Journal
RUSSIAN GEOLOGY AND GEOPHYSICS
Volume 50, Issue 10, Pages 842-849Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.rgg.2009.09.002
Keywords
diamond; nitrogen impurity; microinclusions; morphology; Kokchetav; Northern Kazakhstan
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A representative sample of microdiamonds in calc-silicate and garnet-pyroxene-quartz rocks and gneisses from the cross section of an adit driven at the Kumdy-Kol' deposit (Northern Kazakhstan) has been analyzed. Microdiamonds from these rocks were studied by Fourier-transform infrared spectroscopy for the first time. It has been established that nitrogen impurity content (300-3000 ppm) and nitrogen aggregation degree (14-75%) vary widely and do not correlate with each other. The variation is probably due to the uneven distribution of nitrogen in crystals and to their specific internal structures. The results of the study show that in most diamondiferous rocks, diamonds crystallized from a fluid/melt of composition varying between aqueous-carbonate and aqueous-silicate end-members. Spectroscopy studies partly disagree with literature data on individual nanoinclusions in diamonds. The cause of this discrepancy may be the evolution of the fluid/melt during diamond crystallization. (C) 2009, IGM, Siberian Branch of the RAS. Published by Elsevier B. V. All rights reserved.
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