Abstract
WE report a hitherto unrecorded variety of shock-induced damage in the cohenite, (FeNi)3 C, of a ‘rim type’ specimen of Cañon Diablo. The essential feature of the new effect is the wedge-shaped area of cloudy appearance that penetrates into the cohenite from the original cohenite–kamacite interface (see Fig. 1). The figure also shows the reheated, α2, condition of the kamacite and the dark-etching zone of carbon diffusion at the cohenite–kamacite interface; effects that have often been reported in ‘rim type’ samples of Cañon Diablo1–3 and have been produced artificially by shock1 or isothermal reheating4.
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References
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Axon, H. J. & Couper, W. R. D. Mineral. Mag. 40, 827, (1976).
Buchwald, V. F. Handbook of Iron Meteorites (University of California Press, 1976).
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AXON, H., COUPER, W. & KINDER, J. New shock effects in the phosphide and carbide phases of Cañon Diablo iron meteorites. Nature 267, 414–415 (1977). https://doi.org/10.1038/267414a0
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DOI: https://doi.org/10.1038/267414a0
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