Abstract
It is highly possible that processes related to the injection of melts through mantle are responsible for the formation of new mineral assemblages in mantle residues (for example, zircon, olivine, Cr-spinel, and clinopyroxene). The present paper reports the results of U‐Pb zircon dating on chromite deposits and attempts to infer the timing of magmatic events in residual mantle ultramafic rocks of the Voikar‐Syninsky ophiolite massif. Ophiolite complexes of the Urals were formed during three stages of the Phanerozoic geodynamic evolution of the oceanic lithosphere: Early Ordovician spreading in the southern segment of a common Paleouralian basin; Ordovician rifting of the East European continental margin; and suprasubduction spreading in Early Devonian time, which was distinctly expressed in the polar segment of the Urals [4, 5]. At the same time, detailed studies of the geological structure of the Polar Urals, new isotope datings on the rocks of ophiolite complexes [6], and palinspastic reconstructions testify to the existence of an ancient (pre-Paleozoic) oceanic lithosphere along the margin of the East European plate [7]. Isotope datings on plutonic and dike complexes of
Published Version
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