Chang’e-6 Samples Uncover 7 Water-Rich Asteroid Fragments, Challenging Earth’s Meteorite Record
Updated
Updated · spacedaily.com · Jul 17
Chang’e-6 Samples Uncover 7 Water-Rich Asteroid Fragments, Challenging Earth’s Meteorite Record
1 articles · Updated · spacedaily.com · Jul 17
Summary
Seven microscopic clasts in Chang’e-6 lunar samples were identified as CI-like chondrite relics, potentially the first confirmed fragments of that rare water-rich asteroid class found in Moon material.
Researchers sifted more than 5,000 particles from the far-side return and matched the seven grains’ chemistry and isotopes—notably iron-manganese ratios, nickel and chromium oxides, plus oxygen and silicon signatures—to a non-lunar origin.
The find matters because CI chondrites are fragile, hydrated and scarce in Earth collections, making terrestrial meteorite records likely biased against water-rich impactors that burn up, weather away or go unrecognized.
Chang’e-6 returned the samples from the Apollo Basin inside the South Pole-Aitken Basin in June 2024, giving scientists regolith from an ancient impact zone that can preserve mixed debris from long-vanished strikes.
The study does not quantify how common such impactors were, but it suggests lunar regolith may preserve a less biased archive of volatile-rich bodies that hit the early Earth-Moon system.
Did asteroid fragments found on the Moon deliver the water that sparked life on Earth?
What other solar system secrets are preserved in the dust of the Moon's unexplored far side?
Chang'e-6 Mission Uncovers Rare Water-Rich Meteorites on Moon's Far Side, Challenging Earth's Ocean Origin Theories
Overview
In June 2024, the Chang'e-6 mission made history by returning samples from the Moon's far side, where scientists discovered seven rare olivine-bearing fragments. These unique pieces, collected from an ancient lunar basin, were carefully analyzed by a research team from the Guangzhou Institute of Geochemistry. Their study, published in the Proceedings of the National Academy of Sciences, revealed that the fragments are remnants of carbonaceous Ivuna-like (CI) chondrites—materials similar to those found on certain asteroids. This breakthrough provides new insights into the early solar system and the delivery of water and volatiles to the Moon and Earth.