The discovery of the Changtuxili Mn-Ag-Pb-Zn polymetallic deposit in the middle-southern segment of Da Hinggan Mountains and its significance

A Mn, Ag, Pb, Zn polymetallic deposit was discovered in Huolingol area of Inner Mongolia by Tianjin Center of China Geological Survey together with Qiqihar Branch of Heilongjiang Institute of Geological Survey and Research. The tectonic position of the deposit is in the eastern part of the Central Asian Orogenic Belt. The deposit was formed by NW-striking cataclastic alteration in Baiyin-gaolao Formation. Seven parallel NW-striking ore veins are exposed by trenching. There are many kinds of low-temperature hydrothermal alteration in the orebody and wall rock, such as silicification, sericitization, chloritization, limonitization and carbonation. The deposit is probably an epithermal deposit, as shown by different kinds of alteration and the features of controlling role of the NW-striking structure. There probably exists a secondary metallogenic belt which is controlled by the NW-striking structure in the northeast metallogenic belt that is controlled by Pacific tectonic domain in the middle-southern segment of the Da Hinggan Mountains.