during its genesis.
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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 | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".