1. Middle Paleozoic Rhyolite of the Gorny and Rudny Altai: Geochronology and Composition
- Author
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V. A. Krivchikov, Tsuyoshi Komiya, V. I. Krupchatnikov, O. V. Murzin, Y. V. Kuibida, V. I. Timkin, N. N. Kruk, Min Sun, S. N. Rudnev, N. I. Gusev, S. P. Shokal’sky, O. M. Popova, A. V. Naryzhnova, M. L. Kuibida, and Shogo Aoki
- Subjects
geography ,geography.geographical_feature_category ,Felsic ,010504 meteorology & atmospheric sciences ,Paleozoic ,Geochemistry ,Volcanism ,010502 geochemistry & geophysics ,01 natural sciences ,Volcano ,Age groups ,Rhyolite ,Geochronology ,Earth and Planetary Sciences (miscellaneous) ,General Earth and Planetary Sciences ,Geology ,0105 earth and related environmental sciences ,Zircon - Abstract
The paper reports the results of geological, geochemical, and isotope–geochronological studies of subvolcanic rhyolites of NW Gorny Altai and Rudny Altai, which belong to the large Hercynian volcanic systems: Altai-Minusa and Altai–Salair, respectively. U–Pb zircon dating revealed two age groups: ~410–405 and 390–381 Ma. The isotope–geochemical characteristics of the rhyolites demonstrate high eNd(Т) from +2.6 to 6.0 with relatively young model ages T(DM) = 851–966 Ma in Rudny Altai and older model ages, up to 1266 Ma, in NW Gorny Altai. The rhyolites show transitional geochemical signatures between within-plate and island-arc felsic magmas. The results obtained are consistent with two-stage evolution of volcanism and its migration from the continent to the ocean.
- Published
- 2019
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