Abstract
First U-Pb zircon isotopic dates were obtained for rocks from the Devonian volcanic belt in Kazakhstan. The granodiorites of the Zhabden Massif (Karamendinskii Complex) were dated at 391 ± 1 Ma. The Sm-Nd isotopic system of a whole-rock granodiorite sample (ɛNd = 2.5) suggests a high percentage of mantle material in the initial granite melt, which is in good agreement with known data on granitoids in neighboring territories in Kazakhstan. With regard for the isotopic dates obtained for the granodiorites, the material of their source was separated from the mantle at 946 Ma.
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References
A. A. Bogdanov, “Main Features of Paleozoic Structures in Central Kazakhstan,” Byull. Mosk. O-va Ispyt. Prir., Otd. Geol. 39(1), 3–38 (1959).
A. A. Bogdanov, “Tectonic Subdivision of Paleozoides of Central Kazakhstan and the Tien Shan,” Byull. Mosk. O-va Ispyt. Prir., Otd. Geol. 40(6), 8–42 (1965).
P. V. Ermolov and E. G. Mal’chenko, “Nd-Sm Isotope Composition of the Akchatau Intrusive Complex,” Geol. Okhr. Nedr Kazakhstana, No. 2 (7), 36–38 (2003).
Geological Map of Kazakhstan, Scale 1: 500000. Central-Kazakhstan Series. Explanatory Note (Alma-Ata, 1981) [in Russian].
Geological Structure of Kazakhstan (Akad. Mineral. Res. Resp. Kazakhs., Almaty, 2000) [in Russian].
T. E. Krogh, “A Low-Contamination Method for Hydrothermal Decomposition of Zircon and Extraction of U and Pb for Isotopic Age Determination,” Geochim. Cosmochim. Acta 37, 485–494 (1973).
T. E. Krogh, “Improved Accuracy of U-Pb Zircon by the Creation of More Concordant Systems Using an Air Abrasion Technique,” Geochim. Cosmochim. Acta 46, 637–649 (1982).
A. M. Kurchavov, K. N. Shatagin, and E. V. Negrei, “Petrogenetic and Geochemical Significance of the Rb-Sr and Sm-Nd Isotope Studies of Upper Paleozoic Magmatic Rocks of Central Kazakhstan,” in Proceedings of 2nd All-Russia Petrographic Conference on Petrography on the Turn of 21st Century (Syktyvkar, 2000), Vol. 2, pp. 55–57 [in Russian].
K. R. Ludwig, “ISOPLOT/Ex. Version 2.06. A Geochronological Toolkit for Microsoft Excel,” Berkley Geochronology Center Sp. Publ., No. 1a (1999).
K. R. Ludwig, “PbDat for MS-DOS, Version 1.21,” U.S. Geol. Survey Open-File Rept., No. 88-542 (1991).
E. G. Mal’chenko and M. S. Grankin, “Age of the Intrusive Complexes of the Devonian Volcanoplutonic Belt,” Geol. Razv. Nedr Kazakhstana, No. 1, 7–10 (1966).
J. M. Mattinson, “A Study of Complex Discordance in Zircons Using Step-Wise Dissolution Techniques,” Contrib. Mineral. Petrol. 116, 117–129 (1994).
L. A. Neymark, V. P. Kovach, A. A. Nemchin, et al., “Late Archean Intrusive Complexes in the Olekma Granite-Greenstone Terrane (Eastern Siberia): Geochemical and Isotopic Study,” Precambrian Res. 62(4), 453–472 (1993).
K. N. Shatagin, K. E. Degtyarev, V. N. Golubev, et al., “Vertical and Lateral Heterogeneity of the Crust beneath Northern Kazakhstan from Geochronological and Isotopic-Geochemical Data on Paleozoic Granitoids,” Geotektonika, No. 5, 26–44 (2001) [Geotectonics 35, 356–372 (2001)].
K. N. Shatagin, K. E. Degtyarev, and O. V. Astrakhantsev, “Strontium and Neodymium Isotopic Composition of Granitoids from the Kokchetav Massif,” Dokl. Akad. Nauk 369, 525–528 (1999) [Dokl. Earth Sci. 369, 1324–1327 (1999)].
J. S. Stacey and I. D. Kramers, “Approximation of Terrestrial Lead Isotope Evolution by a Two-Stage Model,” Earth Planet. Sci. Lett. 26(2), 207–221 (1975).
R. H. Steiger and E. Jager, “Subcomission of Geochronology: Convention of the Use of Decay Constants in Geo-and Cosmochronology,” Earth Planet. Sci. Lett. 36(2), 359–362 (1976).
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Original Russian Text © A.M. Kurchavov, A.B. Kotov, E.B. Sal’nikova, V.P. Kovach, M.D. Tolkachev, Kh.K. Ismailov, M.S. Grankin, F.V. Dolgan’, 2007, published in Petrologiya, 2007, Vol. 15, No. 5, pp. 547–551.
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Kurchavov, A.M., Kotov, A.B., Sal’nikova, E.B. et al. First U-Pb and Sm-Nd isotopic data on granitoids from the Devonian volcanic belt of Kazakhstan. Petrology 15, 509–513 (2007). https://doi.org/10.1134/S0869591107050050
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DOI: https://doi.org/10.1134/S0869591107050050