Perseverance finds light-toned rock field beyond Jezero rim
Perseverance discovered light-toned rocks in Lac de Charmes, with data indicating gabbro and possible breccia beyond Jezero crater's western rim.
- Perseverance found a vast field of light-toned rocks in Lac de Charmes beyond Jezero crater's western rim.
- The rocks are unusual because Mars is mostly dark basalt, and data indicate many are gabbro.
- Gabbro forms when magma cools slowly deep in the crust, suggesting the site may expose ancient bedrock.
- Initial images show angular fragments in breccia, which could link to asteroid impacts on early Mars.
- The findings show how impact excavation can expose deep crustal rocks on rocky planetary surfaces.
What happened
Alex Jones, a Ph.D. candidate at Imperial College London, announced on 2026-09-29 that Perseverance has discovered a vast field of light-toned rocks. Perseverance is exploring Lac de Charmes, an area of ancient rock beyond the western rim of Jezero crater.
What we know
Perseverance is exploring Lac de Charmes, an area of ancient rock beyond the western rim of Jezero crater. It has discovered a vast field of light-toned rocks there.
Mars is dominated by dark-colored basaltic rocks, but the science team is interested in the light-colored rocks.
Perseverance is investigating the composition and textures of the rocks. Data indicate many of the rocks are gabbro.
Gabbro is dominated by minerals rich in iron and magnesium. It typically forms when magma cools slowly and crystallizes deep in the crust.
Perseverance is investigating a possible bedrock patch. Initial images suggest angular fragments forming breccia, and light-toned boulders may have eroded from that breccia.
Breccias form through violent fracturing and transport. Layers of breccia beyond Jezero have been linked in earlier work to asteroid impacts on early Mars, and the Jezero impact may have excavated the light-colored blocks.
Why it matters
For readers tracking the lunar industry, the findings show how impact excavation can expose deep crustal rocks and breccia, a process relevant to interpreting rocky planetary surfaces.
What we are not sure about
- The gabbro identification is based on data indicating many rocks are gabbro, not a definitive classification.
- Initial images only suggest angular fragments forming breccia.
- Light-toned boulders are possibly eroded from breccia.
- Layers of breccia beyond Jezero have been linked to earlier asteroid impacts, not definitively assigned.
- The Jezero impact is only possibly responsible for excavating light-colored blocks.
Sources
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