Transmission electron microscopy of L-group chondrites. II Experimentally annealed Kyushu

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Annealing, Chondrites, Cracks, Dislocations (Materials), Electron Microscopy, Meteoritic Microstructures, Cooling, Glass, Olivine, Pyroxenes, Shock Waves, Temperature Effects, Meteorites, L Chondrites, Electron Microscopy, Tem, Experiments, Facies, Annealing, Samples, Meteorite, Kyushu, L6 Chondrites, Stony Meteorites, Procedure, Shock Effects, Parameters, Temperature, Distribution, Cracks, Structure, Olivine, Description, Mineralogy, Comparisons, Cooling Rates, Crystallization

Scientific paper

A chondrite specimen from shock facies d of Dodd and Jarosewich (1979) with naturally unannealed shock-deformation features in olivine was experimentally annealed to test directly the hypothesis that some differences between facies d and e can be attributed to greater effects of postshock static recovery in facies e. The results support a semiquantitative model for the annealing history of facies-e meteorites. The time scale for annealing was short at less than 10,000 s, and the temperatures were close to postshock maxima, at roughly 1000 C. These results are consistent with published estimates of initial cooling rates from Ar-diffusion/radiometric studies.

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