Tectonics of the Verkhoyansk-Kolyma mesozoid system (Eastern Yakutia)
In this paper we propose the model of transformation of the Yakut Marginal Sea (YMS) into the orogenic Verkhoyansk-Kolyma mesozoid system (VKMS). The model is indicated in general terms and is undoubtedly a subject to further research. We have established similarity of the structure and formation of the YMS to the modern Japan marginal sea. In the late Mesozoic the VKMS was formed through the mini-subduction of the YMS oceanic crust beneath the island arc and microcontinent with the closure of small ocean basins, along with the collision of the YMS crustal blocks with Siberian continent. The marginal sea model allows us to claim that the major tectonic structures of the Verkhoyansk-Kolyma and Novosibirsk-Chukotka folded mesozoic systems of the Northeast Russia are in fact structural elements of different cratons: the North Asian and North American cratons. Moreover, formation of the systems occurred on different sides of the convergent boundary of the southern Proto-Arctic. Thus, the collisional (marginal sea) Verkhoyansk-Kolyma border was formed in the rear zone of the border, and the accretionary Novosibirsk-Chukotka border was formed in its frontal part.