Structural evolution of Mesozoic complexes in Western Chukotka

摘要

Detailed structural investigations were carried out in the Pevek area in order to verify the tectonic evolution of the Mesozoic thrust and fold belt in Chukotka. South-vergent F-1 folds in Triassic rocks were proved to be the earliest structures formed during the first deformation stage DI. These structures were deformed by north-vergent folds F-2 that were formed during the second deformation stage DII. North-vergent folds are the main structures of the Jurassic-Lower Cretaceous complex. The fold structures of the first two stages are deformed by shear folds F-3 finishing the stage DII. All these structures are deformed by submeridionally trending normal faults referred to the deformation stage DIII.