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Radial mosaic internal structure of rounded diamond crystals from alluvial placers of Siberian platform

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Abstract

The specific gray to almost black diamonds of rounded morphology are especially typical in alluvial placers of the northeastern part of the Siberian platform. The results of study of internal structure of these diamonds are presented. X-ray topography and birefringence patterns of polished plates of studied diamonds show their radial mosaic structure. Diamonds consists of slightly misorientated (up to 20′) subindividuals which are combined to mosaic wedge-shaped sectors. Electron back-scatter diffraction technique has demonstrated that subindividuals are often combined in the single large blocks (subgrains). The whole crystals commonly consist of several large subgrains misoriented up to 5° to one another. The total nitrogen content of these diamonds vary in the range 900–3300 ppm and nitrogen aggregation state (NB/(NB + NA)*100) from 25 to 64 %. Rounded diamond crystals of variety V are suggested to have been formed at the high growth rate caused by the high oversaturation of carbon in the crystallization medium. It may result in the splitting of growing crystal and their radial mosaic structure as a sequence. High content of structural nitrogen defects and the great number of mechanical impurities – various mineral and fluid inclusions may also favor to generation of this structure.

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Acknowledgments

This study was supported by the Russian Science Foundation under Grant No. 14-27-00054. The manuscript benefited from the constructive comments by Felix V. Kaminsky, an anonymous reviewer, and handling editor Dogan Paktunc.

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  1. V. S. Sobolev Institute of Geology and Mineralogy, Siberian Branch Russian Academy of Sciences, Novosibirsk, Russia

    A. L. Ragozin, D. A. Zedgenizov & V. S. Shatsky

  2. Novosibirsk State University, Novosibirsk, Russia

    A. L. Ragozin, D. A. Zedgenizov & V. S. Shatsky

  3. Budker Institute of Nuclear Physics, Siberian Branch Russian Academy of Sciences, Novosibirsk, Russia

    K. E. Kuper

  4. A. P. Vinogradov Institute of Geochemistry, Siberian Branch Russian Academy of Sciences, Irkutsk, Russia

    V. S. Shatsky

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Ragozin, A.L., Zedgenizov, D.A., Kuper, K.E. et al. Radial mosaic internal structure of rounded diamond crystals from alluvial placers of Siberian platform. Miner Petrol 110, 861–875 (2016). https://doi.org/10.1007/s00710-016-0456-0

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