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A metallographic study of the iron meteorite Verkhne Dnieprovsk, BM 51183

Published online by Cambridge University Press:  05 July 2018

A. W. R. Bevan ,
J. Kinder  and
H. J. Axon
A. W. R. Bevan
Affiliation:
Mineralogy Department, British Museum (Nat. Hist.), London
J. Kinder
Affiliation:
Metallurgy Department, The University, Manchester
H. J. Axon
Affiliation:
Metallurgy Department, The University, Manchester
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Summary

The Verkhne Dnieprovsk material (BM 51183) in the collection of the British Museum (Nat. Hist.) is chemically group IIE and therefore distinct from Augustinovka. Structurally it is a finest octahedrite, with a kamacite band-width (0.05 mm) and bulk Ni content (Scott and Wasson, 1976) appropriate to a cooling rate of 830 K Myr−1. Subsequent pre-terrestrial shock has produced localized deformation and shock-heating effects, which include mm-size globules of metal-phosphide melt product with a dendritic texture indicating resolidification at c.10 000 K sec−1. It is suggested that the phosphides were already fissured at the time of shockmelting. The structure of Verkhne Dnieprovsk, although lacking silicates, is analogous to that of Kodaikanal.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 325 , March 1979 , pp. 149 - 154
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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