The Proterozoic Lena-Aldan zone of basaltic protoactivation of the southeastern part of the Siberian platform

s A significant part of the Precambrian basement of the Siberian platform is overlapped by a platform cover of sedimentary rocks of various thickness and is inaccessible for study with direct geological methods. However, intense Proterozoic magmatism, to which the largest mineral deposits on various platforms of the world are related, may be manifested in its separate blocks. In such cases, geological information notably increases owing to application of deep geophysical (seismic, graviand magnetometric, and geoelectric) methods. Using these methods, in the eastern part of the Siberian platform, we identified the Proterozoic Lena-Aldan zone of basaltic protoactivation extended in the northwesterly direction for 1500 km from the Aldan to Anabar shields of the Siberian platform. Ultramafic and mafic intrusive magmatism and kimberlites are widely manifested in this zone. By the character and intensity of magmatism, it is a homologue of the South African province (South African Republic, Namibia, Zimbabwe) with large and giant Pt, Au, Ni, Co, Cr, and other deposits.