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When wet meets dry: An Ivuna-like impactor triggered volatile loss on the angrite parent body
Ke Zhu 朱柯1,2,3, Qi Chen4, Tetsuya Yokoyama5
1State Key Laboratory of Geological Processes and Mineral Resources, Hubei Key Laboratory of Planetary Geology and Deep-Space Exploration, School of Earth and Planetary Sciences, China University of Geosciences, Wuhan 430074, China.
Abstract:
Angrite meteorites remain the "driest" known planetary materials in the Solar System. Recent mineralogical and oxygen (O) isotope data suggest that the angrite parent body (APB) experienced a major impact, raising questions about the identity of the impactor. We report high-precision mass-independent chromium (ε54Cr) isotope data for eight angrites and their components. Samples from deeper APB regions exhibit uniform ε54Cr values (-0.40 ± 0.03), representing the mantle composition, whereas matrix materials from quenched angrites show anomalous ε54Cr values (0.27 ± 0.06 and -0.15 ± 0.08), likely reflecting impactor contamination. Combined Cr-O isotope data point to a CI (Ivuna-type) chondritic impactor-the "wettest" known Solar System material. Although such an impact could introduce volatiles, high-energy conditions likely caused extensive volatile loss, preserving the angrites' dry nature. CI contamination may also make quenched angrites unsuitable time anchors for siderophile short-lived chronometers, whereas the other "contamination-free" angrites yield a precise age of 4561.0 ± 0.9 million years, dating the formation of their mantle source.
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