Origin of rapidly solidified metal-troilite grains in chondrites and iron meteorites

Details Origin of rapidly solidified metal-troilite grains in chondrites and iron meteorites Origin of rapidly solidified metal-troilite grains in chondrites and iron meteorites

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..813s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, May 1982, p. 813-823.

Computer Science

40

Chondrites, Iron Meteorites, Phase Transformations, Solidification, Troilite, Breccia, Cooling, Dendritic Crystals, Inclusions, Silicates, Meteorites, Iron Meteorites, Chondrites, Origin, Metals, Troilite, Grains, Inclusions, Texture, Ordinary Chondrites, Cooling Rate, Data, Dimmitt Meteorite, Mezo-Madaras Meteorite, Pulsora Meteorite, Analysis, San Emigdio Meteorite, Tell Meteorite, Tysnes Island Meteorite, Shock, Walters Meteorite, Weston Meteorite, Mundrabilla Meteorite, Shaw Meteorite, Nedagolla Meteori

Scientific paper

Quantitative evidence is adduced by cooling rate calculations for the impact melting, on the surface of a parent body, of troilite and metallic Fe, Ni inclusions found on 12 ordinary chondrites rather than their formation at depth from an internally derived melt. In the case of the Shaw and Rose City breccias of unmelted and melted material, their melted metal need not have cooled through 1000 C within a few meters of the surface. Shock-melted, fine-grained, irregular intergrowths of metal and troilite form in situ in many irons and some chondrites by rapid solidification at cooling rates greater than 100,000 C/sec, so that their kamacite and taenite compositions may result from annealing of metallic glass or very fine quench products at about 250 C.

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