Mars exploration: Perseverance rover finds unexpected igneous rocks in Jezero Crater

NASA’s Perseverance rover has discovered unexpected igneous rocks in the Margin Unit of Mars’ Jezero Crater. These findings, published in Communications Earth & Environment, challenge previous assumptions that the area consisted primarily of sedimentary layers. The presence of these volcanic rocks reveals that the location served as a crossroads for multiple aqueous systems, preserving evidence of at least three distinct water interactions through carbonate and silica deposits.

Analysis of 185 bedrock targets using the rover’s SuperCam instrument identified eight distinct mineralogical groups, including iron-rich clusters and silica-rich phases. Research indicates that olivine was transformed into carbonate and silica through water interactions.

Complementing these findings, a study led by the Japan Aerospace Exploration Agency (JAXA) addresses the scarcity of carbonate rocks on the Martian surface. While Mars is believed to have once possessed abundant surface water and a thick atmosphere, surface carbonates are unexpectedly rare. Researchers suggest that feldspar-rich rocks show evidence of water interaction and propose that groundwater may have buried significant amounts of carbonates underground, potentially explaining the planet’s missing water history.