Magnetostratigraphy of the Permian–Triassic Boundary in the Lower Reaches of the Vetluga River, Nizhny Novgorod Region, East European Platform

Abstract—We present the results of detailed paleomagnetic studies of six Permian–Triassic boundary sections in the central part of the East European Platform, which are located in the lower reaches of the Vetluga River: Astashikha, Voskresenskoe, Znamenskoe, Prudovka, Sosnovka, and Sukhoborka. The paleomagnetic data, which meet the modern quality standards for laboratory processing, together with the results of biostratigraphic studies, make it possible to develop and substantiate the magnetostratigraphic scales for each section, as well as to correlate them and to compile a composite magnetic polarity scale for the Permian–Triassic sedimentary complex of the Vetluga River. Rock-magnetic characteristics are determined for each of the studied sections, and paleomagnetic poles of the East European Platform are calculated for the Late Permian and Permian–Triassic boundary.