Extensive Lithological Diversity of Float Rocks at the Mount Washburn Mound in Neretva Vallis, Jezero Crater, Mars

Kurzfassung

While exploring Neretva Vallis in Jezero crater, NASA's Perseverance rover studied the light-colored hills called “Mount Washburn” on which a variety of rock types were found, including likely igneous rocks with variable levels of alteration. Some had unusual textures, but overall their compositions were broadly similar to rocks found elsewhere in the crater. The rover's instruments identified a variety of minerals, especially low-calcium pyroxene, along with signs of olivine, iron-rich materials, and minerals formed in the presence of water. The underlying bedrock had high amounts of silica and iron, and looked very similar to materials from a nearby area called Bright Angel—suggesting they may be part of the same geologic layer. Mount Washburn has one of the most diverse collections of rocks seen by a Mars rover within one setting, hinting at a complex geologic history. Materials like those from Bright Angel may have formed the base of Mount Washburn, and the larger rocks were added later by flowing debris. These findings suggest that Perseverance may encounter similar rocks during future exploration of Jezero crater's rim and surrounding plains, potentially revealing more about ancient Mars, including its volcanic activity, past water presence, and the makeup of the deeper crust.