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First U-Pb and Sm-Nd isotopic data on granitoids from the Devonian volcanic belt of Kazakhstan |
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| Authors: | 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’ |
| Institution: | (1) Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 119017, Russia;(2) Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia;(3) TOO Tsentrgeols”emka, Svobodnyi per. 9, Karaganda, 100019, Kazakhstan |
| 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 (?Nd = 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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