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俄罗斯雅库特乌达奇纳亚矿区含金刚石橄榄岩中的金刚石、石榴石和橄榄石中碳氢化合物的组成
Composition of Hydrocarbons in Diamonds, Garnet, and Olivine from Diamondiferous Peridotites from the Udachnaya Pipe in Yakutia, Russia
Volatile components in diamonds, associated garnet (pyrope), and olivine from two extremely rare xenoliths of diamondiferous peridotites recovered from the Udachnaya kimberlite pipe in Yakutia, Russia, were analyzed by gas chromatography–mass spectrometry (GC–MS) using a Focus DSQ II Series Single Quadrupole GC–MS (Thermo Scientific, USA). These xenoliths are pyrope lherzolite and pyrope dunite based upon compositions of coexisting minerals. Unlike the pyrope lherzolite, which contained pyrope with moderate calcium (Ca)-component content (about 15 mol%), the dunite contained subcalcic chromium (Cr)-pyrope with low Ca-component content (less than 10 mol%). All investigated minerals contained dominating hydrocarbons and their derivatives represented by aliphatic (paraffins, olefins), cyclic (naphthenes, arenes), oxygenated (alcohols, ethers), and heterocyclic (dioxanes, furans) hydrocarbons; nitrogenated, chlorinated, and sulfonated compounds; carbon dioxide (CO2); and water (H2O). The relative concentration (rel%) of total hydrocarbon was 79.7 rel% for diamonds, 69.1 rel% for garnet, and 92.6 rel% for olivine, with a general amount of components ranging from 161 to 206. New data on volatiles in diamonds, associated garnet, and olivine suggest the presence of a wide spectrum of hydrocarbons along with nitrogen (N2), CO2, and H2O in some upper mantle areas.
Diamond / Volatiles / Hydrocarbons / Pyrope / Olivine / Inclusions
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Yuri Dublyansky and an anonymous reviewer provided helpful comments and suggestions that significantly improved this manuscript. We are indebted to Dr. Ho-Kwang (Dave) Mao for the invitation to participate in Deep Volatile, Energy & Developments Summit (DVEES) 2018. This work was supported by the Russian Science Foundation (RSF-14-17-00602P); the Russian Foundation for Basic Research (RFBR-18-05-00761); and a Russian Federation State Research Subsidy.
Nikolay V. Sobolev, Anatoly A. Tomilenko, Taras A. Bul’bak, and Alla M. Logvinova declare that they have no conflict of interest or financial conflicts to disclose.
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