FeNi metal in impact melt rocks of Lake Lappajärvi, Finland

Details FeNi metal in impact melt rocks of Lake Lappajärvi, Finland FeNi metal in impact melt rocks of Lake Lappajärvi, Finland

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976comp...55..255f&link_type=abstract

Contributions to Mineralogy and Petrology, Volume 55, Issue 3, pp.255-263

Computer Science

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Scientific paper

Particles of FeNi metal ranging in size from a few νmto 0.1 mm in diameter are a distinctive feature of the shock-generated melt rocks of Lake Lappajärvi. Irondeficient iron sulphide, pyrrhotite, is nearly always associated with the metal. Accessory phases are FeNiCo-sulphides, a phosphorus-bearing mineral (probably apatite), iron-rich aluminosilicates, and ilmenite. The content of Ni in the metal varies from less than 2% to more than 10%. There is evidence that the iron formed from molten globules which crystallized slowly and adjusted to low temperatures by solid state diffusion. The Ni concentration in the largest metal particles which appear to be least affected by alteration processes, and hence may represent the composition of the parent metal phase of the projectile, is, however, lower than in any reported meteoritic iron.

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