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Impact-driven oxidation of organics explains chondrite shock metamorphism dichotomy
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Impact-driven oxidation of organics explains chondrite shock metamorphism dichotomy
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Journal Article
Impact-driven oxidation of organics explains chondrite shock metamorphism dichotomy
2025
Overview
Shocked meteorites can be used to probe the dynamics of the early Solar system. Carbonaceous chondrites are less shocked than ordinary chondrites, regardless of the degree of aqueous alteration. Here, we show that this shock metamorphic dichotomy is a consequence of impact-driven oxidation of organics that are abundant in carbonaceous but not ordinary chondrites. Impact experiments at 3–7 km s
−1
using analogs of chondrite matrices reveal evidence of local heating in the matrix up to ~2000 K. Impacts on carbonaceous asteroids cause explosive release of CO and/or CO
2
, which can efficiently remove evidence of shock. We show that highly shocked materials are lost to space from typical-sized chondrite parent bodies (~100 km in diameter), but are retained on the largest known carbonaceous asteroid, namely, (1) Ceres, due to its stronger gravity. Ceres’ surface is thus a witness plate for the ancient impact environment of carbonaceous chondrite parent bodies.
Due to its strong gravity, Ceres’ surface still retains evidence of past collisions, which have been lost via impact-driven oxidation of organic material from typical C-rich asteroids, according to impact experiments
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
