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Polychronous formation of mantle complexes in ophiolites

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Abstract

The paper presents new determinations of the U-Pb zircon age of high-Al chromitite from dunite of the mantle section of the Voikar-Synya massif at the Kershor site in the boundary zone with rocks of the dunite-wehrlite-clinopyroxenite complex. The high-Cr chromitite from dunite in the central part of the same massif contains zircon dated at ca. 0.6 Ga [10]. It is suggested that Paleoproterozoic (2.0−1.9 Ga) zircons from chromitites of the mantle section near the petrological Moho boundary were formed in the course of partial melting of peridotites and/or their interaction with migrating MORB-type melts. The occurrence of Vendian and Paleoproterozoic zircons in chromitites from different parts of the mantle section, as well as previously published petrological, geochemical, and geological data [2, 11, 22] allow us to suggest a complex multistage evolution of the mantle section in ophiolites. The arguments stated below show that chromitites and host dunites could have been formed at different times and were probably related to different processes. Thus, not only various complexes of the pre-Paleozoic oceanic crust reworked in the suprasubduction setting differ in age, but also the mantle rock of similar petrography, vary in the time of their formation.

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Authors and Affiliations

  1. Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia

    G. N. Savelieva

  2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia

    V. G. Batanova, A. V. Sobolev & I. A. Belousov

  3. ISTerre, Université Joseph Fourier 1, Grenoble, BP 53, 38041, Grenoble Cedex 9, France

    V. G. Batanova & A. V. Sobolev

  4. Center of Isotopic Research, Russian Geological Research Institute, Srednii prosp. 74, St. Petersburg, 199106, Russia

    N. A. Berezhnaya & S. L. Presnyakov

  5. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia

    S. G. Skublov

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  1. G. N. Savelieva
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  7. I. A. Belousov
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Correspondence to G. N. Savelieva.

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Original Russian Text © G.N. Savelieva, V.G. Batanova, N.A. Berezhnaya, S.L. Presnyakov, A.V. Sobolev, S.G. Skublov, I.A. Belousov, 2013, published in Geotektonika, 2013, Vol. 47, No. 3, pp. 43–57.

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Savelieva, G.N., Batanova, V.G., Berezhnaya, N.A. et al. Polychronous formation of mantle complexes in ophiolites. Geotecton. 47, 167–179 (2013). https://doi.org/10.1134/S0016852113030060

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