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A metallographic and microprobe study of the Barranca Blanca meteorite

Published online by Cambridge University Press:  05 July 2018

H. J. Axon  and
D. Faulkner
H. J. Axon
Affiliation:
Metallurgy Department, The University, Manchester M13 9PL
D. Faulkner
Affiliation:
Metallurgy Department, The University, Manchester M13 9PL
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Summary

The distribution of kamacite, taenite, and plessite suggests that kamacite nucleated at the sulphides, which appear to have been plentifully dispersed in the parent taenite. Such a process could take place without the undercooling that is usually assumed in normal octahedrites. The plessite fields show internal boundaries that are probably relics of grain boundaries in the parent taenitesulphide aggregate. Microprobe investigations have been made of nickel distributions in and between kamacite, taenite, plessite, and schreibersite, and particular attention has been paid to the nickel distribution at the internal grain boundaries in the plessite. Evidence is presented for the diffusion of nickel along these boundaries and for their migration during the later stages of formation of the microstructure.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 292 , December 1970 , pp. 898 - 904
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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References

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