Study Maps 600-Km Mars Clay Belt, Boosting Rosalind Franklin's 2028 Life Search
Updated
Updated · EarthSky · Jun 14
Study Maps 600-Km Mars Clay Belt, Boosting Rosalind Franklin's 2028 Life Search
1 articles · Updated · EarthSky · Jun 14
Summary
A new study found Oxia Planum's clay deposits extend about 600 km and connect to Mawrth Vallis 300 km away, making the ExoMars landing zone far richer in water-formed minerals than previously thought.
Those clays are about 4 billion years old and likely among Mars' oldest preserved deposits, raising hopes they could retain traces of ancient microbial life for ESA's Rosalind Franklin rover to probe after its 2028 landing.
Orbital data from ESA's OMEGA and NASA's CRISM also identified a paleosurface between major clay units, pointing to a pause in deposition followed by a shift in water chemistry and mineralogy.
The scale of the deposits suggests either a regional ocean-related process or widespread groundwater flooding, a question the rover is expected to test directly on the surface.
The findings strengthen Oxia Planum's value not just for astrobiology but for reconstructing early Mars climate, which appears to have been intermittently wet.
How will Europe's rover finally confirm if ancient Martian organics are definitive signs of life?
What crucial lesson from NASA's Curiosity rover will be most vital for the success of Europe's new life-seeking mission?
Vast 600-Kilometer Clay Belt Unveiled on Mars: Implications for Life Detection and the ExoMars Rosalind Franklin Mission
Overview
In June 2026, scientists published groundbreaking research revealing a vast, 600-kilometer clay belt on Mars, stretching from Oxia Planum to Mawrth Vallis. This discovery, centered at the Rosalind Franklin rover's landing site, shows that Mars was once rich in water and had conditions suitable for life. The clay belt, formed around 4 billion years ago, contains phyllosilicate minerals that are highly valued for preserving signs of ancient life. Researchers also identified a paleosurface between clay layers, offering new clues about Mars’ changing environment and strengthening the case for exploring these deposits in the search for past life.