Brief
Perseverance rover uncovers layered water history in Jezero’s Margin Unit
SuperCam analysis shows igneous rocks in Jezero’s Margin Unit interacted with water on at least three separate occasions.
By Felo News Desk · Published
NASA's Perseverance rover has identified a complex sequence of water activity in the "Margin Unit" of Jezero Crater, scientists reported on 30 September 2026.
What happened
During its 2023 traverse of the inner rim of Jezero Crater, Perseverance examined roughly 870 feet (265 meters) of elevation within the Margin Unit. The rover’s SuperCam instrument analyzed more than 185 bedrock targets, using a laser that can fire from up to 6.5 meters away to generate plasma spectra of the rocks.
What the reports add
The study, published in the journal Communications Earth & Environment, indicates that the igneous rocks in the Margin Unit recorded at least three separate water‑related events: an ancient lake that once filled Jezero, later groundwater flow, and a subsequent episode of hydrothermal activity. Researchers noted that the carbonate signatures previously detected from orbit, once thought to stem solely from the lake, actually reflect this more intricate history.
What was said
"Before we arrived at the Margin Unit, the main hypothesis — derived from orbital observations — was that the carbonate seen from orbit formed from interaction with the lake that existed in Jezero Crater," Candice Bedford, a research scientist at Purdue University and lead author, told ScienceDaily.
Bedford added that the findings are significant because Jezero Crater contains one of the largest carbonate exposures on Mars, meaning the results have implications beyond this single site.
Key facts
- Perseverance studied over 185 bedrock targets in Jezero's Margin Unit using SuperCam. (sciencedaily.com)
- The Margin Unit rocks show evidence of three distinct water events: lake, groundwater, and hydrothermal activity. (sciencedaily.com)
- SuperCam can fire its laser up to 6.5 meters (21 feet) away to create plasma for spectral analysis. (sciencedaily.com)
- Findings were published in Communications Earth & Environment. (sciencedaily.com)
Sources
- [1] sciencedaily.com — originally reported as “NASA's Perseverance Mars rover finds groundwater, lakes, and hot fluids in one place”
