COMPOSITION, STRUCTURE, AND CONDITIONS OF CRYSTALLIZATION OF IRON METEORITES,
Abstract
Phase composition of iron meteorites is explained by phase diagram of complex Fe-Ni-Co-P-S system. Composition and relationship of phases of meteoritic iron in first approximation are explained by phase diagram of Fe-Ni system. Ambiguous connection between structure and composition of iron meteorites (nickel content) testifies to difference of conditions of their recrystallization. Iron meteorites consist of four groups, differing in content of small impurities of gallium and germanium, recrystallization of which occurred under different conditions. Experimental data on nonuniform composition of separate phases of meteoritic iron (taenite, kamacite, schreibersite, rhabdite, and troilite) attest to absence of equilibrium conditions of its crystallization both at comparatively low and at higher temperatures. This conclusion is confirmed by results of investigation of relationship of phases and study of structure iron meteorites. Considering exceptionally large size of crystals of alpha-and gamma-phases in iron meteorites, conditions of formation of meteoritic iron can be considered quasi-equilibrium. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 28, 1964
- Accession Number
- AD0603398
Entities
People
- A. A. Yavnel'
Organizations
- National Air and Space Intelligence Center