Rapid Release of Molecular Hydrogen during Anaerobic Weathering of Basaltic Glass
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Bibliographic record
Abstract
Sampling strategies for the Mars 2020 rover mission require a better understanding of water-rock interactions in basalt-derived sediments and sedimentary structures that can be produced by these interactions. Millimeter-scale early diagenetic nodules and spindle-shaped ridges associated with early diagenetic cements in the Sheepbed mudstone of the Yellowknife Bay formation in Gale crater present intriguing examples of such structures These nodules and ridges are tentatively attributed to the production of gas within sediments and subsequent lithification. We experimentally constrain conditions conducive to the abiotic generation of gases in Mars-analog sediments incubated in sterile water in equilibrium with 0.05-0.2 bar CO2/N2 at pH 6.5-7 and 22 C. The most vigorous H2 release, 23 nmol(H2) hr -1 g -1 (sediment), was measured during the anaerobic weathering of basaltic glass. This process released dissolved Fe and silica and was accompanied by the formation of millimeter-sized gas bubbles. The bubbles were trapped within clay-sized sediments that were highly magnetic. Within weeks, the topography of the sediment surface roughened and exhibited linear ridge-like structures. These experiments identify the weathering of basaltic glass under a high-pCO2 atmosphere as a plausible mechanism for the production of H2 gas during sediment deposition in martian lakes. This process may have contributed to the warming of Mars' climate, formation of authigenic minerals such as magnetite [3] and the supply of H2. It may also explain the origin of magnetite-rich sediments observed at Gale and the strong magnetization of martian crust. The rapid released H2 may have served as an electron donor for any abiotic, prebiotic, and biotic redox reactions that took place during the formation of river networks and lakes on Mars.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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 it