VEIN GRAPHITE FROM THE BOGALA AND KAHATAGAHA-KOLONGAHA MINES, SRI LANKA: A POSSIBLE ORIGIN
Bibliographic record
Abstract
We report results on the physicochemical attributes and geological context of vein graphite from the Bogala and Kahatagaha– Kolongaha mines, Sri Lanka, according to their morphology and texture. Each type has been characterized with means of X-ray diffraction, Raman spectrometry, oxyreactive and differential thermoanalysis, and measurements of the ratio of the carbon isotopes, 13 C/ 12 C. The carbon isotopic data for the Bogala graphite, expressed as δ 13 C, are in the range of −8.3 and −10.4‰, and the data for the Kahatagaha–Kolongaha graphite are in the range of −7.9 and −9.3‰. These values of δ 13 C values are not consistent with graphite mineralization due to granulite metamorphism, but rather with a magmatic origin. In a single vein of Bogala graphite, we can observe successive morphologies from the wallrock to the central part of the vein. In this textural transition, the δ 13 C decreases as the carbon content increases from 93 to 98%.
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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 | 0.001 | 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) | 0.000 | 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 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".