Electron microprobe analysis of terrestrial and meteoritic cohenite

Details Electron microprobe analysis of terrestrial and meteoritic cohenite Electron microprobe analysis of terrestrial and meteoritic cohenite

Oct 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28.1745l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 10-11, pp.1745-1748

Physics

3

Scientific paper

Cohenite (FeNi) 3 C occurs in metallic masses found in basaltic rocks at Uivfaq, Disko Island, West Greenland. Electron microprobe studies have shown that the large cohenite grains up to 0.5 mm across contain about 0.60 per cent nickel while narrow plates of cohenite around 20 across contain up to 3.14 per cent nickel. Cohenite from the Coolac coarse octahedrite contains 1.34 per cent nickel. The existence of terrestrial cohenite in nickel-iron metallic masses in coarse grained basaltic flows or very shallow intrusions would suggest that cohenite can form and be preserved in a relatively slowly cooling, low pressure environment. It follows that meteoritic cohenite can no longer be considered an unequivocal "high pressure indicator" in the iron meteorites.

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