NASA rover finds three distinct water episodes in Mars' Jezero crater
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NASA's Perseverance rover found evidence of three distinct water episodes in the Margin Unit of Mars' Jezero crater, according to a study published September 21, 2026 in Communications Earth & Environment. The discovery challenges the hypothesis that carbonates formed solely from a crater lake. The findings suggest each episode could have created conditions suitable for microbial life.
Key Facts
- The study was published in Communications Earth & Environment on September 21, 2026.
- Perseverance analyzed more than 185 points on rock outcrops across an elevation range of about 265 meters in the Margin Unit.
- The third water episode left veins about 25 centimeters thick containing calcium sulfate and fluorite.
- The SuperCam laser spectrometer on the rover's mast can analyze mineral composition at distances up to six meters without physical contact.
Three Water Episodes
The first episode involved carbon dioxide-rich groundwater reacting with olivine and filling rock fractures with carbonate minerals. The second episode was linked to the existence of a crater lake, which altered the olivine composition and deposited silicate minerals. The third episode was thermal, with hot groundwater circulating through volcanic rocks and leaving veins about 25 centimeters thick containing calcium sulfate and fluorite.
Scientific Reaction
Lead author Candice Bedford, a research scientist at Purdue University, said the reality was far more complex than the pre-arrival hypothesis that carbonates formed from lake contact. University of Hawaii planetary scientist Eleni Ravanis noted the presence of silicate minerals in the rocks requires further study. Researchers called the Margin Unit a 'crossroads of water systems,' with each episode involving different sources and circulation mechanisms.
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