Abstract

The tectonic features of the Baltic–Mezen shear zone that developed along the border of the Fennoscandian Shield and the Russian Plate in the north of the East European Platform are considered. It is established that tectonic evolution of the considered zone was associated with strike-slip displacements in the basement rocks, which occurred and were dispersed in cover deposits in the form of low-amplitude faults and diagonal fold-and-thrust systems associated with sublayer detachments. The dynamic relationship of the geological–structural and geomorphic anomalies of the Baltic–Mezen zone with segments of bending of its mainline and virgation, as well as with the nodes of intersection of the main shear zone with transverse faults, is noted. Based on a study of structural and kinematic parageneses, it has been established that the Baltic–Mezen shear zone in the Phanerozoic developed mainly under dextral strike-slip displacement and transpression conditions during eight activation phases of the Caledonian, Hercynian, and recent deformation stages. Periodically there was a change in deformation regimes and kinematic inversions, and a shear zone evolved in conditions of transtension and sinistral strike-slip displacements. The kinematics of the Baltic–Mezen shear zone is consistent with the general dynamic patterns of the evolution of the East European Platform, in particular, with the formation of collision structures of the Scandinavian Caledonides, with extensive Late Devonian tectonic–magmatic events and features of the recent development of the Euro–Arctic region.

中文翻译：

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东欧平台西北部杂多生代的波罗的海-梅曾剪切带的结构运动学共生和动力学演化模型

摘要

考虑了在东欧平台北部沿芬诺斯坎迪亚盾和俄罗斯板块边界发展的波罗的海-梅岑剪切带的构造特征。已确定，该地区的构造演化与基底岩石中的走滑位移有关，走滑位移发生并以低振幅断层和对角褶皱-冲断系统的形式散布在覆盖沉积物中，并与亚层脱离相关。 。记录了波罗的海-梅曾地带的地质，构造和地貌异常与主干和变绿的弯曲段之间的动态关系，以及主剪切带与横向断层相交的节点。基于对结构和运动学上的同源性的研究，已经确定，在加里东期，海西期和最近的变形阶段的八个激活阶段中，生代时代的波罗的海-梅岑剪切带主要在右旋走滑位移和压转条件下发展。变形状态和运动学反演周期性地发生变化，并且在超张和左弦走滑位移的条件下，剪切带也发生了变化。波罗的海-梅曾剪切带的运动学与东欧平台演化的一般动力学模式相一致，特别是与斯堪的纳维亚喀里多尼德斯碰撞构造的形成，泥盆纪晚期的构造-岩浆事件和特征有关。欧洲北极地区的最新发展。