Character of zircon distribution in dunites of the South Urals (Sakharin and East Khabarnin massifs)

Zircons in dunites of the Sakharin and East Khararnin massifs, situated in the South Urals and part of the platinum-bearing Uralian belt, were investigated for the first time. Several types were identified in the polygene-polychronous zircon assemblage of both massifs. The first is represented by Pr...

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Published in:Doklady earth sciences 2009-06, Vol.426 (1), p.685-689
Main Authors: Krasnobaev, A. A., Fershtater, G. B., Busharina, S. V.
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Language:English
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Crystals
Earth and Environmental Science
Earth Sciences
Geochemistry
Magma
Stratigraphy
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description Zircons in dunites of the Sakharin and East Khararnin massifs, situated in the South Urals and part of the platinum-bearing Uralian belt, were investigated for the first time. Several types were identified in the polygene-polychronous zircon assemblage of both massifs. The first is represented by Proterozoic (from 1517 ± 12 to 2693 ± 9 Ma) crystals similar to those widely spread in the Riphean and more ancient Uralian deposits. The second type includes dunite varieties of typical magmatic habit and of ages from 377 ± 3.6 Ma to 402 ± 3 Ma. The third contains crystals and crystal fragments of a high degree of crystallinity. The concordant Archean dating (2808 ± 26 Ma) for zircons of this type determines the minimum age of the dunite substrate. Zircons of Type 4 are heterogeneous, consist of the relict (nuclear) part represented by crystals of Types I and III and the newly formed mantle, and are consistent with zircons of Type II.
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subjects Crystals
Earth and Environmental Science
Earth Sciences
Geochemistry
Magma
Stratigraphy
title Character of zircon distribution in dunites of the South Urals (Sakharin and East Khabarnin massifs)
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