New shock effects in the phosphide and carbide phases of Cañon Diablo iron meteorites
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.
- Publication:
-
Nature
- Pub Date:
- June 1977
- DOI:
- 10.1038/267414a0
- Bibcode:
- 1977Natur.267..414A
- Keywords:
-
- Iron Meteorites;
- Metamorphism (Geology);
- Meteoritic Microstructures;
- Carbides;
- Geochemistry;
- Mechanical Shock;
- Phosphides;
- Lunar and Planetary Exploration