NASA Perseverance Finds Evidence of Multiple Water Events on Mars
NASA’s Perseverance rover has found evidence that rocks in Mars’ Jezero Crater interacted with water at least three times, revealing a complex history of the planet’s ancient environment.
NASA’s Perseverance rover has found evidence that rocks along the edge of Mars’ Jezero Crater interacted with water at least three separate times, offering new clues about the planet’s ancient climate and potential habitability.
The discovery comes from the Margin Unit, a region that once bordered an ancient lake. Scientists had expected to find sedimentary rocks formed from lake deposits, but Perseverance instead identified igneous rocks that originally formed from magma beneath the Martian surface.
Using its SuperCam instrument, the rover analysed more than 185 bedrock targets. Scientists found that rocks at higher elevations showed limited signs of water interaction, while lower sections contained minerals and textures indicating repeated alteration.
The first episode appears to have involved carbon-dioxide-rich groundwater reacting with olivine, producing carbonate minerals that filled fractures. A second interaction may have occurred when the ancient lake occupied Jezero Crater, with silica found particularly in rocks believed to have been below the former waterline.
The third event appears to have involved much hotter underground water. Mineral veins containing calcium sulfate and fluorite suggest heated water circulated through volcanic rocks at a later stage.
The exact timing of these events remains uncertain, but the findings point to a more complicated water history at Jezero than previously understood. Such water-rock reactions could also have created chemical conditions capable of supporting microbial life, making the region important in the search for evidence of ancient habitability on Mars.
