Curie Point Depths of the Amur Tectonic Plate

Based on the analysis of the anomaly magnetic field for the Amur Plate and adjacent territories, a Curie Point Depth (CPD) map has been constructed, which we identify with the isotherm 578°C — the temperature of the Curie point of magnetite. Within the Amur plate, the CPD values range from 13.4 to 38.0 km. Three large areas are clearly visible on the map: 1) NE-trending zone with CPD values of 25–20 km — Yellow Sea-Korean Peninsula-Sea of Japan; 2) ENE-trending central zone with CPD values of 30–38 km. Large depth values are due to the presence of the late Paleozoic and Mesozoic sedimentary basins of Erlyan, Songliao and Sredneamursky; 3) ENE-trending central zone with CPD values of 30-38 km. Large depth values are due to the presence of the late Paleozoic and Mesozoic sedimentary basins of Erlyan, Songliao and Sredneamursky. The fourth area of decrease in CPD values spatially coincides with volcanic structures of Pliocene-Pleistocene age in the area of the Toko Stanovik. Comparison of the generated CPD map with the Amur plate boundaries determined mainly from seismic data shows that the surface boundaries of the plate coincide mainly with the zones of the largest gradients of the 578°C isotherm distribution in depth.