Тип публикации: статья из журнала

Год издания: 2014

Идентификатор DOI: 10.1134/S1028334X14080042

Ключевые слова: Geochronology, Rocks, Silicate minerals, Tectonics, Volcanoes, Early Paleozoic, Fold belts, Gabbroic rocks, Geochemical features, Island arc, Oblique collision, Suprasubduction, Volcanosedimentary rocks, Volcanic rocks, Decapoda (Crustacea)

Аннотация: The volcanic (basaltic, basalt andesitic, andesitic, and rhyolitic) porphyric rocks of the Tsagan-Zaba complex are studied in the Olkhon composite terrane of the Central Asian foldbelt. The concordant U-Pb (SHRIMP-II) age of single zircon grains from rhyolites (492 ± 5 Ma) may be interpreted as the period of formation of the TsaganПоказать полностью-Zaba complex. The volcanic rocks of this complex are characterized by clear suprasubduction geochemical features and positive ?Nd(t) values. The similar ages, compositions, and ?Nd(t) values of the studied volcanic rocks and gabbroic rocks of the Birkhin pluton allow us to combine them into a common Birkhin volcano-plutonic association, which may be considered as a fragment of a section of the mature island arc of ?500 Ma in age. The gabbroic rocks may be interpreted as the middle part of this section, whereas the volcanic and volcanosedimentary rocks belong to its upper part. The section was disintegrated 470–460 Ma ago, when the Early Paleozoic island arc was accreted to the southern flank of the Siberian craton in the course of the oblique collision and became a part of the Olkhon composite terrane. © 2014, Pleiades Publishing, Ltd.

Журнал: Doklady Earth Sciences

Выпуск журнала: Vol. 457, Is. 2

Номера страниц: 905-909

• Gladkochub D.P. (Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, Russian Federation)
• Donskaya T.V. (Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, Russian Federation)
• Fedorovskii V.S. (Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, Russian Federation)
• Mazukabzov A.M. (Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, Russian Federation)
• Sklyarov E.V. (Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, Russian Federation, Far East Federal University, ul. Sukhanova 8, Vladivostok, Russian Federation)
• Lavrenchuk A.V. (Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Koptyuga 3, Novosibirsk, Russian Federation)
• Lepekhina E.N. (Karpinskii All-Russia Scientific-Research Geological Institute (VSEGEI), Srednii pr. 74, St. Petersburg, Russian Federation)

• Scopus