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Mineralogy of a unique graphite-containing fragment in the Krymka chondrite (LL3)

Published online by Cambridge University Press:  05 July 2018

V. P. Semenenko  and
A. L. Girich
V. P. Semenenko
Affiliation:
Institute of Geochemistry, Mineralogy and Ore Formation National Academy of Sciences of Ukraine, Paladin-34, Kiev-142, Ukraine Museum National d'Histoire Naturelle, Paris, France
A. L. Girich
Affiliation:
Institute of Geochemistry, Mineralogy and Ore Formation National Academy of Sciences of Ukraine, Paladin-34, Kiev-142, Ukraine
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Abstract

The Krymka chondrite contains an exotic graphite-bearing fragment that appears to be of a new type of material added to unequilibrated LL-chondrite during agglomeration on the surface of the parent body. The fine-granular texture without chondrules, two morphological groups of graphite crystals which differ in size and occurence, high content of troilite (11.3 vol.%), the high Ni (55.5–66.6 wt.%) and Co (1.59–2.87 wt.%) contents of the taenite and absence of kamacite, the presence of F-apatite, which is rare for meteorites but common for lunar and terrestrial igneous rocks, are the main features of the fragment.

The mineralogy and texture indicate: (1) the fragment probably formed by crystallization from a highly reduced silicate melt, which had been enriched in carbon; 2) the subsequent metal sulphidization lowered its abundance and resulted in the formation of troilite and the compositional features of the residual metal; (3) terrestrial weathering of an exotic fragment and the host part of the chondrite produced iron hydroxides, pentlandite and quite possibly magnetite.

Keywords

chondritefragmentgraphitefiliform crystals
Type
Mineralogy
Information
Mineralogical Magazine , Volume 59 , Issue 396 , September 1995 , pp. 443 - 454
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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