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Doklady Earth Sciences

, Volume 482, Issue 1, pp 1165–1167 | Cite as

Geochemistry and Fractionation of Zr and Hf in the Magmatic System of the Kugda Massif (Polar Siberia)

  • L. N. Kogarko
Geochemistry
  • 9 Downloads

Abstract

The patterns of the distribution and fractionation of strategic metals (Zr, Hf) in the Kugda intrusion (Polar Siberia) have been studied. The contents of these elements significantly exceed their concentrations in other rocks (Zr, 246 ppm; Hf, 7.4 ppm). A significant increase in Zr and Hf from early rocks (olivinite and melilite rocks) to later differentiation products, syenites with up to 570 ppm of Zr and 16 ppm of Hf, has been revealed. During the evolution of the Kuga magmatic system, notable fractionation of Zr and Hf occurred. The Zr/Hf ratios in the dyke rock, similar in composition to the primary Kugda Massif magma, and the early intrusions are fairly close to that of chondrite (Zr/Hf = 37 [1]), while in the latest phases this ratio increases by almost 5-fold.

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References

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    W. F. McDonough and S. Sun, Chem. Geol. 120, 223–253 (1995).CrossRefGoogle Scholar
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    L. S. Egorov, Ijolite-Carbonatite Plutonism (by the Example of the Maimecha-Kotui Complex in Polar Siberia (Nedra, Leningrad, 1991) [in Russian].Google Scholar
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    L. N. Kogarko, Geochem. Int. 54 (1), 1–6 (2016).CrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Vernadsky Institute of Geochemistry and Analytical ChemistryMoscowRussia

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