Browsing by Author "Verchovsky A.B."
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Browsing by Author "Verchovsky A.B."
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Fisenko A.V.; Semjonova L.F.; Verchovsky A.B.; Pillinger C.T. (2004)The origin of diamond in ureilites is still debating. There are two the most popular explanations: (1) as a result of shock transformation from graphite caused by meteorite impact in the parent bodies [1-4], and (2) in a ...
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Rubin A.E.; Kallemeyn G.W.; Wasson J.T.; Clayton R.N.; Mayeda T.K.; Grady M.; Verchovsky A.B.; Eugster O.; Lorenzetti S. (2003)Gujba is a coarse-grained meteorite fall composed of 41 vol% large kamacite globules, 20 vol% large light-colored silicate globules with cryptocrystalline, barred pyroxene and barred olivine textures, 39 vol% dark-colored, ...
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Sephton M.A.; Love G.D.; Watson J.S.; Verchovsky A.B.; Wright I.P.; Snape C.E.; Gilmour I. (2004)The major organic component of carbonaceous chondrites is a solvent-insoluble, high molecular weight macromolecular material that constitutes at least 70% of the total organic content in these meteorites. Analytical pyrolysis ...
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Verchovsky A.B.; Ott U.; Begemann F. (1993)Noble gases were extracted in steps from grain size fractions of microdiamonds (less than 100 microns) from the Kokchetav Massif, Northern Kazakhstan, by pyrolysis and combustion. The concentration of He-4 in the diamonds ...
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Sephton M.A.; Verchovsky A.B.; Bland P.A.; Gilmour I.; Grady M.M.; Wright I.P. (2003)The carbonaceous chondrites contain significant amounts of carbon- and nitrogen-bearing components, the most abundant of which is organic matter. Stepped combustion data of whole rock and HF/HCl residues of carbonaceous ...
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LIGHT ELEMENT GEOCHEMISTRY OF THE TAGISH LAKE C12 CHONDRITE: COMPARISON WITH CI1 AND CM2 METEORITES Grady M.M.; Verchovsky A.B.; Franchi I.A.; Wright I.P.; Pillinger C.T. (2002)We have studied the carbon and nitrogen stable isotope geochemistry of a small pristine sample of the Tagish Lake carbonaceous chondrite by high-resolution stepped-combustion mass spectrometry, and compared the results ...
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Assonov S.S.; Franchi I.A.; Pillinger C.T.; Semenova A.S.; Shukolyukov Yu.A.; Verchovsky A.B.; Iassevitch A.N. (2002)Fines, microbreccias and agglutinates from the Luna 16 mature regolith 1635 and fines from the immature/submature Luna 24 regolith have been analysed for N and argon isotopes in order to understand the origin of isotopically ...
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Fisenko A.V.; Semenova L.F.; Verchovsky A.B.; Pillinger K.T. (2004)Presolar diamond recovered from the Boriskino CM2 meteorite was separated into size fractions by sedimentation in an ultracentrifuge. The average grain sizes of the fractions ranged from ~1.4 to ~5.3 nm. Noble gases were ...
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Verchovsky A.B.; Sephton M.A.; Wright I.P.; Pillinger C.T. (2002)The exact location of planetary noble gases in meteorites remains unknown but it is inferred to be closely associated with, if not precisely some portion of, the macromolecular organic material in carbonaceous chondrites ...
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Shelkov D.A.; Verchovsky A.B.; Milledge H.J.; Pillinger C.T. (1998)We have investigated variations of 4He content in the different zones of single natural diamond crystals using a step combustion technique. The results indicate that some diamonds may be strongly irradiated during their ...
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