Carbonaceous chondrite meteorites record the earliest stages of Solar System geological activities and provide insight into their parent bodies’ histories. Some carbonaceous chondrites are volumetrically dominated by hydrated minerals, providing evidence for low-temperature, low-pressure aqueous alteration1. Others are dominated by anhydrous minerals and textures that indicate high-temperature metamorphism in the absence of aqueous fluids1. Evidence of hydrous metamorphism at intermediate pressures and temperatures in carbonaceous chondrite parent bodies has been virtually absent. Here we show that an ungrouped, aqueously altered carbonaceous chondrite fragment (numbered 202) from the Almahata Sitta (AhS) meteorite contains an assemblage of minerals, including amphibole, that reflect fluid-assisted metamorphism at intermediate temperatures and pressures on the parent asteroid. Amphiboles are rare in carbonaceous chondrites, having only been identified previously as a trace component in Allende (CV3oxA) chondrules2. Formation of these minerals would require prolonged metamorphism in a large (about 640–1,800 kilometres in diameter) asteroid that is as yet unknown. Because Allende and AhS 202 represent different asteroidal parent bodies, intermediate conditions may have been more widespread in the early Solar System than is recognized from known carbonaceous chondrite meteorites, which are likely to represent a biased sampling.
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V.E.H., C.A.G. and M.E.Z. are supported by grant 80NSSC19K0507 from NASA’s Emerging Worlds programme. M.E.Z. was also supported by the Hayabusa2 Participating Scientist Program (NASA). A. Fioretti initially recognized and selected AhS 202 for analysis, made the mount and collected early scanning electron microscopy observations. We thank J. Filiberto (LPI/USRA) for contributing to scientific discussions. The Lunar and Planetary Institute (LPI) is operated by Universities Space Research Association (USRA) under a cooperative agreement with the Science Mission Directorate of NASA. This is LPI Contribution no. 2546.
The authors declare no competing interests.
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Hamilton, V.E., Goodrich, C.A., Treiman, A.H. et al. Meteoritic evidence for a Ceres-sized water-rich carbonaceous chondrite parent asteroid. Nat Astron 5, 350–355 (2021). https://doi.org/10.1038/s41550-020-01274-z