1. Middle paleozoic rhyolite of Gorny and Rudny Altai: geochronology and composition characteristics
- Author
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Shogo Aoki, Tsuyoshi Komiya, N. I. Gusev, Y. V. Kuibida, A. V. Naryzhnova, V. I. Krupchatnikov, N. N. Kruk, O. V. Murzin, V. A. Krivchikov, S. P. Shokal’sky, O. M. Popova, Min Sun, S. N. Rudnev, V. I. Timkin, and M.L. Kuibida
- Subjects
geography ,Multidisciplinary ,geography.geographical_feature_category ,Felsic ,Volcano ,Paleozoic ,Rhyolite ,Geochronology ,Geochemistry ,Radiometric dating ,Volcanism ,Geology - Abstract
The paper presents the results of geological, geochemical and isotope-geochronological studies of subvolcanic rhyolites of the Western Gorny Altai and Rudny Altai which have related to two large volcanic systems, the Altai-Minusinsk and Altai-Salair, respectively. The results of U-Pb isotopic dating of zircons revealed two groups of ages ~410-405 and 390-381 million years. Isotope-geochemical characteristics of rhyolites show relatively high values of εNd(T) = +2,7...6,0 with relatively young values of model ages T(DM) = 851-966 Ma in the Rudny Altai and more ancient - up to 1266 Ma in the West Gorny Altai. Geochemical characteristics indicate that its composition is consistent with transitional field between within-plate and island-arc felsic magmas. The results obtained correspond to the two-stage evolution of volcanism and its migration from the continent to the ocean.
- Published
- 2019
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