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Tectonic Features and Stages of Evolution of the Baltic–Mezen Shear Zone in the Phanerozoic, Northwestern Russia
Geotectonics ( IF 1.1 ) Pub Date : 2020-05-08 , DOI: 10.1134/s0016852120010057
S. Yu. Kolodyazhny , E. N. Terekhov , A. S. Baluev , A. V. Poleshchuk , D. S. Zykov

Abstract

The general tectonic features of the Baltic-Mezen zone developed along the border of the Fennoscandian shield and the Russian Plate in the north of the East European platform, are considered. The geophysical remote methods and structural analysis were used. It has been established that the zone has a length of more than 1000 km with a width of 10–40 km and can be traced from the Gulf of Finland in the sub-latitudinal direction along the southern shores of the Lake Ladoga and the Lake Onega in the valley of the River Onega.The Baltic-Mezen zone is represented by a system of folds and faults, fracture zones and brecciation, complicating the complexes of the Archean–Paleoproterozoic basement and the Vendian–Phanerozoic cover. Throughout the zone, changes in the configuration and displacement of the axes of the magnetic anomalies are noted; on seismic sections, the systems of discontinuities penetrating the basement and cover complexes are decrypted. On the surface, the discontinuous structures of the zone are expressed in the various forms of relief, often violate and displace glacial morphostructures. Based on the analysis of materials on the nature of the paleoseismites distribution and surfaces of unconformity in the sediments of the cover, as well as the structural features of various rock complexes, a long period of development of the Baltic-Mezen zone was established during the Caledonian, Hercynian and the latest stages of deformation. The Caledonian stage was associated with the formation of paleoseismites horizons of Kukruz phase (~ 460 Ma), as well as the folded-fault structures formed in the Late Silurian–Early Devonian. The Hercynian stage was manifested by several seismic and tectonic events in the Late Devonian (Frasnian age), in the Early (Visean age) and Late (Kasimovian century) Carboniferous. The newest stage was associated with Neopleistocene glaciodynamic processes and two stages of seismic events in the late and post-glacial period, which were accompanied by activation of ancient faults and local development of folded structures. The developed scale of paleoseismic and deformation events of the Baltic-Mezen zone can be used for tectono-dynamic reconstructions based on additional analysis of materials of structural-kinematic research.


中文翻译:

俄罗斯西北部多生代的波罗的海-梅曾剪切带的构造特征和演化阶段

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-麦禅地带的总体构造特征。使用了地球物理远程方法和结构分析。已经确定该区域的长度超过1000 km,宽度为10–40 km,可以沿着拉多加湖和奥涅加湖的南岸从子湾经纬度方向追溯到芬兰湾波罗的海-麦岑地带以褶皱和断层,断裂带和断裂带系统为代表,使太古宙古古生代基底和文甸古生代覆盖层复杂。在整个区域中,记录了磁异常轴的配置和位移的变化;在地震剖面上,穿透地下室和覆盖物的不连续系统被解密。在表面上,该区域的不连续结构以浮雕的各种形式表达,经常破坏并置换冰川的形态结构。根据对盖层沉积物中古希腊岩分布的性质和不整合面的材料以及各种岩石复合物的结构特征进行的材料分析,确定了波罗的海-麦曾带的长期发展期。加里东,海西和最新的变形阶段。加里东期与库克鲁兹相(〜460 Ma)的古生界地层的形成,以及晚志留纪-早泥盆世形成的褶皱断层构造有关。海西期在泥盆纪晚期(弗拉西尼亚时代),早期(维森时代)和晚期(卡西莫维世纪)石炭纪发生了几次地震和构造事件。最新阶段与新世新世的冰川动力学过程以及冰川晚期和后冰期的地震事件的两个阶段有关,这些阶段都伴随着古老断层的活化和褶皱结构的局部发育。基于结构运动学研究材料的附加分析,波罗的海-梅岑地区古地震和变形事件的发展规模可用于构造动力重建。最新阶段与新世新世的冰川动力学过程以及冰川晚期和后冰期的地震事件的两个阶段有关,这些阶段都伴随着古老断层的活化和褶皱结构的局部发育。基于结构运动学研究材料的附加分析,波罗的海-梅岑地区古地震和变形事件的发展规模可用于构造动力重建。最新阶段与新世新世的冰川动力学过程以及冰川晚期和后冰期的地震事件的两个阶段有关,这些阶段都伴随着古老断层的活化和褶皱结构的局部发育。基于结构运动学研究材料的附加分析,波罗的海-梅岑地区古地震和变形事件的发展规模可用于构造动力重建。
更新日期:2020-05-08
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