While exploring the rim of Jezero Crater, Perseverance spotted small, pale rocks that differed from the local bedrock. Spectroscopic analysis revealed tiny grains of corundum—the mineral responsible for rubies and sapphires on Earth.
The find baffled scientists because corundum requires high aluminum and very low silicon to form. These rocks were packed with silicon, which normally consumes available aluminum before corundum can take shape.
How They May Have Formed
Research led by Ann Ollila at Los Alamos National Laboratory suggests a potential origin story:
- Extreme Impact Energy: The massive meteorite collision that created Jezero Crater generated immense heat and pressure, potentially altering the rock's chemical composition instantly.
- Post-Impact Fluids: Fluids moving through the shattered rock after the crash could have further altered its chemistry into what Perseverance detected.
- Supporting Clues: The rocks' fine grain size, position on the crater rim, and proximity to related formations strongly point toward an impact origin, though it remains a leading hypothesis rather than a proven fact.
If confirmed, these findings indicate that meteorite impacts played a much larger role in shaping Mars’ mineral diversity than previously recognized.
Source: Phys.org
