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- W4313366951 abstract "Abstract Iron‐rich olivine (Fe contents ≥20%) is widely distributed on Mars, but its dissolution rates, weathering products, and particularly Fe behavior under Mars‐relevant conditions are largely unconstrained. Here, we experimentally investigate the dissolution of synthetic Fe‐rich olivine (Fa 29 to Fa 100 ; grain size ∼53 μm) for a water‐limited cryogenic sulfuric weathering scenario at 233 K. Fayalite (Fa) and forsterite (Fo) in Fo‐dominant olivine dissolve simultaneously, whereas fayalite dissolution in Fa‐dominant olivine is hindered. Primary alteration products are Fe II ‐Mg‐sulfates and amorphous silica with minor ferric sulfates and gypsum. Freezing and acidic conditions enhance Fe mobility and subsequent Fe cycling on Mars. The lifetime of Fe‐rich olivine is two to three orders of magnitude shorter than that of Mg‐rich San Carlos olivine. The cryogenic sulfuric weathering scenario greatly challenges the survival of Fe‐rich olivine. Spatial and temporal restrictions for acid‐olivine interactions or insufficient sulfur supply relative to olivine are essential to preserving olivine throughout cold and icy ancient Mars." @default.
- W4313366951 created "2023-01-06" @default.
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- W4313366951 date "2022-12-30" @default.
- W4313366951 modified "2023-10-17" @default.
- W4313366951 title "Cryogenic Sulfuric Weathering and Challenges for Preserving Iron‐Rich Olivine on Cold and Icy Mars" @default.
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- W4313366951 doi "https://doi.org/10.1029/2022je007593" @default.
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