Evidence of shock metamorphism in the Kaali meteorite.
Abstract
Microscopic, electron-microscopic, and X-ray spectral data indicate the basic differences of composition and structure between samples of the Kaali meteorite that were changed by shock metamorphism and samples of this meteorite that were not changed by shock metamorphism. Samples of the meteorites that underwent shock metamorphism during the fall to earth disclose the presence of deformation structures (the bending of taenite streaks and the jointing of schreibersite) as well as signs of shock heating and melting (changes in the structure of plessite in the taenite streaks, the appearance of silicon in the metallic phases, and the appearance of metal stratification structures). It is suggested that, under shock metamorphism, the meteorite was heated to temperatures above 600 C but below 850 C.
- Publication:
-
Meteoritika
- Pub Date:
- 1982
- Bibcode:
- 1982Metik..41...96S
- Keywords:
-
- Impact Melts;
- Iron Meteorites;
- Metamorphism (Geology);
- Meteoritic Composition;
- Shock Heating;
- Chemical Composition;
- Crystal Defects;
- Kamacite;
- Meteoritic Microstructures;
- Mineralogy;
- Nickel Compounds;
- Schreibersite;
- Lunar and Planetary Exploration;
- Meteorites:Structure