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U-Pb and 39Ar/40Ar dating and Sm-Nd and Pb-Pb isotopic study of the Kalguty molybdenum-tungsten ore-magmatic system, Southern Altai

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Abstract

The Kalguty ore-magmatic system comprises two intrusive complexes: the Kalguty granite-leucogranite complex and Eastern Kalguty complex of dikes and small intrusions. U-Pb dating of individual zircon grains from granites of the main intrusive phase demonstrated that the crystallization age of small grains of magmatic habits and outer rims of large grains is almost concordant and is 216 ± 3 Ma. Ar-Ar isotope study shows that the K-Ar system of biotites from granites of the main phase within the Kalguty ore field was disturbed (radiogenic Ar was partially lost) and gave an age of 202 ± 1 Ma. The Ar-Ar dating of muscovites from intraore and postore dikes of the Eastern Kalguty complex devoid of signatures of postmagmatic recrystallization and superimposed greisenization gave similar ages of 205–201 Ma. This date is considered as the emplacement age of the Eastern Kalguty dikes and associated complex W-Mo-Bi-Be ore mineralization. Sm-Nd and Pb-Pb isotopic study of granites, ongonites, and elvans of the Kalguty ore-magmatic system and host rocks shows that these systems were closed. For example, recalculation of Nd isotopic ratios for corresponding ages of crystallization of magmatic systems (216 and 205 Ma) shows that ɛNd(T) values decrease from −1.9 to −3.5 ... −5.08 with transition from granite-leucogranite to subvolcanic granite porphyry, ongonite, and elvan dikes with corresponding increase of model ages of protoliths from 1.0 to 1.25 Ga. Lead isotopic ratios for leaching residues of whole-rock samples of all rock varieties (206Pb/204Pb = 18.305–18.831; 207Pb/204Pb = 15.527–15.571) are plotted well below the line of average crustal lead evolution according to the Stacey-Kramers model.

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Authors and Affiliations

  1. Institute of Geology, Siberian Division, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia

    I. Yu. Annikova, A. G. Vladimirov, S. A. Vystavnoi, N. N. Kruk, E. N. Moroz & S. N. Rudnev

  2. Institute of Mineralogy, Geochemistry, and Crystal Chemistry of Rare Elements, ul. Veresaeva 15, Moscow, 121357, Russia

    D. Z. Zhuravlev

  3. Karpinskii All-Russia Research Institute of Geology (VSEGEI), Srednii pr. 74, St. Petersburg, 199106, Russia

    E. N. Lepekhina, D. I. Matukov & S. A. Sergeev

  4. Analytical Center, United Institute of Geology, Geophysics, and Mineralogy, Siberian Division, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia

    S. V. Palesskii & V. A. Ponomarchuk

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  1. I. Yu. Annikova
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Original Russion Text © I.Yu. Annikova, A. G. Vladmimicrov, S.A. Vystavnoi, D.Z. Zhuravlev, N.N. Kruk, E.N. Lepekhina, D.I. Matukov, E.N. Moroz, S. V. Palesskii, V.A. Ponomarchuk, S.N. Rudnev, S.A. Sergeev, 2006, published in Petrologiya, 2006, Vol. 14, No. 1, pp. 90–108.

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Annikova, I.Y., Vladimirov, A.G., Vystavnoi, S.A. et al. U-Pb and 39Ar/40Ar dating and Sm-Nd and Pb-Pb isotopic study of the Kalguty molybdenum-tungsten ore-magmatic system, Southern Altai. Petrology 14, 81–97 (2006). https://doi.org/10.1134/S0869591106010073

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