Geology of Ore Deposits

, Volume 53, Issue 8, pp 783–791 | Cite as

Diamonds from the Poiskovaya, Zapolyarnaya, and Leningrad kimberlite pipes, Northern Yakutia: Correlation of carbon isotopic composition and nitrogen content as an indicator of fluid diamond formation

  • A. V. Ukhanov
  • G. K. Khachatryan


Compared to most studied kimberlite pipes of the Yakutian province, diamonds from the Poiskovaya, Zapolyarnaya, and Leningrad pipes (about 100 determinations) are characterized by a decrease in the average δ13C (−4.59, −4.50,−4.04‰) and by relatively low average nitrogen contents (93, 254, 304 ppm, respectively). These pipes also differ in the relative abundance of alpha-1 group crystals in Galimov’s classification. Based on a stable combination of morphology and properties, we distinguished diamond populations of the common origin. All of them have significant a negative correlation between δ13C and the nitrogen content. This correlation is considered to be a result of synchronous and progressive loss of nitrogen and the light isotope 12C in the medium during the diamond formation. The conclusion is drawn that the alpha-1 crystals were formed in the open fluid system. The pyrolysis of ethane—C2H6 → CH4 + H2 + Cdiam—is assumed to be a model of diamond precipitation from fluid. The pressure release due to extension deformation of the mantle under tectonic action might be a factor shifting this reaction toward diamond formation.


Carbon Isotopic Composition Diamond Crystal Kimberlite Pipe Nitrogen Aggregation Diamond Crystallization 
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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • A. V. Ukhanov
    • 1
  • G. K. Khachatryan
    • 2
  1. 1.Vernadsky Institute of Geochemistry and Analytical ChemistryRussian Academy of SciencesMoscowRussia
  2. 2.Central Research Institute of Geological Exploration for Base and Precious MetalsMoscowRussia

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