Hydrated Silica in Oxia Planum, Mars
Bibliographic record
Abstract
Abstract Hydrated silica (SiO 2 ·nH 2 O; opal) is important for understanding the geological and aqueous history and habitability of Mars, owing to its genesis in a wide range of aqueous environments and its high biosignature preservation potential relative to other hydrated minerals. Utilizing multispectral CaSSIS and hyperspectral CRISM data, we investigated opal‐bearing deposits in Oxia Planum, the future landing site of the ExoMars “ Rosalind Franklin ” rover, in order to further assess the region's aqueous geology and astrobiological potential. Additionally, we used CaSSIS color band ratio composites to expand the CRISM data and identify discrete deposits of hydrated silica throughout the sedimentary fan stratigraphy, and identify potential opal‐bearing deposits within the Rosalind Franklin landing ellipses. We have detected opal‐bearing material in two main physiogeographic regions of Oxia Planum: (a) stratigraphically between the clay‐bearing plains and the overlying sedimentary fan, and (b) in discrete outcrops in topographic lows south of the fan deposits. Amorphous opal, likely derived from weathering processes, is the dominant form of hydrated silica in Oxia Planum. Whilst a detrital origin for the hydrated silica‐bearing deposits cannot be conclusively ruled out, an authigenic origin, or one in which opaline silica is concentrated by groundwater or pedogenic silicification processes, remains the most plausible formational hypotheses. These outcrops offer exciting prospects for in situ astrobiological exploration, which will allow for these hypotheses to be tested.
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 | 0.001 | 0.001 |
| 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".