Tuffisitic kimberlites: mineralogical characteristics relevant to their formation
Bibliographic record
Abstract
Tuffisitic kimberlites (TK) are the dominant components of many kimberlite pipes in southern Africa.These rocks are distinct from all other textural varieties of kimberlite.The objective of this study is to investigate the optically intractable features of TK using back-scattered electron (BSE) petrography and quantitative compositional data.The study involves TKs from the Wesselton Mine, a type area pipe in Kimberley, South Africa.Wesselton was selected because: it has been mined since 1890, it is a type locality for fresh archetypal holocrystalline coherent kimberlite (13-33 modal % olivine macrocrysts, 16-26 modal % olivine phenocrysts, 4 -16 modal % monticellite, up to 13 modal % groundmass phlogopite, up to 16 modal % carbonate, serpentine, spinel, perovskite, apatite, but no clinopyroxene; and detailed investigations have shown that the pipe includes at least ten phases of kimberlite ranging from typical hypabyssal kimberlite (HK) to volumetrically significant TK to depths of >930 m as well as HK to TK transitional textures (Fig. 1; Clement 1982, Shee 1985).
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| 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".