Middle Paleozoic Rhyolite of the Gorny and Rudny Altai: Geochronology and Composition

Autor:	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, Shogo Aoki
Rok vydání:	2019
Předmět:	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
Zdroj:	Doklady Earth Sciences. 487:885-889
ISSN:	1531-8354 1028-334X
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::08e48cda3e97896ee2ee5c9f5960b5d8 https://doi.org/10.1134/s1028334x19080130 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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