Fractionation of zirconium and hafnium during processes of mantle metasomatism
- Authors: Kogarko L.N.1
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Affiliations:
- Vernadsky Institute of Geochemistry and Analytic Chemistry
- Issue: Vol 468, No 2 (2016)
- Pages: 598-601
- Section: Geochemistry
- URL: https://ogarev-online.ru/1028-334X/article/view/188514
- DOI: https://doi.org/10.1134/S1028334X16060076
- ID: 188514
Cite item
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.
About the authors
L. N. Kogarko
Vernadsky Institute of Geochemistry and Analytic Chemistry
Author for correspondence.
Email: kogarko@geokhi.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991
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