![]() Mineral Resour Ukraine 3:30–32 (in Russian) Gurov EP, Gurova EP, Sokur TM (1999) Impact diamonds in the rocks of the Western astrobleme. Abstr Lunar and Planetary Sci Conf XXIII 1:413–414 Gilmour I, Russel SS, Pillinger CT, Lee M, Arden JW (1992a) Origin of microdiamonds in KT boundary clays. Gilmour I, Russell SS, Arden JW, Lee MR, Franchi IA, Pillinger CT (1992b) Terrestrial carbon and nitrogen isotopic ratios from Cretaceous-Tertiary boundary nanodiamonds. Galimov EM, Kaminsky FV, Ivanovskaya IN (1978) Study of the isotopic composition of carbon in diamonds from the Urals, Timan, Sayan, Ukraine and other regions. Comprehensive Diamond Res Moscow 153:19–29 (in Russian) Galimov EM, Ivanovskaya IN, Kaminsky FV, Sobolev NV, Gritsik VV, Zezin RB, Lukyanovich MV, Klyuev YuA (1980) New data on the carbon isotopic composition of diamonds from various regions of the Soviet Union. Galimov EM (1984) Variations of the isotopic composition of diamonds and their relationship with the conditions of diamond formation. J Russian Phys Chem Soc 20:185–213 (in Russian)įoote AE (1891) A new locality for meteoric iron with a preliminary notice of the discovery of diamonds in the iron. 35–36Įrofeev MV, Lachinov PA (1888) About the Novo-Urey meteorite. Twenty-Sixth micro-symposium on comparative planetology. Nature 291(5814):396–398Įremenko GK, Valter AA, Kvasnitsa VN (1997) Cubic impact diamond: structure, natural etching, origin. Nature 352:708–709Ĭlarke RS, Appelman DE, Ross PB (1981) An Antarctic iron meteorite contains pre-terrestrial impact-produced diamonds and lonsdaleite. Nature 357:119–120Ĭarlisle DB, Braman DR (1991) Nanometre-size diamonds in the Cretaceous/Tertiary boundary clay of Alberta. The location of the source rocks and potential routes how diamond have been incorporated into the Samotkan’ placer are discussed.Ĭarlisle DB (1992) Diamonds at the K/T boundary. The photo luminescent and spectroscopic features of the studied diamonds indicate the absence of nitrogen defects in crystals that are characteristic for mantle diamond. ![]() ![]() The carbon isotopic composition of impact diamonds ranges: for Bilylivka diamonds – from –14.80 to –21.84 ‰ δ 13C VPDB, with an average value of –17.21 ‰ δ 13C and for Samotkan’ diamonds – from –10.35 to –23.06 ‰ δ 13C VPDB, with an average value of –17.64 ‰ δ 13C. Microstructural features of the graphite-diamond transition in the studied crystals of impact diamonds are their polysynthetic (11 \(\overline\) 1) twinning and the polycrystalline structure of the twins themselves. They show external morphological and internal microstructural features of solid-state phase transition of graphite to diamond during impact shock metamorphism – they are paramorphoses on graphite crystals. Impact diamond crystals are mostly two- or three-phase polycrystalline aggregates (diamond, lonsdaleite, graphite). The size of the impact diamonds is up to 0.5 mm. The results of a comprehensive study of impact diamond crystals - morphology, microtopography, microstructure, carbon isotope composition, photoluminescence, optical, infrared, and Raman spectroscopy - are presented. In this work impact diamonds from the Bilylivka meteorite crater and from the Samotkan’ Neogene titanium-zirconium placer were studied in detail. There are seven meteorite craters and several Neogene placers in the Ukrainian Shield containing impact apographitic diamond. ![]()
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