MINERALOGY OF A UNIQUE GRAPHITE-CONTAINING FRAGMENT IN THE KRYMKA CHONDRITE (LL3)
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dc.contributor.author | Semenenko V.P. | |
dc.contributor.author | Girich A.L. | |
dc.date.accessioned | 2020-12-06T07:15:22Z | |
dc.date.available | 2020-12-06T07:15:22Z | |
dc.date.issued | 1995 | |
dc.identifier | https://elibrary.ru/item.asp?id=38770752 | |
dc.identifier.citation | Mineralogical Magazine, 1995, , 3, 443-454 | |
dc.identifier.issn | 0026-461X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20560 | |
dc.description.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. | |
dc.title | MINERALOGY OF A UNIQUE GRAPHITE-CONTAINING FRAGMENT IN THE KRYMKA CHONDRITE (LL3) | |
dc.type | Статья |
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