Influence of the western inlet on the northern delta in Jezero crater, Mars: Topographic-compositional analysis and sediment transport modeling
Bibliographic record
Abstract
One of the challenges in reconstructing the water history of Jezero crater, Mars, is understanding the relationship between the deposition of the western and the northern deltas. Although the western delta appears to be less eroded and younger than the northern delta, multiple scenarios for their deposition have recently been proposed, including simultaneous formation of the northern and western fans/deltas. In our study, we combined topographical and compositional data to determine the origin of the low-calcium pyroxene (LCP) and olivine/carbonate units which were found within the northern and western deltas . We investigated whether these units are representative of the structure of the northern delta, and after analyzing the combined topographic and compositional profiles, no prominent stratigraphic correlations showing parallel layering were found. Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) data shows that the closest possible source of LCP is the western delta and the watershed of the western inlet. Therefore, we interpret the uppermost LCP unit within the northern delta as material transported from the western inlet which draped the already existing topography of the northern delta. That means that the northern delta (except for several locations between the delta and buttes) was already eroded to the current topography before the deposition of the LCP unit. To test this interpretation, we modeled the distance at which sediments transported from the western inlet through the channel on the western delta would be deposited. The results are consistent with the location of the LCP unit on top of the northern delta. That leads to the conclusion that there was a period when an active western inlet provided sediments which covered parts of the already eroded northern delta. Therefore, the main body of the Jezero's northern delta is older than the western delta but was partly covered with a relatively thin younger layer of material from the western inlet.
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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 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".