The features of the Paleozoic-Mesozoic complexes of Kiber Cape (Chukotka, Arctic Russia): a structural-deforma-tion analysis

Three major regional deformation stages of Central Chukotka tectonic evolution were determined in Paleozoic-Mesozoic deposits of Kiber Cape. The research was based on a structural analysis of the linear and planar elements. Ellesmerian (Late Devonian) structural parageneses were masked during (at least) two phases of young Mesozoic-Cenozoic deformations: syncollisional North-North-East - South-South-West and North-West - South-East regional compressions and post-collisional extension of various directions, followed the compressions. The structural data comparison was made for Kiber Cape region, South-Anyui suture and Western Chukotka sector. It was emphasized that these regional units have similar structure styles and coeval phases of the tectonic transformations.

Structural parageneses of flysch complexes in the central part of the Uralian Foreland basin

In this work we reported the structural characteristics of the late Paleozoic flysch formation in the central part of the Uralian foreland basin. Three types of structural associations specific for thrust zones are established there. These include: 1) asymmetrical to recumbent west-vergent folds; 2) re-structured tectonic melange; 3) local thrusts, zone of schystosity, flat tectonic mirrors. Generally structural elements strike approximately parallel to the regional Karantrav thrust; orientation of striking ranges from the northwest to the northeast, accordingly to tectonic heterogeneity of the allochtone.