Postcollision magmatism of western sector of the Mongol-Okhotsk orogenic belt: oxidation conditions and metallogenic zonality
The Transbaikal sector of the Mongol-Okhotsk orogenic belt displays a well-consistent geochemical and metallogenic zonality. The axial zone of the belt which is controlled by the Mongol-Okhotsk suture zone from the north is composed of the recycled ilmenite-series rocks. Tin, tungsten, and rare metals deposits and occurrences previously distinguished by S.S. Smirnov as a rare metal belt are confined to the ilmenite- series rocks. The recovered rocks are framed from the north and south with oxidized magnetite-series rocks with chalcophile mineralization. The distribution zones of the ilmenite-series rocks correspond to anomalies with low values of gravity and magnetic fields, whereas the oxidized rocks of the magnetite-series correspond to the anomalies with increased values of gravity and magnetic fields.