Electron microprobe study of metal particles in the Kingfisher meteorite

Details Electron microprobe study of metal particles in the Kingfisher meteorite Electron microprobe study of metal particles in the Kingfisher meteorite

Jun 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34..677t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 34, Issue 6, pp.677-678

Computer Science

4

Scientific paper

Ni, Fe and P contents were determined with an electon microprobe in five metal particles of the Kingfisher chondrite. These particles show microstructures which can best be described as very coarse plessites. The results indicate that the microstructures were formed by the transformation of preexisting 2 -phase. In the case of Kingfisher the transformation occurred when the meteorite was reheated by shock, some 500 m.y. ago. Most of the 2 -phase was then transformed at about 600°C. If this is taken to be the residual temperature of the silicates, the shock pressure was at least 0.5 Mb. The evidence suggests that the 2 decomposition was completed at about 450°C. The grain size of the taenite seems to imply rather slow cooling after the shock; at least some tens of years at 600°C are required for the largest grains.

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