Bright Angel Mudstones of Jezero Crater Exhibit Ferrous-Phosphate Nodules and Redox-Driven Reaction Fronts Indicating Habitable Conditions and Potential Biosignatures

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Tiny nodules of vivianite-like iron phosphate and reaction fronts hosting greigite iron-sulfide formed at low temperature in Bright Angel mudstone with organic matter, indicating a weathered, clay-rich, water-rich setting with redox-driven mineral changes and potential biosignatures that require Earth-based analyses and future lab work to confirm.

Redox-driven mineral and organic associations in Jezero Crater, Mars - Nature
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Redox-driven mineral and organic associations in Jezero Crater, Mars - Nature

A geological, petrographic and geochemical survey of distinctive mudstone and conglomerate outcrops of the Bright Angel formation on Mars reveals textures, chemical and mineral characteristics, and organic signatures that warrant consideration as potential biosignatures.