Abstract
For the first time, fractionation of zirconium and hafnium in carbonatized mantle xenoliths from the eastern Antarctic has been studied. An elevation relative to the chondrite values of Zr/Hf in the metasomatized xenoliths has been revealed. The main reactions of the carbonate metasomatism lead to replacement of primary orthopyroxene by secondary clinopyroxene. A substantial broadening of the clinopyroxene crystallization field results in an increase of Zr/Hf in an equilibrated melt due to a higher partition coefficient of Hf in clinopyroxene, relative to that of Zr. Migration of reaction-active carbonate and carbonate–silicate melts, equilibrated to metasomatic wehrlite, causes an increase in the Zr/Hf value in the carbonatized mantle substrate.
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Original Russian Text © L.N. Kogarko, 2016, published in Doklady Akademii Nauk, 2016, Vol. 468, No. 4, pp. 447–450.
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Kogarko, L.N. Fractionation of zirconium and hafnium during processes of mantle metasomatism. Dokl. Earth Sc. 468, 598–601 (2016). https://doi.org/10.1134/S1028334X16060076
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DOI: https://doi.org/10.1134/S1028334X16060076