Perseverance discovers multiple ancient water episodes in Jezero Crater’s Margin Unit
Perseverance’s SuperCam analysis revealed that rocks in Jezero Crater’s Margin Unit experienced at least three distinct water interactions, overturning prior expectations of simple lake sediment.
When Perseverance reached the inner edge of Jezero Crater’s Margin Unit, scientists anticipated sedimentary deposits from the ancient lake. Instead, SuperCam’s laser spectroscopy showed igneous rocks that had been modified by water three times. The first event involved CO₂-rich groundwater converting olivine to carbonate-filled fractures; the second added silica as the lake receded; the third produced thick veins of calcium sulfate and fluorite, indicating a later hot-water circulation.
The study, published in Communications Earth & Environment, emphasizes that Jezero Crater lies within a major carbonate exposure, making these results relevant to the broader Martian water record and the search for ancient life. Lead author Candice Bedford noted that such surprises reshape views of Mars’ early climate and habitability.
Why it matters
The discovery shows Mars had multiple water episodes, crucial for assessing its past habitability and guiding future life-search missions.
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