Abstract

The original and published geochronological data and the geological position of different granitoid complexes of the Main (Kolyma) Batholith Belt of Northeast Asia have been generalized. It was proved that the belt was formed in two stages. The first Late Jurassic stage of magma generation of granitoids of the Kolyma complex resulted from the collision of island arc and cratonic terranes. This stage was ended with amalgamation of the Kolyma–Omolon superterrane (microcontinent), which is reflected in the U–Pb dating of zircons from granitoids (155–147 Ma). The second, main, stage of the collision of the Siberian continent and the Kolyma–Omolon microcontinent occurred at the boundary between the Jurassic and the Cretaceous. During this stage, intrusions of the Kolyma complex were developed at the upper horizons of the crust, which was proved by the Ar–Ar age estimation (146–133 Ma). The melting out of granitoids of the Nel’kan, Baky-Derbekin, Sakhan’ya, and Omchikandya complexes of the Main Belt with the Early Cretaceous dating for zircon (145–130 Ma) is related to this stage.

中文翻译：

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俄罗斯东北部主要巴托利特带的形成阶段：U-Th-Pb SIMS 和 Ar-Ar 年代学数据

摘要

对东北亚主要（科雷马）基岩带原始和已发表的年代学资料和不同花岗岩杂岩体的地质位置进行了概括。经证明，该带分两个阶段形成。科雷马杂岩体花岗岩类晚侏罗世第一阶段岩浆生成是岛弧与克拉通地体碰撞的结果。这一阶段以 Kolyma-Omolon 超级地体（微大陆）的合并结束，这反映在花岗岩类锆石（155-147 Ma）的 U-Pb 年代测定中。西伯利亚大陆与科雷马-奥莫隆微大陆碰撞的第二个主要阶段发生在侏罗纪和白垩纪的交界处。在这一阶段，科雷马杂岩的侵入体在地壳上层发育，这由 Ar-Ar 年龄估计（146-133 Ma）证明。早白垩世锆石定年（145-130 Ma）主带的Nel'kan、Baky-Derbekin、Sakhan'ya和Omchikandya杂岩的花岗岩熔融与这一阶段有关。