СОСТАВ И ГЕОДИНАМИЧЕСКИЕ ОБСТАНОВКИ ФОРМИРОВАНИЯ ВУЛКАНИЧЕСКИХ ОБРАЗОВАНИЙ ОФИОЛИТОВ УСТЬ-БЕЛЬСКИХ ГОР (ЧУКОТКА)статья
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 14 августа 2017 г.
Аннотация:Abstract—In addition to ophiolites in the structure of the Otrozhnaya sheet, the igneous rocks were estab
lished within the Middle Devonian–Lower Carboniferous tuffaceous–terrigenous complex earlier consid
ered to be the cover of the ophiolite association. In order to establish their geodynamic formation setting, the
geochemical study of igneous rocks was conducted. The volcanic rocks from the ophiolite complex are similar
to MORB; subvolcanic rocks of tuffaceous–terrigenous complex have a suprasubduction origin. An abun
dance of pyroclastic rocks and the type of sediments allow us to conclude about their formation in an island
arc setting. The existence of the Middle Devonian–Lower Carboniferous island arc complex within the Ust’
Belaya Mountains gives rise to continue the Koni–Taigonos arc inside the region and testifies to its subsis
tence in the Devonian.