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Features of the Impurity Composition of Diamonds from Placers of the Northeastern Siberian Craton

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Abstract

Diamond crystals from the Istok (25 crystals) and Mayat (49 crystals) placers were studied using the EPR, IR, and luminescence methods. The total content of impurity nitrogen in forms of A, B, and C (P1) centers ranges from 50 to 1200 ppm. According to the EPR spectroscopy, the presence of nitrogen C (P1), N3V and nitrogen-titanium OK1, N3, NU1 impurity centers was established in the investigated crystals. For 18 crystals from the Istok placer, the N3 nitrogen-titanium center was observed in the EPR spectra, but in the luminescence spectra there was no 440.3 nm system, which was previously attributed to the manifestation of the N3 defect. It is more likely that the nitrogen-titanium N3 EPR center corresponds to the electron-vibrational system 635.7 nm, which is observed in the luminescence spectra of these crystals. Crystals from the Istok placer contain the OK1, N3, and NU1 centers, but luminescence attributed to the oxygen-containing centers is absent in the region of 610–670 nm. For the Mayat placer crystals, the reverse situation was observed. The luminescence ascribed to the oxygen-containing centers was detected for 17 crystals, but there were no OK1, N3, and NU1 centers according to the EPR and luminescence. This result contradicts the arguments of a number of authors about the oxygen nature of these defects. For 5 crystals from the Mayat placer, the nickel impurity was registered. This indicates the presence of ultrabasic paragenesis diamond crystals in this placer.

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This work has been performed under the program of fundamental research SB RAS (0300-2018-0023).

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Correspondence to V. A. Nadolinny.

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Shatsky, V.S., Nadolinny, V.A., Yuryeva, O.P. et al. Features of the Impurity Composition of Diamonds from Placers of the Northeastern Siberian Craton. Dokl. Earth Sc. 486, 644–646 (2019). https://doi.org/10.1134/S1028334X19060096

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  • DOI: https://doi.org/10.1134/S1028334X19060096

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