Zirconium and hafnium fractionation in differentiation of alkali carbonatite magmatic systems

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• 作者：L. N. Kogarko
• 刊名：Geology of Ore Deposits
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：58
• 期：3
• 页码：173-181
• 全文大小：844 KB
• 刊物主题：Mineral Resources;
• 出版者：Springer US
• ISSN：1555-6476
• 卷排序：58

文摘

Zirconium and hafnium are valuable strategic metals which are in high demand in industry. The Zr and Hf contents are elevated in the final products of magmatic differentiation of alkali carbonatite rocks in the Polar Siberia region (Guli Complex) and Ukraine (Chernigov Massif). Early pyroxene fractionation led to an increase in the Zr/Hf ratio in the evolution of the ultramafic–alkali magmatic system due to a higher distribution coefficient of Hf in pyroxene with respect to Zr. The Rayleigh equation was used to calculate a quantitative model of variation in the Zr/Hf ratio in the development of the Guli magmatic system. Alkali carbonatite rocks originated from rare element-rich mantle reservoirs, in particular, the metasomatized mantle. Carbonated mantle xenoliths are characterized by a high Zr/Hf ratio due to clinopyroxene development during metasomatic replacement of orthopyroxene by carbonate fluid melt.Original Russian Text © L.N. Kogarko, 2016, published in Geologiya Rudnykh Mestorozhdenii, 2016, Vol. 58, No. 3, pp. 197–205.