Abstract
This paper discusses the results of U-Pb isotopic dating of zircons from hornblendites that cut dunites of the East Khabarny dunite-clinopyroxenite-websterite-gabbro complex in the South Urals. This complex is included into the structure of the large Khabarny mafic-ultramafic allochthon, and the set of rocks and their petrogeochemical peculiarities allow this complex to be compared with the Ural-Alaskan-type complexes. Zircons from hornblendites have been dated on a SHRIMP-II ion microprobe and by the classical thermo-ionization mass spectrometric method by five fractions. The obtained results are comparable between each other within the analysis deviation interval and show that hornblendites were formed in the Early Devonian (408–402 Ma). This age is the upper geochronological limit in estimation of the time when dunites of the East Khabarny complex were formed. The synchronity of intrusive hornblendite manifestation in most of the Urals in the Early Devonian is discussed. The probable Early Devonian stage, in addition to the found Vendian and Ordovician-Silurian ones when dunite-clinopyroxenite-gabbro complexes formed in the Urals, is suggested.
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References
P. A. Balykin, E. G. Konnikov, A. P. Krivenko, et al., Petrology of Post-Harzburgite Intrusive Bodies of the Kempirsay-Khabarny Ophiolitic Association (South Urals) (UrO AN SSSR, Sverdlovsk, 1991) [in Russian].
E. Yu. Vil’danova, V. P. Zaitsev, L. I. Kravchenko, et al., Koryak-Kamchatka Region: the New Platinum-Bearing Province of Russia (VSEGEI, St. Petersburg, 2002) [in Russian].
G. R. Himmelberg and R. A. Loney, Characteristics and Petrogenesis of Alaskan-Type Ultramafic-Mafic Intrusions, Southeastern Alaska. Prof. Pap. 1564 (US Geological Survey, Washington, 1995).
A. A. Efimov and I. F. Travin, Dokl. Akad. Nauk 243, 991–994 (1978).
F. Bea, G. B. Fershtater, P. Montero, et al., Terra Nova 13, 407–412 (2001).
V. S. Popov and B. V. Belyatskii, Dokl. Akad. Nauk 409, 104–109 (2006) [Dokl. Earth Sci. 409, 795–800 (2006)].
O. V. Knauf, Vestn. SPbGU, Ser. 7., No. 4, 64–71 (2009).
K. N. Malich, A. A. Efimov, and Yu. L. Ronkin, Dokl. Akad. Nauk 427, 101–105 (2009) [Dokl. Earth Sci. 427, 851–855 (2009)].
G. B. Fershtater, A. A. Krasnobaev, F. Bea, et al., Petrologiya 17, 539–558 (2009) [Petrology 17, 503–520 (2009)].
G. B. Fershtater and E. V. Pushkarev, Izv. Akad. Nauk SSSR, Ser. Geol., no. 3, 13–23 (1987).
I. A. Gottman and E. V. Pushkarev, Litosfera, no. 2, 78–86 (2009).
E. V. Pushkarev, G. B. Fershtater, Yu. A. Kostitsin, and A. V. Travin, Yearbook 2007 (Inst. Geol. Geokhim., Yekaterinburg, 2008) [in Russian].
O. K. Ivanov and B. A. Kaleganov, Dokl. Akad. Nauk 328(6), 720–724 (1993).
I. A. Gottman and E. V. Pushkarev, Yearbook 2009 (Inst. Geol. Geokhim., Yekaterinburg, 2010) [in Russian].
J. S. Stacey and J. D. Kramers, Earth Planet. Sci. Lett. 26, 207–221 (1975).
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Original Russian Text © I.A. Gottman, E.V. Pushkarev, N.M. Kudryashov, 2011, published in Doklady Akademii Nauk, 2011, Vol. 438, No. 2, pp. 217–221.
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Gottman, I.A., Pushkarev, E.V. & Kudryashov, N.M. The upper geochronological limit for dunites of the East Khabarny gabbro-ultramafic complex (South Urals) by the data of U-Pb age of zircons extracted from vein hornblendites. Dokl. Earth Sc. 438, 593–597 (2011). https://doi.org/10.1134/S1028334X11050187
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DOI: https://doi.org/10.1134/S1028334X11050187