Доклады Академии наукДоклады Академии наук0869-5652The Russian Academy of Sciences1570610.31857/S0869-56524873293-298Research ArticleSources of eocene magmatism of Western Kamchatka (according to geochemical and isotope Sr-Nd-Pb characteristics of basites)FedorovP. I.pi_fedorov@mail.ruPerepelovA. B.pi_fedorov@mail.ruKovalenkoD. V.pi_fedorov@mail.ruDrilS. I.pi_fedorov@mail.ruLobanovK. V.<p>Corresponding Member of the Russian Academy of Sciences</p>pi_fedorov@mail.ruGeological Institute of the Russian Academy of SciencesVinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of SciencesInstitute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences1708201948732932981408201914082019Copyright © 2019, Russian academy of sciences2019<p class="a"><span lang="EN-US">The isotope-geochemical characteristics of the Eocene-Oligocene magmatic rocks of Western Kamchatka were studied. It is shown that the igneous rocks of the Eocene (45-53 Ma) Kinkil complex of Western Kamchatka are characterized by geochemical signs of super-subduction volcanism. Their isotopic composition of Sr, Nd and Pb, low concentrations of HFSE and HREE relative to the composition of MORB, suggest the formation of primary melts from depleted or poorly enriched in isotopic composition of the mantle wedge sources in different contaminated quartz-feldspath sialic sediments. From the end of the Middle Eocene on the territory of Western Kamchatka, K-Na alkaline-basalt magmatism (46-31 million years), whose geochemical characteristics are similar to E-MORB, as well as ultrapotassic alkaline-basalt magmatism, which continued to develop to the early Miocene (35-17 million years). The geodynamic nature of Late Paleogene alkaline magmatism involves the implementation of processes of diffuse rifting.</span></p>volcanismactive continental marginEoceneWestern Kamchatkaвулканизмактивная континентальная окраинаэоценЗападная Камчатка[Ханчук А. И., Иванов В. В. // Геология и геофизика. 1999. Т. 40. № 11. С. 1635-1645.][Перепелов А. Б. Кайнозойский магматизм Камчатки на этапах смены геодинамических обстановок: Дис. д-ра геол.-минерал. наук. Иркутск: Ин-т геохимии им. А. П. Виноградова СО РАН, 2014. 361 с.][Федоров П. И., Коваленко Д. В., Агеева О. А. // Геохимия. 2011. № 8. С. 813-838.][Федоров П. И., Коваленко Д. В., Баянова Т. Б., Серов П. А. // Петрология. 2008. Т. 16. № 3. С. 277-295.][Перепелов А. Б., Иванов А. В. В кн.: Геодинамика, магматизм и металлогения Востока России. Владивосток: Дальнаука, 2006. С. 369-382.][Чехович В. Д., Сухов А. Н. В сб.: Западная Камчатка: геологическое развитие в мезозое. М.: Науч. мир, 2005. С. 195-220.][Федоров П. И., Филатова Н. И. // Геохимия. 1999. № 2. С. 115-132.][Леднева Г. В., Носова А. А., Соловьев А. В. // Петрология. 2006. Т. 14. № 2. С. 168-202.][Богданов Н. А., Чехович В. Д. // Геотектоника. 2002. № 1. С. 72-85.][Sun S. S., McDonough W. F. // Geol. Soc. London. Spec. Publ. 1989. V. 42. P. 313-345.][Zindler A., Hart S. // Ann. Rev. Earth Planet. Sci. 1986. V. 14. P. 493-571.]