Microstructures of High-Pressure Minerals in the Sixiangkou L6 Chondrite: Constraints on the Duration of Shock Events in Chondrites

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Kinetics, Microstructures, Minerals: High-Pressure, Shock, Timescales

Scientific paper

High-pressure minerals in the Sixiangkou (L6) chondrite contain micro-structures that can be used to constrain the time scale of shock metamorphism. Crystallization of majorite-pyrope garnet and magnesiowustite from a silicate melt at high pressure and temperature required micrometer-scale diffusion at high pressure. Large polycrystalline ringwoodites and majorites, formed by solid-state transformations, show evidence of annealing and dislocation recovery. These diffusion-controlled processes are inconsistent with the micro-second time scales generally accepted for shock metamorphism of chondrites.

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