Abstract—The paper presents the results of magnetotelluric soundings conducted in 2018–2019 in the southeastern Ladoga region for studying the deep geoelectric structure of the basement of the East European platform at the junction of the Russian plate with the Fennoscandinavian shield. The results of noise suppression processing of the observations on the 180-km Tikhvin–Vinnitsa profile and the invariant analysis of the obtained magnetotelluric and magnetovariational transfer operators are discussed. A geoelectrical model of the Earth’s crust along the profile down to a depth of 50 km is constructed by two-dimensional inversion. The model clearly reflects the structures of the southeastern segment of the Ladoga crustal conductivity anomaly confined to the extended Ladoga-Bothnian tectonic zone at the boundary of the Archaean (AR) and Proterozoic (PR) domains of the shield. Fundamental features of the similarity between the new 2D model of the Ladoga anomaly and the similar model previously constructed for the Vyborg–Suojärvi profile on the northern coast of Lake Ladoga are revealed: the general southwestward dip of the crustal conductive structures and a significant increase in their integral conductivity at the depths of 15–20 km within the southern segments of the profiles. A preliminary geological interpretation of the constructed resistivity section along the Tikhvin–Vinnitsa line is presented.

中文翻译：

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从大地电磁数据看东南拉多加地区东欧地台基底的电导率

摘要——本文介绍了 2018-2019 年在拉多加地区东南部进行的大地电磁测深结果，用于研究俄罗斯板块与芬诺斯堪的纳维亚地盾交界处东欧地台基底的深层地电结构。讨论了对 180 公里 Tikhvin-Vinnitsa 剖面观测的噪声抑制处理结果以及对所获得的大地电磁和磁变传递算子的不变分析。地壳沿剖面向下至 50 公里深度的地电模型是通过二维反演构建的。该模型清楚地反映了拉多加地壳电导率异常东南段的结构，该异常被限制在地盾太古代 (AR) 和元古代 (PR) 域边界处扩展的拉多加-博斯阶构造带。揭示了拉多加异常新二维模型与先前为拉多加湖北岸维堡-Suojärvi 剖面构建的类似模型之间相似性的基本特征：地壳传导结构总体向西南倾斜，并且它们在剖面南段 15-20 公里深处的整体电导率。介绍了沿 Tikhvin-Vinnitsa 线的已建成电阻率剖面的初步地质解释。揭示了拉多加异常新二维模型与先前为拉多加湖北岸维堡-Suojärvi 剖面构建的相似模型之间的相似性的基本特征：地壳传导结构总体向西南倾斜和显着增加它们在剖面南段 15-20 公里深处的整体电导率。介绍了沿 Tikhvin-Vinnitsa 线的已建成电阻率剖面的初步地质解释。揭示了拉多加异常新二维模型与先前为拉多加湖北部海岸维堡-Suojärvi 剖面构建的类似模型之间的相似性的基本特征：地壳传导结构总体向西南倾斜和显着增加它们在剖面南段 15-20 公里深处的整体电导率。介绍了沿 Tikhvin-Vinnitsa 线的已建成电阻率剖面的初步地质解释。地壳导电结构总体向西南倾斜，并且在剖面南段 15-20 公里深处它们的整体电导率显着增加。介绍了沿 Tikhvin-Vinnitsa 线的已建成电阻率剖面的初步地质解释。地壳导电结构总体向西南倾斜，并且在剖面南段 15-20 公里深处它们的整体电导率显着增加。介绍了沿 Tikhvin-Vinnitsa 线的已建成电阻率剖面的初步地质解释。