Model of the Deep Structure of the Taragai Area of the Sutar Range, Lesser Khingan

The magnetic and density models were constructed for the Earth’s crust and upper mantle of the Taragai area located in the northeastern part of the Sutar Range (Lesser Khingan). The deep structure of the area is determined by the inclined crust–mantle high-density zone subsiding to the SSE at angle of ∼ 60°. In the Earth’s crust, the area of the elevated density is related to the Proterozoic–Cambrian metamorphic rocks and mafic intrusions of the Birobidzhan complex. The magnetic features of the upper crust are mainly determined by horizons of hematite and magnetite–hematite ores in Vendian–Cambrian rocks. Joint analysis of the density section passing through the Taragai explosion pipe and magnetic petrology data suggest the presence of two magmatic paleochambers: at mantle depths of 40–70 km and at crustal depths of 12–25 km. Paleomagnetic data indicate that the gabbrodolerites of the Birobidzhan complex were formed within a latitude band of ±16°, which likely points to their Paleozoic age.