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Statistical analysis of the groundmass composition of the diamond-bearing kimberlites of different grade in Yakutian diamondiferous province

Z.V. Spetsius1,*, A.S. Ivanov2
DOI 10.31242/2618-9712-2022-27-1-21-31

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1Diamond and Precious Metal Geology Institute SB RAS, Yakutsk, Russia
2Saint Petersburg Mine University, Saint Petersburg, Russia
*[email protected]

Received 08.11.2021
Accepted 20.01.2022

Citation
Spetsius Z.V., Ivanov A.S. Statistical analysis of the groundmass composition of the diamond-bearing kimberlites of different grade in Yakutian diamondiferous province // Arctic and Subarctic Natural Resources. 2022, Vol. 27, No. 1. P. 21–31. (In Russ.) https://doi.org/10.31242/2618-9712-2022-27-1-21-31

Abstract. The chemical composition of kimberlites is essential for the identification of the origin and assessment of their potential diamond content. We have studied 42 major and trace elements in more than 100 samples from the bulk groundmass of kimberlite pipes of the Yakutian diamondiferous province. The procedures were performed using the ICPMS spectrometer iCAP 6300 Duo. The data on composition of the groundmass of kimberlites was processed by traditional statistical methods. Based on the analysis results, we have identified seven groups of mineral-forming elements. For a kimberlite pipe with a known diamond content, we proposed to select coefficients in order to construct histograms of the same size. Thus, the percentage values of the seven groups of mineral-forming elements serves as a benchmark. We demonstrated that the chemistry of the bulk groundmass of kimberlites is specific to each kimberlite pipe and can be used to assess their potential diamond grade.

Keywords: kimberlites, ground mass, chemical composition, statistical analysis, diamond grade, Yakutian diamondiferous province.

Acknowledgements. The authors express gratitude to all the colleagues participated in the implementation of the laboratory and analytical work of the studies. The main part of the research was carried out within the scientific research at the Geo-Scientific Enterprise, ALROSA OJSC.


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