Ancient Martian Meteorite Teghaza 001 Offers New Insight into Early Mars Crust and Water Activity
Researchers report that the 4.1-billion-year-old meteorite Teghaza 001, found in the Sahara, contains rare evidence of Mars' early crust formation and interaction with liquid water.
Scientists have confirmed that the rose-colored meteorite Teghaza 001, recovered from the Sahara Desert in 2022, is one of the oldest Martian rocks ever identified on Earth, dating to more than 4.1 billion years ago. The specimen provides a well-preserved record of the Red Planet during a time when its crust was forming and water was present on the surface.
The findings, published in Science, were led by Yang Liu of NASA’s Jet Propulsion Laboratory. > "It was only after we started looking closely that we realized this meteorite is really unique," Liu said, noting that a peer reviewer described the rock as a "Rosetta Stone for Mars."
Teghaza 001, weighing about 800 grams, contains an unusual mix of volcanic minerals that suggest it crystallized from deep-magma in the ancient crust before later alteration by liquid water. Co-author Lee Saper, now at NASA’s Ames Research Center, said the meteorite likely originates from Mars' heavily cratered southern highlands, a region whose crust has not been sampled before. > "It records interactions of water and rock and maybe even an imprint of the Martian atmosphere as it was losing water," Saper added.
Zircon crystals within the rock acted as precise geological clocks, allowing researchers to date both the rock’s formation and a later water-related alteration event to around 4.1 billion years ago. These results support growing evidence that Mars hosted an active water cycle far earlier than previously thought.
A novel age-dating technique using rubidium-strontium isotopes on individual mineral grains enabled the analysis of a fragment smaller than a fingernail while preserving most of the sample. Co-author François Tissot of Caltech explained that their laboratory is among the few worldwide capable of such precise dating and hopes the method will be applied to additional Martian meteorites and future planetary samples. > "Our hope is to pave the way for dating even more Martian meteorites, or samples returned from other planets, their moons, and asteroids," Tissot said.
The research team emphasizes that Teghaza 001 likely holds further information about early Martian geology, water activity, and atmospheric evolution, and that ongoing studies by laboratories worldwide will continue to uncover its secrets.