Spectral Effects of Heating C3.00-Ungrouped Chwichiya 002 and Other Type 3 Carbonaceous Chondrites Under Vacuum
Bibliographic record
Abstract
Three petrological type-3 carbonaceous chondrites; C3.00-ungrouped Chwichiya 002, CV3ox NWA 14743, and CK3 NWA 15337 were heated under vacuum up to 700℃. Additionally, carbonaceous chondrite matrix constituents: saponite and serpentine were also heated under the same conditions up to 900℃. Bi-directional reflectance spectroscopy data were collected under vacuum. The spectra show variability in their albedo as temperature increases. Measurements were made using a Bruker 80v FTIR spectrometer, at a resolution of 4 cm-1, relative to Spectralon and InfraGold in the VISNIR and IR, respectively. The 2.7 µm OH-associated absorption feature remains consistent in the meteorites, whereas the phyllosilicates display a gradual weakening of the same feature. The aromatization and volatilization of carbon, organic matter, and opaques such as sulfides could explain the increase in albedo observed. As heating ensues, the reaction of primary silicates with evolved water could lead to deepening and the persistence of the 2.7 µm band in the meteorites. The characterization of the spectral properties of the primitive carbonaceous chondrites presented in this study could help understand and interpret future experiments and help establish any links to parent-body asteroids.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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 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".