| Инд. авторы: | Sitnikova E.S., Shatsky V.S. |
| Заглавие: | New FTIR spectroscopy data on the composition of the medium of diamond crystallization in metamorphic rocks of the Kokchetav Massif |
| Библ. ссылка: | Sitnikova E.S., Shatsky V.S. New FTIR spectroscopy data on the composition of the medium of diamond crystallization in metamorphic rocks of the Kokchetav Massif // Russian Geology and Geophysics. - 2009. - Vol.50. - Iss. 10. - P.842-849. - ISSN 1068-7971. - EISSN 1878-030X. |
| Внешние системы: | DOI: 10.1016/j.rgg.2009.09.002; SCOPUS: 2-s2.0-69949090460; |
| Реферат: | eng: 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. © 2009.
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| Ключевые слова: | Northern Kazakhstan; chemical composition; crystallization; diamond; fluid inclusion; FTIR spectroscopy; metamorphic rock; nitrogen; West Asia; Kokchetav Massif; Kazakhstan; Eurasia; Asia; morphology; microinclusions; Kokchetav; nitrogen impurity; diamond; |
| Издано: | 2009 |
| Физ. характеристика: | с.842-849 |