Martian meteorite hides ancient water reservoir
A new study uncovers previously hidden hydrated minerals inside one of Earth's most famous Martian meteorites, providing direct evidence that liquid water once permeated the Red Planet billions of years ago.
Led by Estrid Buhl Naver from the Technical University of Denmark, researchers employed advanced non-destructive scanning techniques to probe the interior of NWA 7034, known as "Black Beauty." They identified hydrogen-rich iron oxyhydroxide clasts representing a newly discovered water reservoir in Mars' ancient crust, according to a preprint on arXiv. Phys.org reported the findings this week amid ongoing quests to unravel Mars' watery past, following NASA's recent cancellation of the Mars Sample Return mission.
Discovered in Morocco's Sahara Desert in 2011, Black Beauty comprises materials dating back about 4.48 billion years, among the solar system's oldest known Martian fragments. It formed when a massive impact on Mars melted and fused crustal pieces before ejecting them into space.
Neutron tomography and X-ray computed tomography revealed hydrogen-rich iron oxyhydroxides, labeled H-Fe-ox, making up 0.4% of the tested sample's volume. These clusters hold about 11% of the sample's total water content. Overall, Black Beauty contains roughly 6,000 parts per million of water, the highest among analyzed Martian meteorites. This non-destructive approach advances beyond traditional methods requiring sample cutting or dissolution.
The discovery aligns with NASA's Perseverance rover observations in Jezero Crater. Though from a different Mars location, hydrated iron oxyhydroxides in both suggest widespread subsurface water reservoirs on early Mars. "These alteration assemblages closely resemble those seen in Perseverance's Jezero Crater samples, where hydrated iron oxyhydroxides also appear," the researchers wrote.
The timing proves bittersweet. In January 2026, U.S. Congress confirmed no funding for NASA's Mars Sample Return, effectively canceling the program after budget concerns ballooned costs from an estimated $11 billion to a final $7 billion proposal. Researchers hoped to apply their CT scanning to Perseverance's sealed titanium tube samples on Mars' surface. "This magnificent meteorite essentially serves as a sample return mission in one rock," Phys.org noted. With China's Tianwen-3 sample return slated for the 2030s, Black Beauty remains Earth's prime window into Mars' ancient watery crust for now.
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