UV-VIS-NIR Reflectance Spectra of Intimate Mixtures of Synthetic CaCO3 and Amorphous SiO2: 0.35-2.5 µm; Implications for the Spectral Identification of Shocked Assemblages on Mars
Bibliographic record
Abstract
University of Winnipeg, 515 Portage Ave., Winnipeg, Manitoba, R3B 2E9. Introduction: Carbonates are important rock-forming minerals on Earth. They have been detected on Mars from both landed and orbital spacecraft as well as in Martian meteorites and also occur in many classes of meteorites. Many of these carbonates share the com-mon theme of being shocked due to meteorite impact. It is notable that the effects of shock on carbonates are still poorly understood [1]. As illustrated in [2], the shock and melting produced by hypervelocity impact events has a measurable effect on the reflectance spec-trum of carbonates. The reflectance spectra of these shocked/melted assemblages are so altered by the im-pact event they appear spectrally to be free of carbon-ate despite the clear presence of the crystalline carbon-ate calcite, as revealed by micro X-Ray diffraction (µXRD) [2]. In order to quantify these spectral changes a number of analytical techniques have been used to explore the alterations in gross mineralogy and the re-sultant spectra. Here we investigate the spectral fea-tures of a calcite + amorphous quartz mixture suite produced in an attempt to isolate the ~ 2.2 µm feature that would seem to be replacing the ~ 2.33 µm C-O stretching fundamental overtone of calcite in the spec-trum of the highly shocked oolitic limestone from the Haughton crater, HMP99-052, as shown in Figure 1. Experimental Procedure: The two synthetically produced samples of 99.999% pure calcium carbonate (CaCO
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 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".