Perseverance finds organic carbon inside rocks at Jezero

NASA’s Perseverance rover detected organic carbon compounds trapped inside sedimentary rocks at Jezero Crater on Mars. The robotic vehicle uncovered the substances within fluvial deposits formed when liquid water flowed across the planet’s surface. Researchers date these geological layers to an ancient epoch defined by active hydrological cycles.

Researchers continue testing the Jezero samples.

Flowing streams once moved these mineral-rich deposits into Jezero Crater across millions of years, building dense sediment beds that locked primitive organic structures in place before the entire Martian surface lost its liquid reservoirs and turned into a barren desert. The ancient lake basin collected diverse mineral layers transported by incoming river channels throughout that wet period.

The journal Science Advances published the evaluation detailing how these primitive chemical compounds survived within the sediment. Scientists documented the exact mineral matrix holding the carbon signatures across the crater floor. The team mapped the distribution of these molecules along the river delta system.

Non-biological processes that could form the compounds

• Volcanic reactions occurring inside the planetary crust
• Extended chemical interactions between liquid water and native minerals
• Collisions of external space debris against the surface

These chemical signatures do not prove that microscopic life existed on Mars. Natural abiotic mechanisms produce identical organic molecules without any biological involvement.

Geologic stability sets Martian crust apart from Earth

Mars lacks the tectonic plate movement that constantly destroys and recycles continental crust on Earth. The neighboring planet also experiences negligible atmospheric weathering compared to terrestrial erosion rates. Because of this prolonged crustal stability, ancient Martian rocks preserve their original geochemical structures intact across billions of years. Investigators study these undisturbed strata to trace the historical progression of the Martian environment.

Carbon signatures offer clues for planetary habitability

On Earth, complex macromolecules provide the structural foundation for living cells and persist within ancient rocks as the sole remnants of primeval microbes.

Study co-author Ashley Murphy of the Planetary Science Institute noted that carbon forms the primary backbone of terrestrial biology. She explained that identifying whether Mars possessed the same fundamental building blocks helps determine the past habitability of the planet. Her analysis evaluated whether environmental conditions could have sustained primitive organisms during earlier epochs.