Abstract:

Based on 1/200 000 geochemical exploration data of northern Chifeng area and the theory  of geochemical blocks，the authors have studied the characteristics of Pb geochemical block and Pb mineral resources, and identified two Pb geochemical blocks and six relatively small geochemical anomaly areas. Through analyzing the controlling factors of Pb geochemical blocks, the authors suggest that the contacting zone or outer contacting zone of Yanshanian intermediate-felsic intrusive rocks are the favorable locations for the blocks, and the Permian Huanggangliang and Dashizhai Formation, Jurassic Manitu and Xinmin Formation, and Upper Silurian Xingshuwa Formation are considered as the main strata for those blocks. The size of blocks is obviously controlled by NW-and NE-striking faults. By taking 1 000 m as the criterion, the total predicted mineral resource of Pb is 18.935 3 million tons in the study area. The study area was subdivided into nine Pb prospect areas, and three of them (No.1113-1, No.1411-1 and No.3111-1) are first-order areas.

Key words: geochemical block, lead, mineral resources, northern Chifeng area