PORPHYRITIC BITUMEN-BEARING XENOLITH WITHIN THE KRYMKA (LL3.1) CHONDRITE: 2. STRUCTURE, CHEMICAL COMPOSITION AND ORIGIN OF BITUMEN

UDC 523.681

https://doi.org/10.15407/mineraljournal.38.04.023

V.P. Semenenko, А.L. Girich
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Av., Kyiv-142, Ukraine, 03680
E-mail: cosmin@i.ua
PORPHYRITIC BITUMEN-BEARING XENOLITH WITHIN THE KRYMKA (LL3.1) CHONDRITE: 2. STRUCTURE, CHEMICAL COMPOSITION AND ORIGIN OF BITUMEN
Language: Ukrainian
Mineralogical journal 2016, 38 (4): 23-31

Abstract: The data on electron-microscopic and microprobe study of bitumen inclusions in the Krymka porphyritic xenolith are given. The bitumen is characterized by location predominantly on a surface and subsurface areas of the xenolith, amorphous state, ability to evaporation under electron beam and X-rays followed by condensation on a surface of the meteorite polished section, presence of pores and cracks, some mineral grains, areas of a fine-grained material and light bands enriched in Fe, Ni and S, variation of analytical sum in total chemical composition of different bitumen areas in the range 92.7—101.8 wt. %, and C content in the range 84.4—99.4 wt. %, presence of evidences of plastic deformation. We conclude that the bitumenbearing xenolith belongs to a fragment of porphiritic macrochondrule or other large object represented by recrystallized shock melt with similar structure. A shock-metamorphic migration nature of the bitumen caused by plural shock events in the preterrestrial history of the Krymka parent body is supposed. The bitumen could be introduced into porphyritic clast either from a fine-grained rim previously enriched in organic matter or from organic compounds accreted by the xenolith surface before the rim formation.

Keywords: meteorite, chondrite, xenolith, bitumen, minerals, fine-grained material, shock metamorphism.

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