Abstract:

The surface of eastern Bogda in Xinjiang is heavily covered, and the rock weathering and erosion is serious,so the direct prospecting signs are not obvious. The large-scale geochemical measurement method played a significant role in the discovery and delineation of concealed ore bodies combined with the auxiliary function method of highgradient induced polarization measurement. The quantitative analysis of trace elements in the study area showed that Cu, Zn, Mo and As elements are relatively extra enriched, and Pb, Sn, Co and Ba elements are enriched, and the single element has horizontal zonation. According to the characteristics of elements combination and spatial distribution of geochemical primary halos, it would be delineated four Ⅲ-grade geochemical anomaly areas by the criteria of single-element anomalies’ lower limit and continental crust Clark value. The anomaly evaluation indicates that Cu-Pb-Zn-Mo-As-Sn-Co-Ba-Fe-Ni-Hg multi-element superimposed anomaly form is favorable for prospecting. According to the results of geochemical, geophysical induced polarization and drilling data, the predicting preliminary reveals that the geological mineralization condition of this predicting area is conducive to the formation of pyrite-type copper deposits, and further exploration could be done in the other anomalous areas to prospect small-size copper deposits.

Key words: Bogda, primary halo, IP anomaly, concealed ore body